Climate and average weather in Superior
In Superior, the summers are warm, showery, and partly cloudy and the winters are frigid, snowy, and partly cloudy.
Over the course of the year, the temperature in Superior typically varies from 8°F to 73°F, and is rarely below -11°F or above 82°F. August is the hottest month of the year, while January is the coldest.
Based on the travel score, the best time of year to visit Superior for warm-weather activities is from mid June to late September.
- Hottest
- Aug
- 73°
- Coldest
- Jan
- 8°
- Wettest
- Jun
- 4.1 in
- Driest
- Jan
- 1.0 in
- Rain / yr
- 35.2 in
- 112 wet days
- Daylight
- 8.3–15.7 h
- shortest–longest
- Elevation
- 643 ft
- 46.7°N
- Clearest
- Jul
- 52% cloud
Superior is city in and county seat of Douglas County, Wisconsin, United States.
- Density
- 185/km²
- people per km²
- Founded
- 1854
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Superior weather by month, at a glance
The whole year in one picture — sky, rain, humidity, temperature and travel score. Click any band to jump to its full chart.
Each stripe is one measure across the whole year, stacked so a single day reads top to bottom. The sky band runs overcast grey on top down to clear blue at the base — more blue means sunnier — followed by the rainfall curve, the humidity band, a temperature strip that tints each stretch of the year by how warm its average high is, and the travel-score line at the foot. Scan straight down any date to read that day across every measure at once; the score climbs highest around mid June to late September.
Temperature through the year
Daily average highs and lows in Superior, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 3.9 months, from June 4 to September 29, with daily high temperatures above 60°F. The hottest month of the year in Superior is August, with an average high of 73°F and low of 64°F.
The cool season lasts 3.1 months, from December 6 to March 10, with daily high temperatures below 29°F. The coldest month of the year in Superior is January, with an average low of 8°F and high of 19°F.
Days typically run about 10°F warmer than nights year-round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 19 | 22 | 31 | 41 | 53 | 65 | 73 | 73 | 66 | 52 | 38 | 26 |
| Avg low (°F) | 8 | 10 | 20 | 31 | 42 | 55 | 64 | 64 | 56 | 44 | 30 | 17 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| Jan | 19 | 8 |
| Feb | 22 | 10 |
| Mar | 31 | 20 |
| Apr | 41 | 31 |
| May | 53 | 42 |
| Jun | 65 | 55 |
| Jul | 73 | 64 |
| Aug | 73 | 64 |
| Sep | 66 | 56 |
| Oct | 52 | 44 |
| Nov | 38 | 30 |
| Dec | 26 | 17 |
How hot and cold Superior really feels
The felt-temperature range through the year — heat index on the day's high (summer humidity), wind chill on the night's low (winter wind). The dashed lines are the plain thermometer; the gap is how much hotter or colder it really feels.
On the coldest nights, wind chill pulls the feels-like down to about -8°F (around January 19), with roughly 193 freezing days a year (feels-like at or below 32°F) — 118 of them bitterly cold — worst in January.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°F) | 19 | 22 | 31 | 41 | 53 | 65 | 73 | 73 | 66 | 52 | 38 | 26 |
| Air high (°F) | 19 | 22 | 31 | 41 | 53 | 65 | 73 | 73 | 66 | 52 | 38 | 26 |
| Feels-like low (°F) | -7 | -3 | 10 | 22 | 37 | 55 | 63 | 64 | 56 | 38 | 20 | 3 |
| Air low (°F) | 8 | 10 | 20 | 31 | 42 | 55 | 64 | 64 | 56 | 44 | 30 | 17 |
| Feels-like high (°F) | Air high (°F) | Feels-like low (°F) | Air low (°F) | |
|---|---|---|---|---|
| Jan | 19 | 19 | -7 | 8 |
| Feb | 22 | 22 | -3 | 10 |
| Mar | 31 | 31 | 10 | 20 |
| Apr | 41 | 41 | 22 | 31 |
| May | 53 | 53 | 37 | 42 |
| Jun | 65 | 65 | 55 | 55 |
| Jul | 73 | 73 | 63 | 64 |
| Aug | 73 | 73 | 64 | 64 |
| Sep | 66 | 66 | 56 | 56 |
| Oct | 52 | 52 | 38 | 44 |
| Nov | 38 | 38 | 20 | 30 |
| Dec | 26 | 26 | 3 | 17 |
Average hourly temperature in Superior
A compact picture of the whole year, hour by hour: each column is a day, each row an hour, and the color is the modeled average temperature. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
Read left to right for the day of the year and top to bottom for the hour of the day; the color is the modeled temperature, cool blues through to hot reds on the same scale as the other charts. A vertical slice is a single day's swing — coolest just before dawn, warmest in the mid-afternoon — while a horizontal slice follows one hour across the seasons. The darker overlay marks night and the lighter one the twilight around sunrise and sunset. Colors run warmest on August afternoons, near 73°F, and coldest before dawn in January, near 8°F.
Superior weather by month
Every month at a glance. Click a month for its detailed page.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 19° / 8° | 1.0 | 6.3 | 6.9 | 8.8 | 0.0 |
| Feb | 22° / 10° | 1.1 | 5.3 | 5.6 | 10 | 0.0 |
| Mar | 31° / 20° | 1.9 | 7.3 | 5.1 | 11.6 | 0.0 |
| Apr | 41° / 31° | 3.3 | 10.2 | 4.2 | 13.3 | 0.4 |
| May | 53° / 42° | 3.8 | 11.1 | 0.5 | 14.8 | 2.9 |
| Jun | 65° / 55° | 4.1 | 11.6 | 0 | 15.6 | 5.5 |
| Jul | 73° / 64° | 3.9 | 11.7 | 0 | 15.3 | 6.7 |
| Aug | 73° / 64° | 4.0 | 10.5 | 0 | 14 | 6.9 |
| Sep | 66° / 56° | 3.6 | 10.7 | 0 | 12.4 | 5.9 |
| Oct | 52° / 44° | 4.1 | 10.8 | 0.8 | 10.6 | 2.8 |
| Nov | 38° / 30° | 2.6 | 8.9 | 5 | 9.2 | 0.1 |
| Dec | 26° / 17° | 1.8 | 7.4 | 7.8 | 8.4 | 0.0 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Superior gets about 35.2 in of precipitation a year. On a typical day the chance of rain is often wet, but that rises and falls sharply with the seasons.
The wetter season lasts 7.1 months, from around Mar 31 to Nov 1, peaking in June at about 41% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Feb 5.
June is the wettest month by volume, with 4.1 in over about 12 wet days; January is the driest, with 1.0 in. Some of the cold-season precipitation falls as snow.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 21 | 19 | 24 | 33 | 36 | 39 | 38 | 34 | 35 | 35 | 29 | 24 |
| Rain days | 6 | 5 | 7 | 10 | 11 | 12 | 12 | 11 | 11 | 11 | 9 | 7 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 21 | 6 |
| Feb | 19 | 5 |
| Mar | 24 | 7 |
| Apr | 33 | 10 |
| May | 36 | 11 |
| Jun | 39 | 12 |
| Jul | 38 | 12 |
| Aug | 34 | 11 |
| Sep | 35 | 11 |
| Oct | 35 | 11 |
| Nov | 29 | 9 |
| Dec | 24 | 7 |
Monthly rainfall
Over a full year, Superior collects about 35.2 in of rain across 112 wet days — roughly 2.9 in in an average month.
It doesn’t fall evenly. June is the wettest month with 4.1 in, while January is the driest at just 1.0 in. The three wettest months alone bring about 35% of the year’s total, and some of the cold-season precipitation falls as snow.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (in) | 1.0 | 1.1 | 1.9 | 3.3 | 3.8 | 4.1 | 3.9 | 4.0 | 3.6 | 4.1 | 2.6 | 1.8 |
| Rain days | 6 | 5 | 7 | 10 | 11 | 12 | 12 | 11 | 11 | 11 | 9 | 7 |
| Snow days | 7 | 6 | 5 | 4 | 1 | 0 | 0 | 0 | 0 | 1 | 5 | 8 |
| Rainfall (in) | Rain days | Snow days | |
|---|---|---|---|
| Jan | 1.0 | 6 | 7 |
| Feb | 1.1 | 5 | 6 |
| Mar | 1.9 | 7 | 5 |
| Apr | 3.3 | 10 | 4 |
| May | 3.8 | 11 | 1 |
| Jun | 4.1 | 12 | 0 |
| Jul | 3.9 | 12 | 0 |
| Aug | 4.0 | 11 | 0 |
| Sep | 3.6 | 11 | 0 |
| Oct | 4.1 | 11 | 1 |
| Nov | 2.6 | 9 | 5 |
| Dec | 1.8 | 7 | 8 |
Snow in Superior
Average snowy days through the year, the snow-season span, and estimated snowfall — for ski trips and the perennial 'will there be snow at Christmas?' question.
Superior averages about 36 snowy days a year. Snow season runs roughly Oct 11 to May 14 — about 7.1 months.
December is snowiest, with roughly 7 days of snow and an estimated 13 in of snowfall. Over the year that adds up to an estimated 64 in of snow.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snow days | 7 | 6 | 5 | 4 | 1 | 0 | 0 | 0 | 0 | 1 | 5 | 8 |
| Snowfall (in) | 11 | 10 | 9 | 10 | 1 | 0 | 0 | 0 | 0 | 1 | 9 | 13 |
| Snow days | Snowfall (in) | |
|---|---|---|
| Jan | 7 | 11 |
| Feb | 6 | 10 |
| Mar | 5 | 9 |
| Apr | 4 | 10 |
| May | 1 | 1 |
| Jun | 0 | 0 |
| Jul | 0 | 0 |
| Aug | 0 | 0 |
| Sep | 0 | 0 |
| Oct | 1 | 1 |
| Nov | 5 | 9 |
| Dec | 8 | 13 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Superior, the average share of the sky covered by clouds shows significant seasonal variation over the course of the year.
The clearer part of the year begins around May 22 and lasts for 4.7 months, ending around October 11. The clearest month is July, when the sky is clear, mostly clear, or partly cloudy 59% of the time on average.
The cloudier part of the year begins around October 12 and lasts for 7.3 months, ending around May 21. The cloudiest month is November, when it is overcast or mostly cloudy 73% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 34 | 37 | 40 | 39 | 41 | 46 | 59 | 58 | 51 | 39 | 27 | 27 |
| Cloudier (%) | 66 | 63 | 60 | 61 | 59 | 54 | 41 | 42 | 49 | 61 | 73 | 73 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 34 | 66 |
| Feb | 37 | 63 |
| Mar | 40 | 60 |
| Apr | 39 | 61 |
| May | 41 | 59 |
| Jun | 46 | 54 |
| Jul | 59 | 41 |
| Aug | 58 | 42 |
| Sep | 51 | 49 |
| Oct | 39 | 61 |
| Nov | 27 | 73 |
| Dec | 27 | 73 |
Daylight, sunrise and sunset
Hours of daylight through the year, with sunrise and sunset times.
The gold band is daylight — sunrise runs along its lower edge, sunset along the upper — so it widens toward summer and pinches toward winter, with night the dark area above and below. The longest day, around June 20, brings about 15 h 42 min of light; the shortest, around December 20, only 8 h 18 min — a swing of roughly 7 h 24 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 8.8 | 10.0 | 11.6 | 13.3 | 14.8 | 15.6 | 15.3 | 14.0 | 12.4 | 10.6 | 9.2 | 8.4 |
| Sunrise (AM) | 7:56 | 7:23 | 6:30 | 5:28 | 4:40 | 4:20 | 4:35 | 5:12 | 5:53 | 6:34 | 7:20 | 7:54 |
| Sunset (PM) | 4:40 | 5:23 | 6:06 | 6:49 | 7:29 | 7:57 | 7:53 | 7:13 | 6:13 | 5:12 | 4:27 | 4:16 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 8.8 | 7:56 | 4:40 |
| Feb | 10.0 | 7:23 | 5:23 |
| Mar | 11.6 | 6:30 | 6:06 |
| Apr | 13.3 | 5:28 | 6:49 |
| May | 14.8 | 4:40 | 7:29 |
| Jun | 15.6 | 4:20 | 7:57 |
| Jul | 15.3 | 4:35 | 7:53 |
| Aug | 14.0 | 5:12 | 7:13 |
| Sep | 12.4 | 5:53 | 6:13 |
| Oct | 10.6 | 6:34 | 5:12 |
| Nov | 9.2 | 7:20 | 4:27 |
| Dec | 8.4 | 7:54 | 4:16 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Superior averages about 8 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 4 and 12 days.
The sunnier stretch runs 4.0 months, from around Jun 6 to Oct 6. The sunniest month is July, with roughly 12 sunny days (mixed).
The greyest month is November, down near 5 sunny days — about 54% fewer than the July peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 7 | 7 | 8 | 8 | 8 | 9 | 12 | 12 | 10 | 7 | 5 | 6 |
| Sky | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Mixed | Mixed | Mixed | Mixed | Gloomy | Gloomy | Gloomy |
| Sunny days | Sky | |
|---|---|---|
| Jan | 7 | Gloomy |
| Feb | 7 | Gloomy |
| Mar | 8 | Gloomy |
| Apr | 8 | Gloomy |
| May | 8 | Gloomy |
| Jun | 9 | Mixed |
| Jul | 12 | Mixed |
| Aug | 12 | Mixed |
| Sep | 10 | Mixed |
| Oct | 7 | Gloomy |
| Nov | 5 | Gloomy |
| Dec | 6 | Gloomy |
Humidity comfort
Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.
Humidity comfort is graded by the dew point — the temperature at which the air would be fully saturated — because it tracks how muggy it actually feels far better than relative humidity does. A low dew point feels dry and crisp; a high one feels sticky and oppressive no matter the reading on a humidity gauge.
In Superior, how humid it feels changes dramatically over the year.
The more humid part of the year lasts 3.3 months, from around June 14 to September 21. The muggiest month is July, when the air feels humid, muggy or worse about 50% of the time.
The most comfortable stretch runs from around September 22 to June 13, and May is the most comfortable month — the air is dry or comfortable 100% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 97 | 61 | 20 | 24 | 62 | 96 | 100 | 100 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 2 | 22 | 30 | 27 | 19 | 3 | 0 | 0 |
| Humid (%) | 0 | 0 | 0 | 0 | 0 | 13 | 31 | 32 | 13 | 1 | 0 | 0 |
| Muggy (%) | 0 | 0 | 0 | 0 | 0 | 3 | 15 | 14 | 6 | 0 | 0 | 0 |
| Oppressive (%) | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 3 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| Jan | 100 | 0 | 0 | 0 | 0 |
| Feb | 100 | 0 | 0 | 0 | 0 |
| Mar | 100 | 0 | 0 | 0 | 0 |
| Apr | 100 | 0 | 0 | 0 | 0 |
| May | 97 | 2 | 0 | 0 | 0 |
| Jun | 61 | 22 | 13 | 3 | 0 |
| Jul | 20 | 30 | 31 | 15 | 4 |
| Aug | 24 | 27 | 32 | 14 | 3 |
| Sep | 62 | 19 | 13 | 6 | 0 |
| Oct | 96 | 3 | 1 | 0 | 0 |
| Nov | 100 | 0 | 0 | 0 | 0 |
| Dec | 100 | 0 | 0 | 0 | 0 |
Wind
Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.
This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.
Across the year, average wind speed in Superior is typically light breeze, near 10 mph, and varies moderately with the seasons.
The windier part of the year lasts 4.5 months, from around Sep 5 to Jan 20. The windiest month is November, averaging about 12 mph (breezy).
The calmer part of the year runs from around Jan 21 to Sep 4, with July the calmest month at about 9 mph.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 11 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 11 | 12 | 12 | 12 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | breezy | light breeze |
| Wind speed (mph) | Feels | |
|---|---|---|
| Jan | 11 | light breeze |
| Feb | 10 | light breeze |
| Mar | 10 | light breeze |
| Apr | 10 | light breeze |
| May | 10 | light breeze |
| Jun | 9 | light breeze |
| Jul | 9 | light breeze |
| Aug | 9 | light breeze |
| Sep | 11 | light breeze |
| Oct | 12 | light breeze |
| Nov | 12 | breezy |
| Dec | 12 | light breeze |
Best time to visit Superior
To characterize how pleasant the weather is in Superior throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around mid September, Superior is still near the tail of its best-weather window — great conditions with the peak-season crowds already thinning.
Inferred from the travel-score curve; month-by-month visitor numbers are a planned addition.
The travel score favors clear, rainless days with daytime highs between 64°F and 82°F. Based on this score, the best time of year to visit Superior for general outdoor tourist activities is from mid June to late September, with a peak score in the first week of August.
The travel score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Travel score (0–10) | 0.0 | 0.0 | 0.0 | 0.4 | 2.9 | 5.5 | 6.7 | 6.9 | 5.9 | 2.8 | 0.2 | 0.0 |
| Rating | poor | poor | poor | poor | poor | fair | good | good | good | poor | poor | poor |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 0.0 | poor |
| Feb | 0.0 | poor |
| Mar | 0.0 | poor |
| Apr | 0.4 | poor |
| May | 2.9 | poor |
| Jun | 5.5 | fair |
| Jul | 6.7 | good |
| Aug | 6.9 | good |
| Sep | 5.9 | good |
| Oct | 2.8 | poor |
| Nov | 0.2 | poor |
| Dec | 0.0 | poor |
The beach/pool score favors clear, rainless days with daytime highs between 75°F and 93°F. Based on this score, the best time of year to visit Superior for hot-weather activities is from early July to early September, with a peak score in the first week of August.
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
What to pack for Superior, by month
Month by month, what's worth putting in the bag — from the temperature range, rain chance, sun and wind. Tap a month for a quick packing note.
For a warm-season trip around August (highs near 73°F), the essentials are light clothes, rain gear and sun protection. In the cold season around January (highs near 19°F), pack a warm layer and a heavy coat.
In August, Superior sees daytime highs around 73°F and nights near 64°F. Worth packing: light clothes, rain gear and sun protection. About 11 days see rain.
Sea temperature near Superior
Average ocean temperature at the nearest coast, month by month, banded into swim-comfort zones — the other half of the beach question.
The sea at the nearest coast (about 12 mi away) is warmest in August at about 63°F and coldest in February near 34°F.
The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 36 | 34 | 34 | 36 | 38 | 44 | 55 | 63 | 58 | 50 | 43 | 38 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 36 | Bracing |
| Feb | 34 | Bracing |
| Mar | 34 | Bracing |
| Apr | 36 | Bracing |
| May | 38 | Bracing |
| Jun | 44 | Bracing |
| Jul | 55 | Bracing |
| Aug | 63 | Cool |
| Sep | 58 | Bracing |
| Oct | 50 | Bracing |
| Nov | 43 | Bracing |
| Dec | 38 | Bracing |
UV index (midday) in Superior by month
Clear-sky midday UV index through the year, shaded by the WHO exposure levels — how much sun protection each month calls for.
Under clear skies, the midday UV index in Superior peaks around June 17 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 11 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 3 | 5 | 6 | 8 | 7 | 7 | 5 | 3 | 2 | 1 |
| Level | Low | Low | Moderate | Moderate | High | Very high | High | High | High | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Low |
| Mar | 3 | Moderate |
| Apr | 5 | Moderate |
| May | 6 | High |
| Jun | 8 | Very high |
| Jul | 7 | High |
| Aug | 7 | High |
| Sep | 5 | High |
| Oct | 3 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Average hourly UV index in Superior
Modeled clear-sky UV for every hour of every day — when in the day sun protection actually matters.
The whole year hour by hour: each column is a day, each row an hour, and the color is the modeled clear-sky UV index — the midday peak scaled down as the sun sits lower in the sky. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
UV falls off far faster than brightness as the sun drops, so even in June the burn window is concentrated in the middle of the day: about 8 hours a day reach index 3 (protection recommended), and 4.5 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV ≥ 3 (h/day) | 0 | 0 | 1.5 | 5.5 | 7 | 8 | 8 | 7 | 5.5 | 0.5 | 0 | 0 |
| UV ≥ 6 (h/day) | 0 | 0 | 0 | 0 | 2.5 | 4.5 | 3.5 | 3 | 0 | 0 | 0 | 0 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 0 | 0 |
| Feb | 0 | 0 |
| Mar | 1.5 | 0 |
| Apr | 5.5 | 0 |
| May | 7 | 2.5 |
| Jun | 8 | 4.5 |
| Jul | 8 | 3.5 |
| Aug | 7 | 3 |
| Sep | 5.5 | 0 |
| Oct | 0.5 | 0 |
| Nov | 0 | 0 |
| Dec | 0 | 0 |
Growing season
The growing season in Superior typically lasts about 206 days, from around April 20 to November 11 — the span where a frost-free day is more likely than not. It is reliably frost-free from May 6 to October 25.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 4 | 4 | 13 | 45 | 96 | 100 | 100 | 100 | 100 | 94 | 44 | 11 |
| Frost nights | 31 | 28 | 31 | 30 | 5 | 0 | 0 | 0 | 0 | 6 | 30 | 31 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 4 | 31 |
| Feb | 4 | 28 |
| Mar | 13 | 31 |
| Apr | 45 | 30 |
| May | 96 | 5 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 100 | 0 |
| Oct | 94 | 6 |
| Nov | 44 | 30 |
| Dec | 11 | 31 |
Growing degree days
Growing degree days tally heat above 50°F: each day adds however many degrees its average temperature runs over that threshold, and cold days add nothing. Superior banks about 1,829 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around August.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°F·days) | 0 | 0 | 0 | 0 | 19 | 300 | 569 | 575 | 339 | 27 | 0 | 0 |
| Growing degree days (°F·days) | |
|---|---|
| Jan | 0 |
| Feb | 0 |
| Mar | 0 |
| Apr | 0 |
| May | 19 |
| Jun | 300 |
| Jul | 569 |
| Aug | 575 |
| Sep | 339 |
| Oct | 27 |
| Nov | 0 |
| Dec | 0 |
Solar energy
Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.
Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.
Superior receives about 3.8 kWh/m² a day of solar energy on average — moderate — with a clear seasonal swing between 1.2 and 6.1 kWh/m².
The brighter stretch of the year lasts 6.3 months, from around Mar 9 to Sep 16. The brightest month is July, averaging about 6.0 kWh/m² (intense).
The dimmest month is December, down near 1.2 kWh/m² — roughly 79% less than the July peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 1.8 | 2.8 | 4.1 | 5.1 | 5.7 | 6.0 | 6.1 | 5.2 | 3.9 | 2.4 | 1.5 | 1.2 |
| Level | Dim | Moderate | Bright | Bright | Bright | Intense | Intense | Bright | Moderate | Moderate | Dim | Dim |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 1.8 | Dim |
| Feb | 2.8 | Moderate |
| Mar | 4.1 | Bright |
| Apr | 5.1 | Bright |
| May | 5.7 | Bright |
| Jun | 6.0 | Intense |
| Jul | 6.1 | Intense |
| Aug | 5.2 | Bright |
| Sep | 3.9 | Moderate |
| Oct | 2.4 | Moderate |
| Nov | 1.5 | Dim |
| Dec | 1.2 | Dim |
Where is Superior?
Superior sits at 46.7°N, 92.1°W, 643 ft above sea level, in United States. The nearest listed city is Duluth, 4.3 mi away.
Topography around Superior
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Superior.
Within 2 miles, the terrain around Superior has only modest variations in elevation — a maximum elevation change of 118 ft around an average of 630 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 912 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,322 ft.
The land around Superior is covered by artificial surfaces (33%), water (22%) and trees (21%) within 2 miles, trees (53%) and water (28%) within 10 miles, and trees (77%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Superior (46.7208°, -92.1041°, elevation 643 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).