Climate and average weather in Holladay
In Holladay, the summers are hot, fairly dry, and mostly clear and the winters are very cold, snowy, and partly cloudy.
Over the course of the year, the temperature in Holladay typically varies from 16°F to 84°F, and is rarely below 4°F or above 92°F. July is the hottest month of the year, while January is the coldest.
Based on the travel score, the best times of year to visit Holladay for warm-weather activities are from late May to mid July and early August to early October.
- Hottest
- Jul
- 84°
- Coldest
- Jan
- 17°
- Wettest
- Apr
- 3.1 in
- Driest
- Jul
- 0.9 in
- Rain / yr
- 25.8 in
- 108 wet days
- Daylight
- 9.1–14.9 h
- shortest–longest
- Elevation
- 4,465 ft
- 40.7°N
- Clearest
- Sep
- 32% cloud
Holladay is city in Salt Lake County, Utah, United States.
- Density
- 1,404/km²
- people per km²
- Founded
- 1847
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Holladay 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 early August to early October.
Temperature through the year
Daily average highs and lows in Holladay, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 3.3 months, from June 10 to September 16, with daily high temperatures above 71°F. The hottest month of the year in Holladay is July, with an average high of 84°F and low of 57°F.
The cool season lasts 3.5 months, from November 19 to March 4, with daily high temperatures below 41°F. The coldest month of the year in Holladay is January, with an average low of 17°F and high of 32°F.
Days typically run about 21°F warmer than nights, with the widest day–night swing (around 27°F) in July.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 32 | 36 | 45 | 51 | 62 | 74 | 84 | 82 | 72 | 57 | 42 | 32 |
| Avg low (°F) | 17 | 21 | 27 | 31 | 39 | 48 | 57 | 56 | 47 | 35 | 23 | 16 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| Jan | 32 | 17 |
| Feb | 36 | 21 |
| Mar | 45 | 27 |
| Apr | 51 | 31 |
| May | 62 | 39 |
| Jun | 74 | 48 |
| Jul | 84 | 57 |
| Aug | 82 | 56 |
| Sep | 72 | 47 |
| Oct | 57 | 35 |
| Nov | 42 | 23 |
| Dec | 32 | 16 |
How hot and cold Holladay 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 9°F (around December 25), with roughly 203 freezing days a year (feels-like at or below 32°F) — 72 of them bitterly cold — worst in December.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°F) | 32 | 36 | 45 | 51 | 62 | 74 | 84 | 82 | 72 | 57 | 42 | 32 |
| Air high (°F) | 32 | 36 | 45 | 51 | 62 | 74 | 84 | 82 | 72 | 57 | 42 | 32 |
| Feels-like low (°F) | 11 | 15 | 22 | 27 | 36 | 47 | 57 | 56 | 45 | 31 | 18 | 10 |
| Air low (°F) | 17 | 21 | 27 | 31 | 39 | 48 | 57 | 56 | 47 | 35 | 23 | 16 |
| Feels-like high (°F) | Air high (°F) | Feels-like low (°F) | Air low (°F) | |
|---|---|---|---|---|
| Jan | 32 | 32 | 11 | 17 |
| Feb | 36 | 36 | 15 | 21 |
| Mar | 45 | 45 | 22 | 27 |
| Apr | 51 | 51 | 27 | 31 |
| May | 62 | 62 | 36 | 39 |
| Jun | 74 | 74 | 47 | 48 |
| Jul | 84 | 84 | 57 | 57 |
| Aug | 82 | 82 | 56 | 56 |
| Sep | 72 | 72 | 45 | 47 |
| Oct | 57 | 57 | 31 | 35 |
| Nov | 42 | 42 | 18 | 23 |
| Dec | 32 | 32 | 10 | 16 |
Average hourly temperature in Holladay
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 July afternoons, near 84°F, and coldest before dawn in January, near 17°F.
Holladay 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 | 32° / 17° | 2.8 | 11.5 | 11.8 | 9.4 | 0.0 |
| Feb | 36° / 21° | 2.3 | 10.3 | 10.4 | 10.4 | 0.0 |
| Mar | 45° / 27° | 2.5 | 11.2 | 10.1 | 11.7 | 0.9 |
| Apr | 51° / 31° | 3.1 | 12.7 | 9.3 | 13.1 | 2.4 |
| May | 62° / 39° | 2.8 | 11.8 | 3.5 | 14.2 | 5.1 |
| Jun | 74° / 48° | 1.5 | 6.5 | 0.4 | 14.9 | 7.6 |
| Jul | 84° / 57° | 0.9 | 4.7 | 0 | 14.6 | 6.7 |
| Aug | 82° / 56° | 0.9 | 5.1 | 0 | 13.6 | 7.2 |
| Sep | 72° / 47° | 1.8 | 6.5 | 0.6 | 12.3 | 7.6 |
| Oct | 57° / 35° | 2.2 | 8.3 | 3.8 | 10.9 | 4.6 |
| Nov | 42° / 23° | 2.3 | 9.5 | 8.5 | 9.7 | 0.6 |
| Dec | 32° / 16° | 2.6 | 10.1 | 10.3 | 9.1 | 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.
Holladay gets about 25.8 in of precipitation a year. On a typical day the chance of rain is some rain, but that rises and falls sharply with the seasons.
The wetter season lasts 7.2 months, from around Oct 30 to Jun 5, peaking in April at about 42% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Jun 30.
April is the wettest month by volume, with 3.1 in over about 13 wet days; July is the driest, with 0.9 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 (%) | 36 | 37 | 36 | 41 | 38 | 22 | 16 | 17 | 22 | 26 | 32 | 33 |
| Rain days | 12 | 10 | 11 | 13 | 12 | 7 | 5 | 5 | 7 | 8 | 10 | 10 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 36 | 12 |
| Feb | 37 | 10 |
| Mar | 36 | 11 |
| Apr | 41 | 13 |
| May | 38 | 12 |
| Jun | 22 | 7 |
| Jul | 16 | 5 |
| Aug | 17 | 5 |
| Sep | 22 | 7 |
| Oct | 26 | 8 |
| Nov | 32 | 10 |
| Dec | 33 | 10 |
Monthly rainfall
Over a full year, Holladay collects about 25.8 in of rain across 108 wet days — roughly 2.2 in in an average month.
It doesn’t fall evenly. April is the wettest month with 3.1 in, while July is the driest at just 0.9 in. The three wettest months alone bring about 34% 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) | 2.8 | 2.3 | 2.5 | 3.1 | 2.8 | 1.5 | 0.9 | 0.9 | 1.8 | 2.2 | 2.3 | 2.6 |
| Rain days | 12 | 10 | 11 | 13 | 12 | 7 | 5 | 5 | 7 | 8 | 10 | 10 |
| Snow days | 12 | 10 | 10 | 9 | 4 | 0 | 0 | 0 | 1 | 4 | 9 | 10 |
| Rainfall (in) | Rain days | Snow days | |
|---|---|---|---|
| Jan | 2.8 | 12 | 12 |
| Feb | 2.3 | 10 | 10 |
| Mar | 2.5 | 11 | 10 |
| Apr | 3.1 | 13 | 9 |
| May | 2.8 | 12 | 4 |
| Jun | 1.5 | 7 | 0 |
| Jul | 0.9 | 5 | 0 |
| Aug | 0.9 | 5 | 0 |
| Sep | 1.8 | 7 | 1 |
| Oct | 2.2 | 8 | 4 |
| Nov | 2.3 | 10 | 9 |
| Dec | 2.6 | 10 | 10 |
Snow in Holladay
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.
Holladay averages about 69 snowy days a year. Snow season runs roughly Sep 14 to Jun 14 — about 9 months.
February is snowiest, with roughly 11 days of snow and an estimated 24 in of snowfall. Over the year that adds up to an estimated 137 in of snow.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snow days | 12 | 10 | 10 | 9 | 4 | 0 | 0 | 0 | 1 | 4 | 9 | 10 |
| Snowfall (in) | 26 | 24 | 16 | 17 | 5 | 1 | 0 | 0 | 1 | 5 | 17 | 24 |
| Snow days | Snowfall (in) | |
|---|---|---|
| Jan | 12 | 26 |
| Feb | 10 | 24 |
| Mar | 10 | 16 |
| Apr | 9 | 17 |
| May | 4 | 5 |
| Jun | 0 | 1 |
| Jul | 0 | 0 |
| Aug | 0 | 0 |
| Sep | 1 | 1 |
| Oct | 4 | 5 |
| Nov | 9 | 17 |
| Dec | 10 | 24 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Holladay, 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 30 and lasts for 5.0 months, ending around October 28. The clearest month is August, when the sky is clear, mostly clear, or partly cloudy 82% of the time on average.
The cloudier part of the year begins around October 29 and lasts for 7.0 months, ending around May 29. The cloudiest month is January, when it is overcast or mostly cloudy 56% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 44 | 46 | 49 | 49 | 55 | 75 | 82 | 82 | 79 | 68 | 53 | 44 |
| Cloudier (%) | 56 | 54 | 51 | 51 | 45 | 25 | 18 | 18 | 21 | 32 | 47 | 56 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 44 | 56 |
| Feb | 46 | 54 |
| Mar | 49 | 51 |
| Apr | 49 | 51 |
| May | 55 | 45 |
| Jun | 75 | 25 |
| Jul | 82 | 18 |
| Aug | 82 | 18 |
| Sep | 79 | 21 |
| Oct | 68 | 32 |
| Nov | 53 | 47 |
| Dec | 44 | 56 |
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 12, brings about 14 h 54 min of light; the shortest, around January 1, only 9 h 06 min — a swing of roughly 5 h 48 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 9.4 | 10.4 | 11.7 | 13.1 | 14.2 | 14.9 | 14.6 | 13.6 | 12.3 | 10.9 | 9.7 | 9.1 |
| Sunrise (AM) | 7:55 | 7:30 | 6:47 | 5:55 | 5:16 | 5:01 | 5:14 | 5:42 | 6:14 | 6:45 | 7:22 | 7:50 |
| Sunset (PM) | 5:18 | 5:54 | 6:27 | 7:00 | 7:31 | 7:54 | 7:52 | 7:20 | 6:30 | 5:39 | 5:03 | 4:57 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 9.4 | 7:55 | 5:18 |
| Feb | 10.4 | 7:30 | 5:54 |
| Mar | 11.7 | 6:47 | 6:27 |
| Apr | 13.1 | 5:55 | 7:00 |
| May | 14.2 | 5:16 | 7:31 |
| Jun | 14.9 | 5:01 | 7:54 |
| Jul | 14.6 | 5:14 | 7:52 |
| Aug | 13.6 | 5:42 | 7:20 |
| Sep | 12.3 | 6:14 | 6:30 |
| Oct | 10.9 | 6:45 | 5:39 |
| Nov | 9.7 | 7:22 | 5:03 |
| Dec | 9.1 | 7:50 | 4:57 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Holladay averages about 13 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 8 and 21 days.
The sunnier stretch runs 4.8 months, from around Jun 4 to Oct 28. The sunniest month is June, with roughly 17 sunny days (bright).
The greyest month is February, down near 9 sunny days — about 49% fewer than the June peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 9 | 8 | 9 | 9 | 11 | 17 | 20 | 19 | 19 | 16 | 11 | 9 |
| Sky | Mixed | Mixed | Mixed | Mixed | Mixed | Bright | Bright | Bright | Bright | Bright | Mixed | Mixed |
| Sunny days | Sky | |
|---|---|---|
| Jan | 9 | Mixed |
| Feb | 8 | Mixed |
| Mar | 9 | Mixed |
| Apr | 9 | Mixed |
| May | 11 | Mixed |
| Jun | 17 | Bright |
| Jul | 20 | Bright |
| Aug | 19 | Bright |
| Sep | 19 | Bright |
| Oct | 16 | Bright |
| Nov | 11 | Mixed |
| Dec | 9 | Mixed |
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 Holladay, the air stays dry or comfortable essentially all year. Even in July, the muggiest month, it feels humid or worse only about 0% of the time — humidity is not something you need to plan around here.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 100 | 100 | 96 | 98 | 99 | 100 | 100 | 100 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 2 | 1 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | |
|---|---|---|
| Jan | 100 | 0 |
| Feb | 100 | 0 |
| Mar | 100 | 0 |
| Apr | 100 | 0 |
| May | 100 | 0 |
| Jun | 100 | 0 |
| Jul | 96 | 4 |
| Aug | 98 | 2 |
| Sep | 99 | 1 |
| Oct | 100 | 0 |
| Nov | 100 | 0 |
| Dec | 100 | 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.
Wind in Holladay is steady company: average speeds sit near 4 mph — calm — in every month of the year, with no meaningful windy or calm season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 4 | 4 | 4 | 5 | 4 | 5 | 5 | 5 | 4 | 4 | 4 | 4 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| Jan | 4 | calm |
| Feb | 4 | calm |
| Mar | 4 | calm |
| Apr | 5 | calm |
| May | 4 | calm |
| Jun | 5 | calm |
| Jul | 5 | calm |
| Aug | 5 | calm |
| Sep | 4 | calm |
| Oct | 4 | calm |
| Nov | 4 | calm |
| Dec | 4 | calm |
Best time to visit Holladay
To characterize how pleasant the weather is in Holladay throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around late September, Holladay 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 times of year to visit Holladay for general outdoor tourist activities run from early June to mid July and again from early August to early October, with a peak score in the last week of June.
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 | 0.9 | 2.4 | 5.1 | 7.5 | 6.7 | 7.2 | 7.5 | 4.6 | 0.7 | 0.0 |
| Rating | poor | poor | poor | poor | fair | ideal | good | good | ideal | fair | poor | poor |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 0.0 | poor |
| Feb | 0.0 | poor |
| Mar | 0.9 | poor |
| Apr | 2.4 | poor |
| May | 5.1 | fair |
| Jun | 7.5 | ideal |
| Jul | 6.7 | good |
| Aug | 7.2 | good |
| Sep | 7.5 | ideal |
| Oct | 4.6 | fair |
| Nov | 0.7 | 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 Holladay for hot-weather activities is from mid June to early September, with a peak score in the second week of July.
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 Holladay, 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 July (highs near 84°F), the essentials are light clothes and sun protection. In the cold season around January (highs near 32°F), pack a warm layer, a heavy coat and rain gear.
In July, Holladay sees daytime highs around 84°F and nights near 57°F. Pack light clothes and sun protection. About 5 days see rain.
UV index (midday) in Holladay 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 Holladay peaks around June 23 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 5 | 7 | 10 | 10 | 9 | 7 | 5 | 3 | 2 |
| Level | Moderate | Moderate | Moderate | Moderate | Very high | Very high | Very high | Very high | Very high | Moderate | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 5 | Moderate |
| May | 7 | Very high |
| Jun | 10 | Very high |
| Jul | 10 | Very high |
| Aug | 9 | Very high |
| Sep | 7 | Very high |
| Oct | 5 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Moderate |
Average hourly UV index in Holladay
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 8.5 hours a day reach index 3 (protection recommended), and 6 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 | 1 | 4.5 | 5.5 | 7.5 | 8.5 | 8.5 | 8 | 6.5 | 4.5 | 0 | 0 |
| UV ≥ 6 (h/day) | 0 | 0 | 0 | 0 | 3.5 | 6 | 6 | 5 | 3 | 0 | 0 | 0 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 0 | 0 |
| Feb | 1 | 0 |
| Mar | 4.5 | 0 |
| Apr | 5.5 | 0 |
| May | 7.5 | 3.5 |
| Jun | 8.5 | 6 |
| Jul | 8.5 | 6 |
| Aug | 8 | 5 |
| Sep | 6.5 | 3 |
| Oct | 4.5 | 0 |
| Nov | 0 | 0 |
| Dec | 0 | 0 |
Air quality in Holladay by month
Average fine-particle pollution (PM2.5) through the year — so you can see which months the air is worst, not just the yearly average.
Air quality in Holladay is worst in September — around 22 µg/m³ PM2.5 (moderate), about 2.6× the cleanest month (June, 9 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 11 | 11 | 12 | 10 | 10 | 9 | 11 | 14 | 22 | 12 | 9 | 9 |
| Level | Good | Good | Moderate | Good | Good | Good | Good | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 11 | Good |
| Mar | 12 | Moderate |
| Apr | 10 | Good |
| May | 10 | Good |
| Jun | 9 | Good |
| Jul | 11 | Good |
| Aug | 14 | Moderate |
| Sep | 22 | Moderate |
| Oct | 12 | Good |
| Nov | 9 | Good |
| Dec | 9 | Good |
Growing season
The growing season in Holladay typically lasts about 188 days, from around April 19 to October 23 — the span where a frost-free day is more likely than not. It is reliably frost-free from May 18 to September 29.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 4 | 9 | 24 | 47 | 86 | 99 | 100 | 100 | 97 | 64 | 18 | 5 |
| Frost nights | 31 | 28 | 31 | 30 | 15 | 0 | 0 | 0 | 2 | 31 | 30 | 31 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 4 | 31 |
| Feb | 9 | 28 |
| Mar | 24 | 31 |
| Apr | 47 | 30 |
| May | 86 | 15 |
| Jun | 99 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 97 | 2 |
| Oct | 64 | 31 |
| Nov | 18 | 30 |
| Dec | 5 | 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. Holladay banks about 1,898 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around July.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°F·days) | 0 | 0 | 0 | 0 | 52 | 339 | 630 | 590 | 278 | 10 | 0 | 0 |
| Growing degree days (°F·days) | |
|---|---|
| Jan | 0 |
| Feb | 0 |
| Mar | 0 |
| Apr | 0 |
| May | 52 |
| Jun | 339 |
| Jul | 630 |
| Aug | 590 |
| Sep | 278 |
| Oct | 10 |
| 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.
Holladay receives about 5.2 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 2.1 and 8.3 kWh/m².
The brighter stretch of the year lasts 6.2 months, from around Mar 19 to Sep 24. The brightest month is June, averaging about 8.1 kWh/m² (intense).
The dimmest month is December, down near 2.1 kWh/m² — roughly 73% less than the June peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 2.4 | 3.5 | 5.1 | 6.4 | 7.3 | 8.1 | 8.0 | 7.1 | 5.7 | 4.0 | 2.7 | 2.1 |
| Level | Moderate | Moderate | Bright | Intense | Intense | Intense | Intense | Intense | Bright | Bright | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 2.4 | Moderate |
| Feb | 3.5 | Moderate |
| Mar | 5.1 | Bright |
| Apr | 6.4 | Intense |
| May | 7.3 | Intense |
| Jun | 8.1 | Intense |
| Jul | 8.0 | Intense |
| Aug | 7.1 | Intense |
| Sep | 5.7 | Bright |
| Oct | 4.0 | Bright |
| Nov | 2.7 | Moderate |
| Dec | 2.1 | Moderate |
Where is Holladay?
Holladay sits at 40.7°N, 111.8°W, 4,465 ft above sea level, in United States. The nearest listed city is East Millcreek, 2.5 mi away.
Topography around Holladay
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Holladay.
Within 2 miles, the terrain around Holladay has large variations in elevation — a maximum elevation change of 2,785 ft around an average of 4,652 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 7,051 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,635 ft.
The land around Holladay is covered by trees (53%) and artificial surfaces (36%) within 2 miles, trees (44%) and artificial surfaces (35%) within 10 miles, and grassland (39%) and trees (30%) 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 Holladay (40.6688°, -111.8247°, elevation 4,465 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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).