Climate and average weather in Juneau
In Juneau, the summers are mild, wet, and mostly cloudy and the winters are very cold, snowy, and mostly cloudy.
Over the course of the year, the temperature in Juneau typically varies from 19°F to 60°F, and is rarely below -5°F or above 70°F. July is the hottest month of the year, while January is the coldest.
Based on the travel score, the best time of year to visit Juneau for warm-weather activities is from mid June to late August.
- Hottest
- Jul
- 60°
- Coldest
- Jan
- 19°
- Wettest
- Sep
- 13.0 in
- Driest
- Jun
- 5.3 in
- Rain / yr
- 104.0 in
- 227 wet days
- Daylight
- 6.1–17.9 h
- shortest–longest
- Elevation
- 56 ft
- 58.3°N
- Clearest
- Mar
- 72% cloud
Juneau is consolidated city-borough and capital of the U.S. state of Alaska.
- Density
- 4/km²
- people per km²
- Founded
- 1881
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Juneau 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 August.
Temperature through the year
Daily average highs and lows in Juneau, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 4.0 months, from May 22 to September 20, with daily high temperatures above 52°F. The hottest month of the year in Juneau is July, with an average high of 60°F and low of 50°F.
The cool season lasts 4.0 months, from November 14 to March 16, with daily high temperatures below 33°F. The coldest month of the year in Juneau is January, with an average low of 19°F and high of 27°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) | 27 | 29 | 33 | 41 | 50 | 58 | 60 | 59 | 53 | 43 | 33 | 29 |
| Avg low (°F) | 19 | 20 | 22 | 30 | 37 | 46 | 50 | 49 | 43 | 34 | 24 | 21 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| Jan | 27 | 19 |
| Feb | 29 | 20 |
| Mar | 33 | 22 |
| Apr | 41 | 30 |
| May | 50 | 37 |
| Jun | 58 | 46 |
| Jul | 60 | 50 |
| Aug | 59 | 49 |
| Sep | 53 | 43 |
| Oct | 43 | 34 |
| Nov | 33 | 24 |
| Dec | 29 | 21 |
How hot and cold Juneau 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 10°F (around January 6), with roughly 214 freezing days a year (feels-like at or below 32°F) — 92 of them bitterly cold — worst in January.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°F) | 27 | 29 | 33 | 41 | 50 | 58 | 60 | 59 | 53 | 43 | 33 | 29 |
| Air high (°F) | 27 | 29 | 33 | 41 | 50 | 58 | 60 | 59 | 53 | 43 | 33 | 29 |
| Feels-like low (°F) | 11 | 13 | 16 | 25 | 34 | 44 | 49 | 48 | 41 | 29 | 18 | 13 |
| Air low (°F) | 19 | 20 | 22 | 30 | 37 | 46 | 50 | 49 | 43 | 34 | 24 | 21 |
| Feels-like high (°F) | Air high (°F) | Feels-like low (°F) | Air low (°F) | |
|---|---|---|---|---|
| Jan | 27 | 27 | 11 | 19 |
| Feb | 29 | 29 | 13 | 20 |
| Mar | 33 | 33 | 16 | 22 |
| Apr | 41 | 41 | 25 | 30 |
| May | 50 | 50 | 34 | 37 |
| Jun | 58 | 58 | 44 | 46 |
| Jul | 60 | 60 | 49 | 50 |
| Aug | 59 | 59 | 48 | 49 |
| Sep | 53 | 53 | 41 | 43 |
| Oct | 43 | 43 | 29 | 34 |
| Nov | 33 | 33 | 18 | 24 |
| Dec | 29 | 29 | 13 | 21 |
Average hourly temperature in Juneau
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 60°F, and coldest before dawn in January, near 19°F.
Juneau 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 | 27° / 19° | 9.8 | 19.8 | 19.4 | 6.8 | 0.0 |
| Feb | 29° / 20° | 7.4 | 16.6 | 15.9 | 8.9 | 0.0 |
| Mar | 33° / 22° | 7.2 | 17.9 | 17.7 | 11.4 | 0.0 |
| Apr | 41° / 30° | 5.6 | 16.5 | 11.9 | 14 | 0.2 |
| May | 50° / 37° | 5.4 | 16 | 3.6 | 16.4 | 1.9 |
| Jun | 58° / 46° | 5.3 | 16.5 | 0 | 17.8 | 3.3 |
| Jul | 60° / 50° | 7.0 | 18.9 | 0 | 17.2 | 3.7 |
| Aug | 59° / 49° | 9.3 | 19.3 | 0 | 15.1 | 3.5 |
| Sep | 53° / 43° | 13.0 | 21 | 0.2 | 12.5 | 2.2 |
| Oct | 43° / 34° | 13.0 | 22.7 | 8.2 | 9.9 | 0.4 |
| Nov | 33° / 24° | 10.3 | 20.9 | 18.6 | 7.5 | 0.0 |
| Dec | 29° / 21° | 10.8 | 21.1 | 20.4 | 6.2 | 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.
Juneau gets about 104.0 in of precipitation a year. On a typical day the chance of rain is very wet, but that rises and falls sharply with the seasons.
The wetter season lasts 4.4 months, from around Aug 16 to Dec 28, peaking in October at about 75% chance on a given day. The drier stretch runs the rest of the year, bottoming out around May 16.
September is the wettest month by volume, with 13.0 in over about 21 wet days; June is the driest, with 5.3 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 (%) | 63 | 60 | 58 | 55 | 52 | 55 | 59 | 63 | 70 | 73 | 70 | 68 |
| Rain days | 20 | 17 | 18 | 17 | 16 | 17 | 19 | 19 | 21 | 23 | 21 | 21 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 63 | 20 |
| Feb | 60 | 17 |
| Mar | 58 | 18 |
| Apr | 55 | 17 |
| May | 52 | 16 |
| Jun | 55 | 17 |
| Jul | 59 | 19 |
| Aug | 63 | 19 |
| Sep | 70 | 21 |
| Oct | 73 | 23 |
| Nov | 70 | 21 |
| Dec | 68 | 21 |
Monthly rainfall
Over a full year, Juneau collects about 104.0 in of rain across 227 wet days — roughly 8.7 in in an average month.
It doesn’t fall evenly. September is the wettest month with 13.0 in, while June is the driest at just 5.3 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) | 9.8 | 7.4 | 7.2 | 5.6 | 5.4 | 5.3 | 7.0 | 9.3 | 13.0 | 13.0 | 10.3 | 10.8 |
| Rain days | 20 | 17 | 18 | 17 | 16 | 17 | 19 | 19 | 21 | 23 | 21 | 21 |
| Snow days | 19 | 16 | 18 | 12 | 4 | 0 | 0 | 0 | 0 | 8 | 19 | 20 |
| Rainfall (in) | Rain days | Snow days | |
|---|---|---|---|
| Jan | 9.8 | 20 | 19 |
| Feb | 7.4 | 17 | 16 |
| Mar | 7.2 | 18 | 18 |
| Apr | 5.6 | 17 | 12 |
| May | 5.4 | 16 | 4 |
| Jun | 5.3 | 17 | 0 |
| Jul | 7.0 | 19 | 0 |
| Aug | 9.3 | 19 | 0 |
| Sep | 13.0 | 21 | 0 |
| Oct | 13.0 | 23 | 8 |
| Nov | 10.3 | 21 | 19 |
| Dec | 10.8 | 21 | 20 |
Snow in Juneau
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.
Juneau averages about 116 snowy days a year. Snow season runs roughly Sep 24 to May 31 — about 8.2 months.
December is snowiest, with roughly 20 days of snow and an estimated 89 in of snowfall. Over the year that adds up to an estimated 432 in of snow.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snow days | 19 | 16 | 18 | 12 | 4 | 0 | 0 | 0 | 0 | 8 | 19 | 20 |
| Snowfall (in) | 79 | 70 | 63 | 35 | 6 | 0 | 0 | 0 | 0 | 24 | 66 | 89 |
| Snow days | Snowfall (in) | |
|---|---|---|
| Jan | 19 | 79 |
| Feb | 16 | 70 |
| Mar | 18 | 63 |
| Apr | 12 | 35 |
| May | 4 | 6 |
| Jun | 0 | 0 |
| Jul | 0 | 0 |
| Aug | 0 | 0 |
| Sep | 0 | 0 |
| Oct | 8 | 24 |
| Nov | 19 | 66 |
| Dec | 20 | 89 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Juneau, the average share of the sky covered by clouds shows moderate seasonal variation over the course of the year.
The clearer part of the year begins around February 1 and lasts for 4.0 months, ending around June 1. The clearest month is May, when the sky is clear, mostly clear, or partly cloudy 28% of the time on average.
The cloudier part of the year begins around June 2 and lasts for 1.9 months, ending around July 30. The cloudiest month is October, when it is overcast or mostly cloudy 84% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 21 | 26 | 28 | 27 | 28 | 20 | 17 | 20 | 17 | 16 | 19 | 20 |
| Cloudier (%) | 79 | 74 | 72 | 73 | 72 | 80 | 83 | 80 | 83 | 84 | 81 | 80 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 21 | 79 |
| Feb | 26 | 74 |
| Mar | 28 | 72 |
| Apr | 27 | 73 |
| May | 28 | 72 |
| Jun | 20 | 80 |
| Jul | 17 | 83 |
| Aug | 20 | 80 |
| Sep | 17 | 83 |
| Oct | 16 | 84 |
| Nov | 19 | 81 |
| Dec | 20 | 80 |
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 14, brings about 17 h 54 min of light; the shortest, around December 14, only 6 h 06 min — a swing of roughly 11 h 48 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 6.8 | 8.9 | 11.4 | 14.0 | 16.4 | 17.8 | 17.2 | 15.1 | 12.5 | 9.9 | 7.5 | 6.2 |
| Sunrise (AM) | 8:44 | 7:45 | 6:26 | 4:56 | 3:41 | 3:01 | 3:24 | 4:28 | 5:37 | 6:46 | 7:59 | 8:51 |
| Sunset (PM) | 3:30 | 4:39 | 5:48 | 7:00 | 8:07 | 8:55 | 8:42 | 7:36 | 6:07 | 4:40 | 3:27 | 2:57 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 6.8 | 8:44 | 3:30 |
| Feb | 8.9 | 7:45 | 4:39 |
| Mar | 11.4 | 6:26 | 5:48 |
| Apr | 14.0 | 4:56 | 7:00 |
| May | 16.4 | 3:41 | 8:07 |
| Jun | 17.8 | 3:01 | 8:55 |
| Jul | 17.2 | 3:24 | 8:42 |
| Aug | 15.1 | 4:28 | 7:36 |
| Sep | 12.5 | 5:37 | 6:07 |
| Oct | 9.9 | 6:46 | 4:40 |
| Nov | 7.5 | 7:59 | 3:27 |
| Dec | 6.2 | 8:51 | 2:57 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Juneau averages about 5 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 3 and 7 days.
The sunnier stretch runs 3.9 months, from around Jan 30 to May 28. The sunniest month is February, with roughly 6 sunny days (gloomy).
The greyest month is August, down near 4 sunny days — about 36% fewer than the February peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 5 | 6 | 7 | 6 | 6 | 3 | 3 | 4 | 3 | 4 | 4 | 4 |
| Sky | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy |
| Sunny days | Sky | |
|---|---|---|
| Jan | 5 | Gloomy |
| Feb | 6 | Gloomy |
| Mar | 7 | Gloomy |
| Apr | 6 | Gloomy |
| May | 6 | Gloomy |
| Jun | 3 | Gloomy |
| Jul | 3 | Gloomy |
| Aug | 4 | Gloomy |
| Sep | 3 | Gloomy |
| Oct | 4 | Gloomy |
| Nov | 4 | Gloomy |
| Dec | 4 | 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 Juneau, the air stays dry or comfortable essentially all year. Even in June, 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 | 99 | 96 | 95 | 100 | 100 | 100 | 100 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 1 | 4 | 5 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | |
|---|---|---|
| Jan | 100 | 0 |
| Feb | 100 | 0 |
| Mar | 100 | 0 |
| Apr | 100 | 0 |
| May | 100 | 0 |
| Jun | 99 | 1 |
| Jul | 96 | 4 |
| Aug | 95 | 5 |
| Sep | 100 | 0 |
| 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.
Across the year, average wind speed in Juneau is typically calm, near 5 mph, and varies little with the seasons.
The windier part of the year lasts 6.4 months, from around Sep 17 to Mar 29. The windiest month is December, averaging about 6 mph (calm).
The calmer part of the year runs from around Mar 30 to Sep 16, with July the calmest month at about 3 mph.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 6 | 5 | 5 | 4 | 4 | 3 | 3 | 4 | 5 | 5 | 6 | 6 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| Jan | 6 | calm |
| Feb | 5 | calm |
| Mar | 5 | calm |
| Apr | 4 | calm |
| May | 4 | calm |
| Jun | 3 | calm |
| Jul | 3 | calm |
| Aug | 4 | calm |
| Sep | 5 | calm |
| Oct | 5 | calm |
| Nov | 6 | calm |
| Dec | 6 | calm |
Best time to visit Juneau
To characterize how pleasant the weather is in Juneau throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around late June, Juneau is still near the start of its best-weather window — great conditions with the peak-season crowds not yet at full swing.
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 Juneau for general outdoor tourist activities is from mid June to late August, 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 | 0.2 | 1.9 | 3.3 | 3.7 | 3.5 | 2.2 | 0.5 | 0.0 | 0.0 |
| Rating | poor | poor | poor | poor | poor | poor | fair | fair | poor | poor | poor | poor |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 0.0 | poor |
| Feb | 0.0 | poor |
| Mar | 0.0 | poor |
| Apr | 0.2 | poor |
| May | 1.9 | poor |
| Jun | 3.3 | poor |
| Jul | 3.7 | fair |
| Aug | 3.5 | fair |
| Sep | 2.2 | poor |
| Oct | 0.5 | poor |
| Nov | 0.0 | poor |
| Dec | 0.0 | poor |
The beach/pool score favors clear, rainless days with daytime highs between 75°F and 93°F. Juneau rarely gets warm enough to lift this score — no time of year really suits hot-weather activities here.
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 Juneau, 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 60°F), the essentials are a warm layer and rain gear. In the cold season around January (highs near 27°F), pack a warm layer, a heavy coat and rain gear.
In July, Juneau sees daytime highs around 60°F and nights near 50°F. Pack rain gear. Worth having: a warm layer. About 19 days see rain.
UV index (midday) in Juneau 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 Juneau peaks around July 15 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 0 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 0 | 1 | 2 | 4 | 5 | 7 | 9 | 5 | 4 | 1 | 1 | 0 |
| Level | Low | Low | Moderate | Moderate | Moderate | High | Very high | High | Moderate | Low | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 0 | Low |
| Feb | 1 | Low |
| Mar | 2 | Moderate |
| Apr | 4 | Moderate |
| May | 5 | Moderate |
| Jun | 7 | High |
| Jul | 9 | Very high |
| Aug | 5 | High |
| Sep | 4 | Moderate |
| Oct | 1 | Low |
| Nov | 1 | Low |
| Dec | 0 | Low |
Average hourly UV index in Juneau
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 July the burn window is concentrated in the middle of the day: about 9 hours a day reach index 3 (protection recommended), and 5.5 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 | 0 | 3.5 | 6.5 | 8.5 | 9 | 6.5 | 4 | 0 | 0 | 0 |
| UV ≥ 6 (h/day) | 0 | 0 | 0 | 0 | 0 | 3 | 5.5 | 0 | 0 | 0 | 0 | 0 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 0 | 0 |
| Feb | 0 | 0 |
| Mar | 0 | 0 |
| Apr | 3.5 | 0 |
| May | 6.5 | 0 |
| Jun | 8.5 | 3 |
| Jul | 9 | 5.5 |
| Aug | 6.5 | 0 |
| Sep | 4 | 0 |
| Oct | 0 | 0 |
| Nov | 0 | 0 |
| Dec | 0 | 0 |
Growing season
The growing season in Juneau typically lasts about 178 days, from around April 27 to October 21 — the span where a frost-free day is more likely than not. It is reliably frost-free from May 23 to September 30.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 18 | 16 | 16 | 34 | 79 | 100 | 100 | 100 | 98 | 61 | 22 | 18 |
| Frost nights | 31 | 28 | 31 | 30 | 23 | 0 | 0 | 0 | 2 | 31 | 30 | 31 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 18 | 31 |
| Feb | 16 | 28 |
| Mar | 16 | 31 |
| Apr | 34 | 30 |
| May | 79 | 23 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 98 | 2 |
| Oct | 61 | 31 |
| Nov | 22 | 30 |
| Dec | 18 | 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. Juneau banks about 336 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 | 0 | 50 | 152 | 129 | 6 | 0 | 0 | 0 |
| Growing degree days (°F·days) | |
|---|---|
| Jan | 0 |
| Feb | 0 |
| Mar | 0 |
| Apr | 0 |
| May | 0 |
| Jun | 50 |
| Jul | 152 |
| Aug | 129 |
| Sep | 6 |
| Oct | 0 |
| 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.
Juneau receives about 2.5 kWh/m² a day of solar energy on average — moderate — with a clear seasonal swing between 0.3 and 5.2 kWh/m².
The brighter stretch of the year lasts 5.7 months, from around Mar 15 to Sep 3. The brightest month is May, averaging about 5.1 kWh/m² (bright).
The dimmest month is December, down near 0.3 kWh/m² — roughly 94% less than the May peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 0.4 | 1.2 | 2.6 | 4.2 | 5.1 | 5.0 | 4.1 | 3.3 | 2.0 | 1.1 | 0.5 | 0.3 |
| Level | Dim | Dim | Moderate | Bright | Bright | Bright | Bright | Moderate | Moderate | Dim | Dim | Dim |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 0.4 | Dim |
| Feb | 1.2 | Dim |
| Mar | 2.6 | Moderate |
| Apr | 4.2 | Bright |
| May | 5.1 | Bright |
| Jun | 5.0 | Bright |
| Jul | 4.1 | Bright |
| Aug | 3.3 | Moderate |
| Sep | 2.0 | Moderate |
| Oct | 1.1 | Dim |
| Nov | 0.5 | Dim |
| Dec | 0.3 | Dim |
Where is Juneau?
Juneau sits at 58.3°N, 134.4°W, 56 ft above sea level, in United States. The nearest listed city is Whitehorse, 168 mi away.
What Juneau looks like
Topography around Juneau
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Juneau.
Within 2 miles, the terrain around Juneau has large variations in elevation — a maximum elevation change of 3,556 ft around an average of 945 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 5,486 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 7,946 ft.
The land around Juneau is covered by trees (57%) within 2 miles, trees (40%) and water (22%) within 10 miles, and trees (35%), snow and ice (25%) and water (24%) 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 Juneau (58.3019°, -134.4197°, elevation 56 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).