Climateby Month

Juneau, AK climate by month

NOAA 1991-2020 normals · 34 ft elevation

Summers in Juneau are cool; winters are cold and snowy. Highs peak at 64°F in July and fall to 33°F in January. Wet days are spread through the year, from about 16 to 23 a month. Normal snowfall is about 88 in a year. The most comfortable time to visit is June, July and August.

Warmest month
64°F
July normal high
Coldest month
24°F
January normal low
Wet days a year
230
67.0 in of precipitation
Snow a year
87.6 in
normal snowfall

How warm is Juneau?

Normal highs range from 33°F in January to 64°F in July.

20°30°40°50°60°70° January: normal high 33°F (1°C), low 24°F (-4°C) 33° 24° February: normal high 36°F (2°C), low 25°F (-4°C) March: normal high 39°F (4°C), low 27°F (-3°C) April: normal high 49°F (9°C), low 33°F (1°C) May: normal high 58°F (14°C), low 40°F (4°C) June: normal high 62°F (17°C), low 47°F (8°C) July: normal high 64°F (18°C), low 50°F (10°C) 64° 50° August: normal high 63°F (17°C), low 49°F (9°C) September: normal high 56°F (13°C), low 44°F (7°C) October: normal high 47°F (8°C), low 37°F (3°C) November: normal high 38°F (3°C), low 29°F (-2°C) December: normal high 35°F (2°C), low 26°F (-3°C) JFMAMJJASOND

Bars run from the normal low to the normal high for each month.

How rainy is Juneau?

October has the most wet days (about 23); the year brings about 67 in of precipitation.

January: 20 wet days February: 17 wet days March: 18 wet days April: 17 wet days May: 16 wet days 16 June: 17 wet days July: 19 wet days August: 19 wet days September: 22 wet days October: 23 wet days 23 November: 21 wet days December: 21 wet days JFMAMJJASOND

Wet day: at least 0.01 in of rain or melted snow, counted from daily records 1991-2020.

How much does it snow?

Normal snowfall is 87.6 in a year, most of it in January.

January: 24.5 in of snow 24.5 February: 16.7 in of snow March: 12.4 in of snow April: 1.2 in of snow May: 0.0 in of snow 0.0 June: 0.0 in of snow July: 0.0 in of snow August: 0.0 in of snow September: 0.0 in of snow October: 0.9 in of snow November: 13.8 in of snow December: 18.1 in of snow JFMAMJJASOND

How humid is Juneau?

Muggy days (dew point 65°F or higher) are rare in any month.

January: 0 muggy days 0 February: 0 muggy days March: 0 muggy days April: 0 muggy days May: 0 muggy days June: 0 muggy days July: 0 muggy days August: 0 muggy days September: 0 muggy days October: 0 muggy days November: 0 muggy days December: 0 muggy days JFMAMJJASOND

Muggy day: daily mean dew point of 65°F or higher, from hourly observations 1991-2020 at Juneau International, 6.1 mi NW of the city center.

How much daylight?

Daylight ranges from about 6.5 hours in December to 18.1 hours in June.

January: 7.3 hours of daylight February: 9.4 hours of daylight March: 11.9 hours of daylight April: 14.4 hours of daylight May: 16.8 hours of daylight June: 18.1 hours of daylight 18.1 July: 17.5 hours of daylight August: 15.3 hours of daylight September: 12.8 hours of daylight October: 10.3 hours of daylight November: 7.9 hours of daylight December: 6.5 hours of daylight 6.5 JFMAMJJASOND
See all numbers
Monthly climate normals and day counts for Juneau, 1991-2020
MonthHighLowPrecip.Wet daysSnowMuggy daysDaylight
January 33°F24°F 6.0 in20 24.5 in 0 7.3 h
February 36°F25°F 4.3 in17 16.7 in 0 9.4 h
March 39°F27°F 3.7 in18 12.4 in 0 11.9 h
April 49°F33°F 3.5 in17 1.2 in 0 14.4 h
May 58°F40°F 3.5 in16 0.0 in 0 16.8 h
June 62°F47°F 3.8 in17 0.0 in 0 18.1 h
July 64°F50°F 5.1 in19 0.0 in 0 17.5 h
August 63°F49°F 6.4 in19 0.0 in 0 15.3 h
September 56°F44°F 9.2 in22 0.0 in 0 12.8 h
October 47°F37°F 8.4 in23 0.9 in 0 10.3 h
November 38°F29°F 6.5 in21 13.8 in 0 7.9 h
December 35°F26°F 6.5 in21 18.1 in 0 6.5 h

High and low: NOAA 1991-2020 normal daily high and low. Wet days: at least 0.01 in of rain or melted snow. Muggy days: daily mean dew point 65°F or higher.

Best months to visit Juneau

By our comfort score, the best months are June, July and August.

Comfort score by month (0-100) and its parts, in days per month
MonthScoreComfortableNotable rainHot or cold
Jan 1701326
Feb 2101022
Mar 3301117
Apr 50193
May 61690
Jun 661090
Jul 6612120
Aug 6311140
Sep 432170
Oct 330172
Nov 2101418
Dec 1801424

Score = 40 × share of comfortable days + 25 × share of days without notable rain + 20 × share of days neither hot (90°F+) nor cold (high 40°F or below) + 15 × daylight. How the score works.

Frost dates in Juneau

The last spring frost typically comes around May 4, and the first fall frost around Oct 3, leaving 150 frost-free days in a typical year.

Frost and freeze dates for Juneau
Typical date1 year in 10
Last spring frost (32°F)May 4after May 18
First fall frost (32°F)Oct 3before Sep 18
Last hard freeze (28°F)Apr 19after May 2
First hard freeze (28°F)Oct 18before Oct 2
Frost-free season150 daysunder 129 days

"Typical" is the date with a 50% chance of a later spring frost (or earlier fall frost). Planting after the "1 year in 10" spring date gives a 90% chance of no further frost. The Old Farmer's Almanac publishes 30% dates, which fall between our typical and 1-in-10 dates.

Station: Juneau Intl Airport (USW00025309), NOAA 1991-2020 freeze probabilities. Frost dates for every city in Alaska.

Hottest and coldest readings, 1991-2020

The highest reading was 85°F (June 28, 2019, and 5 other days); the lowest was -10°F (December 7, 1995).

From the temperature station's daily records with NOAA quality flags removed. Not an all-time record.

Near Juneau

Similar climates elsewhere

Where the numbers come from

  • Temperature, rain, snowfall, snow depth, frost dates and humidity and wind by hour: Juneau Intl Airport (USW00025309), 6.5 mi NW of the city center, 16 ft . NOAA normals and daily records, 1991-2020.
  • Daily humidity and wind: Juneau International (703810-25309), 6.1 mi NW of the city center, 19 ft . Hourly observations, 1991-2020.
  • Not available for this location: cloud cover (no station close enough or similar enough in elevation).

Distances from the city center (USGS). Methodology · Report an error