Juneau weather in December: Juneau, Alaska: normal highs, lows, rain and records for December
Juneau in December has a normal high of 35°F and a normal low of 26°F, a daily mean of 30°F, falling from 36°F on the 1st to 33°F by the 31st. Measurable precipitation falls on 21 days in a normal December, 6.53 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 2°C and low of −3°C, 166 mm of precipitation and 46 cm of snow in December.
- NOAA stationJuneau Airport
- Station IDUSW00025309
- Location58.36°N 134.56°W
- Elevation16 ft (5 m)
- Population31,572
- Jan 33° 24°
- Feb 36° 25°
- Mar 39° 27°
- Apr 49° 33°
- May 58° 40°
- Jun 62° 47°
- Jul 64° 50°
- Aug 63° 49°
- Sep 56° 44°
- Oct 47° 37°
- Nov 38° 29°
- Dec 35° 26°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Juneau in December?
The normal high is 35°F and the normal low 26°F, for a daily mean of 30.3°F. December is 3.5°F cooler than November and 1.8°F warmer than January. December is the 10th warmest month of the year in Juneau and the 4th wettest. Across the month the normal high falls 3°F, from 36°F on December 1 to 33°F on December 31. From one year to the next December's mean temperature typically moves about 4.3°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 26°F and 35°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 69%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 36°F | 27°F | 69% | 46% |
| December 8 | 36°F | 27°F | 69% | 45% |
| December 15 | 35°F | 26°F | 68% | 45% |
| December 22 | 34°F | 25°F | 67% | 44% |
| December 31 | 33°F | 24°F | 66% | 43% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 36°F | 27°F | 69% | 46% | 7 h |
| December 2 | 36°F | 27°F | 69% | 46% | 6 h 50 min |
| December 3 | 36°F | 27°F | 69% | 46% | 6 h 50 min |
| December 4 | 36°F | 27°F | 69% | 46% | 6 h 50 min |
| December 5 | 36°F | 27°F | 69% | 45% | 6 h 40 min |
| December 6 | 36°F | 27°F | 69% | 45% | 6 h 40 min |
| December 7 | 36°F | 27°F | 69% | 45% | 6 h 40 min |
| December 8 | 36°F | 27°F | 69% | 45% | 6 h 40 min |
| December 9 | 36°F | 27°F | 69% | 45% | 6 h 40 min |
| December 10 | 35°F | 27°F | 69% | 45% | 6 h 30 min |
| December 11 | 35°F | 27°F | 69% | 45% | 6 h 30 min |
| December 12 | 35°F | 26°F | 69% | 45% | 6 h 30 min |
| December 13 | 35°F | 26°F | 69% | 45% | 6 h 30 min |
| December 14 | 35°F | 26°F | 68% | 45% | 6 h 30 min |
| December 15 | 35°F | 26°F | 68% | 45% | 6 h 30 min |
| December 16 | 35°F | 26°F | 68% | 45% | 6 h 20 min |
| December 17 | 35°F | 26°F | 68% | 45% | 6 h 20 min |
| December 18 | 35°F | 26°F | 68% | 44% | 6 h 20 min |
| December 19 | 34°F | 26°F | 68% | 44% | 6 h 20 min |
| December 20 | 34°F | 26°F | 68% | 44% | 6 h 20 min |
| December 21 | 34°F | 25°F | 68% | 44% | 6 h 20 min |
| December 22 | 34°F | 25°F | 67% | 44% | 6 h 20 min |
| December 23 | 34°F | 25°F | 67% | 44% | 6 h 20 min |
| December 24 | 34°F | 25°F | 67% | 44% | 6 h 20 min |
| December 25 | 34°F | 25°F | 67% | 44% | 6 h 20 min |
| December 26 | 34°F | 25°F | 67% | 44% | 6 h 20 min |
| December 27 | 34°F | 25°F | 67% | 44% | 6 h 20 min |
| December 28 | 33°F | 25°F | 67% | 44% | 6 h 20 min |
| December 29 | 33°F | 25°F | 67% | 44% | 6 h 30 min |
| December 30 | 33°F | 24°F | 66% | 43% | 6 h 30 min |
| December 31 | 33°F | 24°F | 66% | 43% | 6 h 30 min |
- Normal high
- 35°FDecember average
- Normal low
- 26°FDecember average
- Precipitation
- 6.53 inmonth total
- Days with precipitation
- 210.01 inch or more
- Snowfall
- 18.1 inmonth total
- Nights at 32°F or colder
- 21
- Daylight
- 7 h to 6 h 30 minDecember 1 to December 31
- Sunshine
- 47%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00025309; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Juneau in December?
On a given December day the chance of 0.01 inch or more is 68% on average, highest around December 1 (69%). In all, 6.53 in falls on 21 days of a normal December, 1 of them with an inch or more.
In a normal December in Juneau, 21 nights fall to freezing, 10 days stay below freezing all day and snowfall averages 18.1 inches.
Snow falls on 10 days in a normal December, and an inch or more covers the ground on 14 days.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00025309.
How humid and windy is Juneau in December?
At 3 p.m. the normal temperature is 31°F with 83% relative humidity and a dew point of 26°F; at 6 a.m. it is 28°F with 85% humidity. The wind averages 7.3 mph, most often from the east in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 28°F | 24°F | 85% | 7.4 mph | – |
| 9 a.m. | 29°F | 25°F | 86% | 7.2 mph | 15% |
| noon | 31°F | 26°F | 82% | 7.8 mph | – |
| 3 p.m. | 31°F | 26°F | 83% | 7.8 mph | 15% |
| 6 p.m. | 30°F | 26°F | 85% | 7.3 mph | – |
| 9 p.m. | 29°F | 25°F | 84% | 7.2 mph | 20% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00025309. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for December in Juneau?
The warmest December temperature on Juneau's official record (since 1943) is 54°F, on December 12, 1944; the coldest is −21°F, on December 31, 1949. The wettest December brought 13.61 in (1997); the snowiest, 82.0 inches (2025).
The December mean against the 1991-2020 normal of 30.3°F: 2021 21.3°F (−9.0), 2022 25.4°F (−4.9), 2023 35.9°F (+5.6), 2024 33.3°F (+3.0), 2025 17.9°F (−12.4). 2 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 21.3°F | −9.0°F | 2.87 in |
| 2022 | 25.4°F | −4.9°F | 3.47 in |
| 2023 | 35.9°F | +5.6°F | 10.68 in |
| 2024 | 33.3°F | +3.0°F | 7.54 in |
| 2025 | 17.9°F | −12.4°F | 6.31 in |
Source: records: ACIS, NWS threaded record JNUthr; recent months: ACIS, station USW00025309. Records and recent months use complete months only.
How does December in Juneau compare across Alaska?
Across the 85 places PlainClimate covers in Alaska, December normal highs run from −7°F in Chicken to 42°F in Sitka; Juneau's is 35°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.