Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average sea temperature in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The months of January and December bring the lowest temperatures, averaging a high of 25.7°F (-3.5°C).Humidity
The average relative humidity in December is 90%.Rainfall
In Juneau, in December, during 5.8 rainfall days, 8.98" (228mm) of precipitation is typically accumulated. In Juneau, during the entire year, the rain falls for 172.4 days and collects up to 85.87" (2181mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Juneau, Alaska. The month with the most snowfall is December, when snow falls for 21.8 days and typically aggregates up to 62.8" (1595mm) of snow.Ocean temperature
In Juneau, in December, the average water temperature is 43.3°F (6.3°C).Note: It is life-risking to swim in 43.3°F (6.3°C). Briefly staying in 55.4°F (13°C) waters feels unsettling, and temperatures below 50°F (10°C) might result in cold shock and loss of breath control, hinging on personal endurance.
Daylight
With an average of 6h and 30min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 8:21 am and sunset at 3:12 pm. On the last day of December, sunrise is at 8:45 am and sunset at 3:16 pm AKST.
Sunshine
In Juneau, the average sunshine in December is 2.9h.UV index
The months with the lowest UV index are January, April, October through December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: In December, a daily UV index of 1 turns into the following recommendations:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest?
How cold is December?
What is the average humidity in December?
How many days does it rain in December?
When does it snow the most?
How many days does it snow in December?
How cold is the water in December?
What is the month with the shortest days?
How many hours of daylight does Juneau have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Juneau have in December?
When is the lowest UV index?
How high is the UV index in December?
Average temperature in December
Juneau, AK
- Average high temperature in December: 25.7°F
The warmest month (with the highest average high temperature) is July (55.8°F).
The months with the lowest average high temperature are January and December (25.7°F).
- Average low temperature in December: 19°F
The month with the highest average low temperature is July (45.1°F).
The coldest month (with the lowest average low temperature) is February (17.1°F).
Average pressure in December
Juneau, AK
- Average pressure in December: 29.87"Hg
The month with the highest atmospheric pressure is July (30.03"Hg).
The month with the lowest atmospheric pressure is November (29.8"Hg).
Average wind speed in December
Juneau, AK
- Average wind speed in December: 6.5mph
The windiest month (with the highest average wind speed) is January (6.9mph).
The calmest months (with the lowest average wind speed) are June and July (3.7mph).
Average humidity in December
Juneau, AK
- Average humidity in December: 90%
The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is May (86%).
Average rainfall in December
Juneau, AK
- Average rainfall in December: 8.98"
The wettest month (with the highest rainfall) is October (9.88").
The driest month (with the least rainfall) is May (4.13").
Average rainfall days in December
Juneau, AK
- Average rainfall days in December: 5.8 days
The month with the highest number of rainy days is September (21.9 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in December
Juneau, AK
- Average snowfall in December: 62.8"
The month with the highest snowfall is December (62.8").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Juneau, AK
- Average snowfall days in December: 21.8 days
The month with the highest number of snowfall days is January (21.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in December
Juneau, AK
- Average sea temperature in December: 43.3°F
The best month for swimming (with the highest average sea temperature) is August (53.5°F).
The coldest month (with the lowest average sea temperature) is March (40.3°F).
Average daylight in December /
Average sunshine in December
Juneau, AK
- Average daylight in December: 6h and 3min
The month with the longest days is June (Average daylight: 18h and 12min).
The month with the shortest days is December (Average daylight: 6h and 30min).
- Average sunshine in December: 2h and 5min
The month with the most sunshine is June (Average sunshine: 6h and 24min).
The month with the least sunshine is November (Average sunshine: 2h and 36min).
Average sunshine days in December
Juneau, AK
- Average sunshine days in December: 7.6 days
The month with the most sunshine days is May (10 days).
The month with the least sunshine days is November (6.1 days).
Average UV index in December
Juneau, AK
- Average UV index in December: 1
The months with the highest UV index are May and July (UV index 3).
The months with the lowest UV index are January, April, October, November and December (UV index 1).
Average cloud cover in December
Juneau, AK
- Average cloud cover in December: 71
The months with the most cloud cover are January and November (Cloud cover 72).
The month with the least cloud cover is May (Cloud cover 61).
Average visibility in December
Juneau, AK
- Average visibility in December: 4mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
Juneau, Alaska, USA
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