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
During January and December, Juneau experiences its lowest temperatures, averaging a high-temperature of 25.7°F (-3.5°C).Humidity
In December, the average relative humidity is 90%.Rainfall
In Juneau, in December, it is raining for 5.8 days, with typically 8.98" (228mm) of accumulated precipitation. In Juneau, during the entire year, the rain falls for 172.4 days and collects up to 85.87" (2181mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. December is the month with the most snowfall. Snow falls for 21.8 days and accumulates 62.8" (1595mm) of snow.Ocean temperature
In Juneau, in December, the average water temperature is 43.3°F (6.3°C).Note: Danger awaits those who swim in 43.3°F (6.3°C) without protection. Falling below 50°F (10°C) means intense cold shock and hyperventilation.
Daylight
The month with the shortest days is December, with an average of 6h and 30min of daylight.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 December, the average sunshine 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 of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for the average person.Note: A daily high UV index of 1 in December leads to these guidelines:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month?
How cold is it in December?
What is the average humidity in December?
How many days does it rain in December?
What is the snowiest month?
How much 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?
What time are sunrise and sunset in December?
How many hours of sunshine does Juneau have in December?
What is the month with 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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