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 December, the average high-temperature is a still cold 37°F (2.8°C), maintaining a close resemblance to that of the preceding month. Unalaska's December nights demonstrate minimal variation from the daytime temperatures, with an average of 33.8°F (1°C).Humidity
November and December, with an average relative humidity of 80%, are the least humid months in Unalaska.Rainfall
The month with the most rainfall in Unalaska, Alaska, is December, when the rain falls for 15.3 days and typically aggregates up to 4.21" (107mm) of precipitation.Snowfall
Months with snowfall in Unalaska are January through May, October through December. In Unalaska, in December, during 12.9 snowfall days, 5.43" (138mm) of snow is typically accumulated. In Unalaska, during the entire year, snow falls for 78.3 days and aggregates up to 30.39" (772mm) of snow.Ocean temperature
In Unalaska, in December, the average water temperature is 41.5°F (5.3°C).Note: In 41.5°F (5.3°C), even brief exposure to 55.4°F (13°C) feels biting, and anything less than 50°F (10°C) risks cold shock and impaired breathing, considering one's health.
Daylight
December has the shortest days of the year in Unalaska, Alaska, with an average of 7h and 30min of daylight.On the first day of the month, sunrise is at 10:02 am and sunset at 5:48 pm. On the last day of December, sunrise is at 10:24 am and sunset at 5:54 pm AKST.
Sunshine
With an average of 2h of sunshine, December has the least sunshine of the year.UV index
In Unalaska, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the average person.Note: The maximum UV index of 2 during December translates into these guidelines:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Frequently asked questions
How cold is December in Unalaska?
What is the least humid month in Unalaska?
What is the average humidity in December in Unalaska?
What is the wettest month in Unalaska?
How many days does it rain in December in Unalaska?
How many days does it snow in December in Unalaska?
How cold is the water in December in Unalaska?
What is the month with the shortest days in Unalaska?
How many hours of daylight does Unalaska have in December?
When are sunrise and sunset in December in Unalaska?
What is the month with the least sunshine in Unalaska?
How long on average sun shines in December in Unalaska?
How high is the UV index in December in Unalaska?
Average temperature in December
Unalaska, AK
- Average high temperature in December: 37°F
The warmest month (with the highest average high temperature) is August (53.2°F).
The month with the lowest average high temperature is March (34.7°F).
- Average low temperature in December: 33.8°F
The month with the highest average low temperature is August (49.6°F).
The coldest month (with the lowest average low temperature) is March (30.7°F).
Average pressure in December
Unalaska, AK
- Average pressure in December: 29.52"Hg
The month with the highest atmospheric pressure is July (29.98"Hg).
The month with the lowest atmospheric pressure is January (29.5"Hg).
Average wind speed in December
Unalaska, AK
- Average wind speed in December: 16.5mph
The windiest months (with the highest average wind speed) are November and December (16.5mph).
The calmest month (with the lowest average wind speed) is July (9.1mph).
Average humidity in December
Unalaska, AK
- Average humidity in December: 80%
The month with the highest relative humidity is July (91%).
The months with the lowest relative humidity are November and December (80%).
Average rainfall in December
Unalaska, AK
- Average rainfall in December: 4.21"
The wettest month (with the highest rainfall) is December (4.21").
The driest month (with the least rainfall) is July (1.85").
Average rainfall days in December
Unalaska, AK
- Average rainfall days in December: 15.3 days
The month with the highest number of rainy days is October (21.8 days).
The month with the least rainy days is February (11.1 days).
Average snowfall in December
Unalaska, AK
- Average snowfall in December: 5.43"
The month with the highest snowfall is January (6.97").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Unalaska, AK
- Average snowfall days in December: 12.9 days
The month with the highest number of snowfall days is January (14.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in December
Unalaska, AK
- Average sea temperature in December: 41.5°F
The best month for swimming (with the highest average sea temperature) is August (50.1°F).
The coldest month (with the lowest average sea temperature) is February (38.8°F).
Average daylight in December /
Average sunshine in December
Unalaska, AK
- Average daylight in December: 7h and 3min
The month with the longest days is June (Average daylight: 17h and 0min).
The month with the shortest days is December (Average daylight: 7h and 30min).
- Average sunshine in December: 2h and 0min
The month with the most sunshine is June (Average sunshine: 5h and 48min).
The month with the least sunshine is December (Average sunshine: 2h and 0min).
Average sunshine days in December
Unalaska, AK
- Average sunshine days in December: 4.1 days
The month with the most sunshine days is August (9.7 days).
The month with the least sunshine days is April (3.8 days).
Average UV index in December
Unalaska, AK
- Average UV index in December: 2
The months with the highest UV index are July and August (UV index 3).
The months with the lowest UV index are February, March, April and November (UV index 1).
Average cloud cover in December
Unalaska, AK
- Average cloud cover in December: 72
The month with the most cloud cover is July (Cloud cover 74).
The months with the least cloud cover are September and October (Cloud cover 66).
Average visibility in December
Unalaska, AK
- Average visibility in December: 5mi
The months with the highest visibility are May, June, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March, April, July and December (5mi).
Unalaska, Alaska, USA
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