December weather forecast and climate
Sitka, AK

The glacial carved Three Sisters Mountains in Sitka, Alaska
The glacial carved Three Sisters Mountains in Sitka, Alaska

Weather in December

The first month of the winter, December, is still a cold month in Sitka, Alaska, with temperature in the range of an average low of 31.1°F (-0.5°C) and an average high of 35.6°F (2°C).

Temperature

In Sitka, Alaska, the average high-temperature in December is essentially the same as in November - a still wintry 35.6°F (2°C). In Sitka, in December, the average low-temperature is 31.1°F (-0.5°C).

Humidity

In Sitka, Alaska, the average relative humidity in December is 85%.

Rainfall

In Sitka, during December, the rain falls for 19.2 days and regularly aggregates up to 9.33" (237mm) of precipitation. In Sitka, during the entire year, the rain falls for 243.6 days and collects up to 82.76" (2102mm) of precipitation.

Snowfall

Months with snowfall in Sitka are January through May, October through December. In Sitka, Alaska, during 9.5 snowfall days, 10.04" (255mm) of snow is typically accumulated. In Sitka, during the entire year, snow falls for 52.4 days, and aggregates up to 63.58" (1615mm) of snow.

Daylight

December has the shortest days of the year in Sitka, with an average of 6.8h of daylight.

Sunshine

In December, the average sunshine is 3.2h.

UV index

January, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Sitka. A UV Index reading of 2, and below, represents a low threat to health from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 1 in December interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in December in Sitka?

In December, in Sitka, Alaska, the average high-temperature is 35.6°F (2°C), and the average low-temperature is 31.1°F (-0.5°C).

What is the average humidity in December in Sitka?

In December, the average relative humidity in Sitka is 85%.

How many days does it rain in December in Sitka?

In Sitka, Alaska, in December, it is raining for 19.2 days, with typically 9.33" (237mm) of accumulated precipitation.

How many days does it snow in December in Sitka?

In Sitka, in December, snow falls for 9.5 days, with typically accumulated 10.04" (255mm) of snow.

What is the month with the shortest days in Sitka?

The month with the shortest days in Sitka, Alaska, is December, with an average of 6.8h of daylight.

What is the average length of the day in December in Sitka?

In December, the average length of the day in Sitka, Alaska, is 6.8h.

How long on average sun shines in December in Sitka?

In Sitka, the average sunshine in December is 3.2h.

What are the months with the lowest UV index in Sitka?

Months with the lowest UV index are January, November and December, with an average maximum UV index of 1.

What is the UV index reading in December in Sitka?

In December, the average daily maximum UV index in Sitka, Alaska, is 1. A UV Index of 2, and less, symbolizes a minimal hazard to health from the exposure to the Sun's UV rays.

Average temperature in December
Sitka, AK

Average temperature in December - Sitka, AK
  • Average high temperature in December: 35.6°F

The warmest month (with the highest average high temperature) is August (57.9°F).
The month with the lowest average high temperature is January (34.7°F).

  • Average low temperature in December: 31.1°F

The month with the highest average low temperature is August (51.1°F).
The coldest month (with the lowest average low temperature) is February (29.7°F).

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Average pressure in December
Sitka, AK

Average pressure in December - Sitka, AK
  • Average pressure in December: 29.8"

The month with the highest atmospheric pressure is July (30.05").
The month with the lowest atmospheric pressure is November (29.72").

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Average wind speed in December
Sitka, AK

Average wind speed in December - Sitka, AK
  • Average wind speed in December: 9.3mph

The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is July (5.2mph).

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Average humidity in December
Sitka, AK

Average humidity in December - Sitka, AK
  • Average humidity in December: 85%

The month with the highest relative humidity is August (89%).
Months with the lowest relative humidity are February and March (83%).

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Average rainfall in December
Sitka, AK

Average rainfall in December - Sitka, AK
  • Average rainfall in December: 9.33"

The wettest month (with the highest rainfall) is November (10.16").
The driest month (with the least rainfall) is May (3.82").

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Average rainfall days in December
Sitka, AK

Average rainfall days in December - Sitka, AK
  • Average rainfall days in December: 19.2 days

The month with the highest number of rainy days is October (23.5 days).
The month with the least rainy days is February (14.6 days).

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Average snowfall in December
Sitka, AK

Average snowfall in December - Sitka, AK
  • Average snowfall in December: 10.04"

The month with the highest snowfall is March (17.72").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Sitka, AK

Average snowfall days in December - Sitka, AK
  • Average snowfall days in December: 9.5 days

The month with the highest number of snowfall days is March (14.1 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Sitka, AK

Average daylight in December / Average sunshine in December - Sitka, AK
  • Average daylight in December: 6.8h

The month with the longest days is June (Average daylight: 17.8h).
The month with the shortest days is December (Average daylight: 6.8h).

  • Average sunshine in December: 3.2h

The month with the most sunshine is May (Average sunshine: 6.5h).
The month with the least sunshine is January (Average sunshine: 2.7h).

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Average sunshine days in December
Sitka, AK

Average sunshine days in December - Sitka, AK
  • Average sunshine days in December: 6.2 days

The month with the most sunshine days is May (8.8 days).
The month with the least sunshine days is June (4.8 days).

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Average UV index in December
Sitka, AK

Average UV index in December - Sitka, AK
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 4).
Months with the lowest UV index are January, November and December (UV index 1).

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Average cloud cover in December
Sitka, AK

Average cloud cover in December - Sitka, AK
  • Average cloud cover in December: 68

The month with the most cloud cover is January (Cloud cover 72).
Months with the least cloud cover are February, May and September (Cloud cover 60).

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Average visibility in December
Sitka, AK

Average visibility in December - Sitka, AK
  • Average visibility in December: 6mi

Months with the highest visibility are February, March, April, May, September, October, November and December (6mi).
Months with the lowest visibility are January, June, July and August (5mi).

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