December weather forecast and climate
Petersburg, AK

Colorful buildings, docked ships in Quaint fishing village in Petersburg, Alaska, on Mitkof Island
Colorful buildings, docked ships in Quaint fishing village in Petersburg, Alaska, on Mitkof Island

Weather in December

December, the first month of the winter, in Petersburg, is also a wintry month, with average temperature ranging between max 32.4°F (0.2°C) and min 27.5°F (-2.5°C).

Temperature

With an average high-temperature of 32.4°F (0.2°C) and an average low-temperature of 27.5°F (-2.5°C), December is the coldest month.

Humidity

In Petersburg, the average relative humidity is 83%.

Rainfall

In December, the rain falls for 14.6 days. Throughout December, 4.65" (118mm) of precipitation is accumulated. Throughout the year, there are 197.9 rainfall days, and 53.03" (1347mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall in Petersburg. In Petersburg, during December, snow falls for 8.4 days and regularly aggregates up to 10.67" (271mm) of snow. Throughout the year, in Petersburg, Alaska, there are 47.5 snowfall days, and 58.23" (1479mm) of snow is accumulated.

Ocean temperature

In Petersburg, Alaska, in December, the average water temperature is 44.2°F (6.8°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

The month with the shortest days is December, with an average of 6.9h of daylight.

Sunshine

In December, the average sunshine is 3.8h.

UV index

Months with the lowest UV index are November and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low health risk from the exposure to the Sun's UV radiation for average individuals.
Note: In December, the average maximum UV index of 1 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Petersburg?

With an average high-temperature of 32.4°F (0.2°C) and an average low-temperature of 27.5°F (-2.5°C), December is the coldest month in Petersburg, Alaska.

What is the temperature in December in Petersburg?

In December, in Petersburg, the average high-temperature is 32.4°F (0.2°C), and the average low-temperature is 27.5°F (-2.5°C).

What is the average humidity in December in Petersburg?

In December, the average relative humidity in Petersburg is 83%.

How many days does it rain in December in Petersburg?

In Petersburg, during December, the rain falls for 14.6 days and regularly aggregates up to 4.65" (118mm) of precipitation.

How many days does it snow in December in Petersburg?

In December, in Petersburg, it is snowing for 8.4 days. Throughout December, 10.67" (271mm) of snow is accumulated.

What is the water temperature in December in Petersburg?

In Petersburg, Alaska, the average seawater temperature in December is 44.2°F (6.8°C). Swimming in 44.2°F (6.8°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the month with the shortest days in Petersburg?

December has the shortest days of the year, with an average of 6.9h of daylight.

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

In Petersburg, the average length of the day in December is 6.9h.

How long on average sun shines in December in Petersburg?

In December, the average sunshine is 3.8h.

When is the lowest UV index in Petersburg?

November and December, with an average maximum UV index of 1, are months with the lowest UV index in Petersburg, Alaska.

How high is the UV index in December in Petersburg?

In December, the average daily maximum UV index in Petersburg is 1. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to the Sun's UV rays.

Average temperature in December
Petersburg, AK

Average temperature in December - Petersburg, AK
  • Average high temperature in December: 32.4°F

The warmest month (with the highest average high temperature) is July (59.7°F).
The month with the lowest average high temperature is December (32.4°F).

  • Average low temperature in December: 27.5°F

The month with the highest average low temperature is July (50.2°F).
The coldest month (with the lowest average low temperature) is February (25.9°F).

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Average pressure in December
Petersburg, AK

Average pressure in December - Petersburg, AK
  • Average pressure in December: 29.88"

The month with the highest atmospheric pressure is July (30.05").
The month with the lowest atmospheric pressure is November (29.8").

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Average wind speed in December
Petersburg, AK

Average wind speed in December - Petersburg, AK
  • Average wind speed in December: 7.7mph

The windiest month (with the highest average wind speed) is January (8.2mph).
The calmest month (with the lowest average wind speed) is July (3.9mph).

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Average humidity in December
Petersburg, AK

Average humidity in December - Petersburg, AK
  • Average humidity in December: 83%

Months with the highest relative humidity are January and August (86%).
The month with the lowest relative humidity is May (81%).

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Average rainfall in December
Petersburg, AK

Average rainfall in December - Petersburg, AK
  • Average rainfall in December: 4.65"

The wettest month (with the highest rainfall) is October (6.3").
The driest month (with the least rainfall) is May (2.01").

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Average rainfall days in December
Petersburg, AK

Average rainfall days in December - Petersburg, AK
  • Average rainfall days in December: 14.6 days

The month with the highest number of rainy days is October (20.1 days).
The month with the least rainy days is February (9.5 days).

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Average snowfall in December
Petersburg, AK

Average snowfall in December - Petersburg, AK
  • Average snowfall in December: 10.67"

The month with the highest snowfall is March (13.46").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Petersburg, AK

Average snowfall days in December - Petersburg, AK
  • Average snowfall days in December: 8.4 days

The month with the highest number of snowfall days is March (10.8 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in December
Petersburg, AK

Average sea temperature in December - Petersburg, AK
  • Average sea temperature in December: 44.3°F

The best month for swimming (with the highest average sea temperature) is August (54.2°F).
The coldest month (with the lowest average sea temperature) is March (41°F).

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

Average daylight in December / Average sunshine in December - Petersburg, AK
  • Average daylight in December: 6.9h

The month with the longest days is June (Average daylight: 17.7h).
The month with the shortest days is December (Average daylight: 6.9h).

  • Average sunshine in December: 3.8h

The month with the most sunshine is May (Average sunshine: 7.4h).
Months with the least sunshine are January and November (Average sunshine: 3.4).

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Average sunshine days in December
Petersburg, AK

Average sunshine days in December - Petersburg, AK
  • Average sunshine days in December: 12.5 days

The month with the most sunshine days is December (12.5 days).
The month with the least sunshine days is November (8 days).

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Average UV index in December
Petersburg, AK

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

Months with the highest UV index are July and August (UV index 4).
Months with the lowest UV index are November and December (UV index 1).

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Average cloud cover in December
Petersburg, AK

Average cloud cover in December - Petersburg, AK
  • Average cloud cover in December: 59

The month with the most cloud cover is January (Cloud cover 66).
Months with the least cloud cover are February and May (Cloud cover 54).

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Average visibility in December
Petersburg, AK

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

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

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