Petersburg
Alaska, USA
Long-term weather forecast
Long-term weather forecast

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
The first month of the winter, December, is still a cold month in Petersburg, Alaska, with average temperature fluctuating between 26.4°F (-3.1°C) and 36°F (2.2°C).

Temperature

In December, the average high-temperature is practically the same as in November - a still wintry 36°F (2.2°C). In December, the average low-temperature is 26.4°F (-3.1°C).

Ocean temperature

In Petersburg, the average water temperature is 44.2°F (6.8°C).
Note: 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.

Daylight

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

What is the temperature in December in Petersburg?

In December, in Petersburg, Alaska, the average high-temperature is 36°F (2.2°C), and the average low-temperature is 26.4°F (-3.1°C).

How cold is the water in December in Petersburg?

In Petersburg, in December, the average water temperature is 44.2°F (6.8°C). Swimming in 44.2°F (6.8°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the month with the shortest days in Petersburg?

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

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.
Average temperature in December - Petersburg, AK
  • Average high temperature in December: 35.9°F

The warmest month (with the highest average high temperature) is July (63.9°F).
The month with the lowest average high temperature is January (34.9°F).

  • Average low temperature in December: 26.5°F

The month with the highest average low temperature is July (48°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).

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).

Average daylight 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 shortest days is December (Average daylight: 6.9h).