December weather forecastSaint Mary's, AK
December
Weather in December
December, the first month of the winter in Saint Mary's, is still a freezing cold month, with an average temperature fluctuating between 14.7°F (-9.6°C) and 5.9°F (-14.5°C).Temperature
During the shift to December, Saint Mary's records a mild decrease in average high-temperature, moving from 21.6°F (-5.8°C) in November to a still freezing cold 14.7°F (-9.6°C). Nighttime temperatures record an average of 5.9°F (-14.5°C) throughout December.Humidity
January through March and December, with an average relative humidity of 91%, are the most humid months.Rainfall
In Saint Mary's, in December, during 2.7 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. Throughout the year, there are 104.5 rainfall days, and 15.75" (400mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. In December, it is snowing for 10.5 days. Throughout December, 3.78" (96mm) of snow is accumulated. In Saint Mary's, during the entire year, snow falls for 71.4 days and aggregates up to 22.72" (577mm) of snow.Daylight
With an average of 5h and 18min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 10:48 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 11:15 am and sunset at 4:36 pm AKST.
Sunshine
December has the least sunshine of the year, with an average of 2.6h of sunshine.UV index
The months with the lowest UV index are March, November and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.Note: A maximum UV index of 1 in December translates into the following recommendations:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Opt for tightly woven and loose clothing to enhance protection from the Sun. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Saint Mary's, AK
- Average high temperature in December: 14.7°F
The warmest month (with the highest average high temperature) is July (61.5°F).
The month with the lowest average high temperature is January (11.3°F).
- Average low temperature in December: 5.9°F
The month with the highest average low temperature is July (47.5°F).
The coldest month (with the lowest average low temperature) is January (2.3°F).
Average pressure in December
Saint Mary's, AK
- Average pressure in December: 29.67"Hg
The month with the highest atmospheric pressure is July (29.91"Hg).
The months with the lowest atmospheric pressure are October and December (29.67"Hg).
Average wind speed in December
Saint Mary's, AK
- Average wind speed in December: 11.4mph
The windiest month (with the highest average wind speed) is February (11.9mph).
The calmest month (with the lowest average wind speed) is July (8.9mph).
Average humidity in December
Saint Mary's, AK
- Average humidity in December: 91%
The months with the highest relative humidity are January, February, March and December (91%).
The month with the lowest relative humidity is June (66%).
Average rainfall in December
Saint Mary's, AK
- Average rainfall in December: 1.14"
The wettest month (with the highest rainfall) is August (2.13").
The driest months (with the least rainfall) are January and June (0.87").
Average rainfall days in December
Saint Mary's, AK
- Average rainfall days in December: 2.7 days
The month with the highest number of rainy days is August (17.8 days).
The months with the least rainy days are January and February (2.4 days).
Average snowfall in December
Saint Mary's, AK
- Average snowfall in December: 3.78"
The month with the highest snowfall is February (5.28").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Saint Mary's, AK
- Average snowfall days in December: 10.5 days
The month with the highest number of snowfall days is February (11.4 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Saint Mary's, AK
- Average daylight in December: 5h and 18min
The month with the longest days is June (Average daylight: 19h and 36min).
The month with the shortest days is December (Average daylight: 5h and 18min).
- Average sunshine in December: 2h and 36min
The month with the most sunshine is May (Average sunshine: 7h and 54min).
The month with the least sunshine is December (Average sunshine: 2h and 36min).
Average sunshine days in December
Saint Mary's, AK
- Average sunshine days in December: 17.5 days
The month with the most sunshine days is March (19.5 days).
The month with the least sunshine days is August (10.9 days).
Average UV index in December
Saint Mary's, AK
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 3).
The months with the lowest UV index are March, November and December (UV index 1).
Average cloud cover in December
Saint Mary's, AK
- Average cloud cover in December: 64
The month with the most cloud cover is July (Cloud cover 68).
The month with the least cloud cover is June (Cloud cover 54).
Average visibility in December
Saint Mary's, AK
- Average visibility in December: 5mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April, November and December (5mi).
