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 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
Start of December brings a slight shift in the average high-temperature, dipping a bit from November's subzero cold 21.6°F (-5.8°C) to a still freezing cold 14.7°F (-9.6°C). Nighttime temperatures in Saint Mary's record an average of 5.9°F (-14.5°C) throughout December.Humidity
The months with the highest humidity are January through March and December, with an average relative humidity of 91%.Rainfall
In December, the rain falls for 2.7 days. Throughout December, 1.14" (29mm) of precipitation is accumulated. Throughout the year, in Saint Mary's, 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 Saint Mary's, in December, during 10.5 snowfall days, 3.78" (96mm) of snow is typically 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
The month with the shortest days in Saint Mary's is December, with an average of 5h and 18min of daylight.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 of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for average individuals.Note: The maximum UV index, 1 during December, leads to the following recommendations:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
How cold is December in Saint Mary's?
What are the most humid months in Saint Mary's?
What is the average humidity in December in Saint Mary's?
How much does it rain in Saint Mary's in December?
How many days does it snow in December in Saint Mary's?
What is the month with the shortest days in Saint Mary's?
What is the average length of the day in December in Saint Mary's?
When are sunrise and sunset in December in Saint Mary's?
What is the month with the least sunshine in Saint Mary's?
How long on average sun shines in December in Saint Mary's?
When is the lowest UV index in Saint Mary's?
What is the UV index intensity in December in Saint Mary's?
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 2min
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 4min
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).
Saint Mary's, Alaska, USA
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