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
With average temperatures fluctuating between a high of 32.4°F (0.2°C) and a low of 27.5°F (-2.5°C), December stands out as the coldest month.Humidity
In December, the average relative humidity is 83%.Rainfall
In Saint John Harbor, in December, it is raining for 14.6 days, with typically 4.65" (118mm) of accumulated precipitation. 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 December, in Saint John Harbor, it is snowing for 8.4 days. Throughout December, 10.67" (271mm) of snow is accumulated. In Saint John Harbor, during the entire year, snow falls for 47.5 days and aggregates up to 58.23" (1479mm) of snow.Daylight
The month with the shortest days is December, with an average of 7h and 0min of daylight.On the first day of December in Saint John Harbor, sunrise is at 8:02 am and sunset at 3:19 pm. On the last day of the month, sunrise is at 8:25 am and sunset at 3:24 pm AKST.
Sunshine
The average sunshine in December is 3.8h.UV index
November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.Note: A maximum high UV index of 1 in December translates into the following recommendations:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Stay sun-safe with clothing that is both closely woven and worn loosely. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest?
How cold is December?
What is the average humidity in December?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
How many hours of sunshine does Saint John Harbor have in December?
What is the month with the lowest UV index?
How high is the UV index in December?
Average temperature in December
Saint John Harbor, 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).
Average pressure in December
Saint John Harbor, AK
- Average pressure in December: 29.88"Hg
The month with the highest atmospheric pressure is July (30.05"Hg).
The month with the lowest atmospheric pressure is November (29.8"Hg).
Average wind speed in December
Saint John Harbor, 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).
Average humidity in December
Saint John Harbor, AK
- Average humidity in December: 83%
The months with the highest relative humidity are January and August (86%).
The month with the lowest relative humidity is May (81%).
Average rainfall in December
Saint John Harbor, 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").
Average rainfall days in December
Saint John Harbor, 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).
Average snowfall in December
Saint John Harbor, AK
- Average snowfall in December: 10.67"
The month with the highest snowfall is March (13.46").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Saint John Harbor, AK
- Average snowfall days in December: 8.4 days
The month with the highest number of snowfall days is March (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Saint John Harbor, AK
- Average daylight in December: 7h and 0min
The month with the longest days is June (Average daylight: 17h and 36min).
The month with the shortest days is December (Average daylight: 7h and 0min).
- Average sunshine in December: 3h and 5min
The month with the most sunshine is May (Average sunshine: 7h and 24min).
The months with the least sunshine are January and November (Average sunshine: 3h and 24min).
Average sunshine days in December
Saint John Harbor, 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).
Average UV index in December
Saint John Harbor, AK
- Average UV index in December: 1
The months with the highest UV index are July and August (UV index 4).
The months with the lowest UV index are November and December (UV index 1).
Average cloud cover in December
Saint John Harbor, AK
- Average cloud cover in December: 59
The month with the most cloud cover is January (Cloud cover 66).
The months with the least cloud cover are February and May (Cloud cover 54).
Average visibility in December
Saint John Harbor, AK
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Saint John Harbor, Alaska, USA
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