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
The onset of December comes with a shift in the average high-temperature, falling from a cold 41°F (5°C) in November to a freezing cold 29.1°F (-1.6°C). During the nights in December, Charleston observes an average low-temperature of 18.7°F (-7.4°C).Humidity
The average relative humidity in December is 83%.Rainfall
In Charleston, in December, during 10.8 rainfall days, 3.23" (82mm) of precipitation is typically accumulated. Throughout the year, there are 154.3 rainfall days, and 32.68" (830mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Charleston, in December, snow falls for 12.4 days, with typically accumulated 9.06" (230mm) of snow. Throughout the year, there are 69.5 snowfall days, and 49.96" (1269mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 8h and 48min of daylight.On the first day of December, sunrise is at 6:55 am and sunset at 3:55 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 4:04 pm EST.
Sunshine
In December, the average sunshine is 4.2h.UV index
January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The daily high UV index of 2 in December translates into this advice:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Boost your sun resistance with garments that are densely woven yet spacious. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Charleston have in December?
What time are sunrise and sunset in December?
How long on average sun shines in December?
What are the months with the lowest UV index?
How high is the UV index in December?
Average temperature in December
Charleston, ME
- Average high temperature in December: 29.1°F
The warmest month (with the highest average high temperature) is July (77.2°F).
The month with the lowest average high temperature is January (23.9°F).
- Average low temperature in December: 18.7°F
The month with the highest average low temperature is July (55.9°F).
The coldest month (with the lowest average low temperature) is January (10.8°F).
Average pressure in December
Charleston, ME
- Average pressure in December: 30.01"Hg
The month with the highest atmospheric pressure is September (30.04"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Charleston, ME
- Average wind speed in December: 6.8mph
The windiest month (with the highest average wind speed) is March (7.5mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Charleston, ME
- Average humidity in December: 83%
The month with the highest relative humidity is February (88%).
The month with the lowest relative humidity is May (76%).
Average rainfall in December
Charleston, ME
- Average rainfall in December: 3.23"
The wettest month (with the highest rainfall) is April (3.54").
The driest month (with the least rainfall) is July (1.89").
Average rainfall days in December
Charleston, ME
- Average rainfall days in December: 10.8 days
The months with the highest number of rainy days are May and July (16.7 days).
The month with the least rainy days is February (6.8 days).
Average snowfall in December
Charleston, ME
- Average snowfall in December: 9.06"
The month with the highest snowfall is February (11.26").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Charleston, ME
- Average snowfall days in December: 12.4 days
The month with the highest number of snowfall days is February (15.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Charleston, ME
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 4h and 1min
The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).
Average sunshine days in December
Charleston, ME
- Average sunshine days in December: 13.9 days
The month with the most sunshine days is September (16.4 days).
The month with the least sunshine days is April (10.7 days).
Average UV index in December
Charleston, ME
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in December
Charleston, ME
- Average cloud cover in December: 54
The month with the most cloud cover is February (Cloud cover 59).
The months with the least cloud cover are August and September (Cloud cover 40).
Average visibility in December
Charleston, ME
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January, February and March (4mi).
Charleston, Maine, USA
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