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 start of December signals a decrease in the average high-temperature, transitioning from a frosty 42.8°F (6°C) in November to a wintry 32.7°F (0.4°C). Nighttime temperature lowers to an average of 21.9°F (-5.6°C) in December.Humidity
In Calais, the average relative humidity in December is 83%.Rainfall
The month with the most rainfall is December, when the rain falls for 12.5 days and typically aggregates up to 3.7" (94mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Calais, in December, snow falls for 11.1 days, with typically accumulated 5.24" (133mm) of snow. In Calais, during the entire year, snow falls for 64.6 days and aggregates up to 30.47" (774mm) of snow.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 7:48 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 8:07 am and sunset at 4:56 pm AST.
Sunshine
The average sunshine in December is 4.1h.UV index
January through March, November and 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 health risk from exposure to the Sun's UV radiation for the ordinary person.Note: A daily maximum UV index of 2 in December translates into the following instructions:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
What is the rainiest month?
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 long on average sun shines in December?
What are the months with the lowest UV index in Calais?
How high is the UV index in December?
Average temperature in December
Calais, ME
- Average high temperature in December: 32.7°F
The warmest month (with the highest average high temperature) is July (74.8°F).
The month with the lowest average high temperature is January (26.6°F).
- Average low temperature in December: 21.9°F
The month with the highest average low temperature is July (56.8°F).
The coldest month (with the lowest average low temperature) is January (13.8°F).
Average pressure in December
Calais, ME
- Average pressure in December: 29.98"Hg
The month with the highest atmospheric pressure is September (30.03"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Calais, ME
- Average wind speed in December: 8.8mph
The windiest month (with the highest average wind speed) is March (9.3mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity in December
Calais, ME
- Average humidity in December: 83%
The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is May (78%).
Average rainfall in December
Calais, ME
- Average rainfall in December: 3.7"
The wettest month (with the highest rainfall) is December (3.7").
The driest month (with the least rainfall) is August (1.77").
Average rainfall days in December
Calais, ME
- Average rainfall days in December: 12.5 days
The month with the highest number of rainy days is April (17.2 days).
The month with the least rainy days is February (7.8 days).
Average snowfall in December
Calais, ME
- Average snowfall in December: 5.24"
The month with the highest snowfall is January (7.44").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Calais, ME
- Average snowfall days in December: 11.1 days
The month with the highest number of snowfall days is January (15.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Calais, 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 48min).
The month with the least sunshine is February (Average sunshine: 3h and 24min).
Average sunshine days in December
Calais, ME
- Average sunshine days in December: 12.5 days
The month with the most sunshine days is September (16.6 days).
The month with the least sunshine days is April (8.5 days).
Average UV index in December
Calais, 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, November and December (UV index 2).
Average cloud cover in December
Calais, ME
- Average cloud cover in December: 57
The month with the most cloud cover is February (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 38).
Average visibility in December
Calais, ME
- Average visibility in December: 6mi
The months with the highest visibility are May, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, June, July, August and September (5mi).
Calais, Maine, USA
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