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 the beginning of December, the average high-temperature shows a decrease, transitioning from a frosty 43.5°F (6.4°C) in November to a freezing cold 31.8°F (-0.1°C). During the nights in December, the temperature averages to 21°F (-6.1°C).Humidity
In December, the average relative humidity is 80%.Rainfall
In December, in Casco, the rain falls for 10.5 days. Throughout December, 3.15" (80mm) of precipitation is accumulated. Throughout the year, there are 156.2 rainfall days, and 31.02" (788mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Casco, in December, snow falls for 9.5 days, with typically accumulated 6.89" (175mm) of snow. In Casco, during the entire year, snow falls for 54.7 days and aggregates up to 40.2" (1021mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 0min of daylight.On the first day of December, sunrise is at 6:57 am and sunset at 4:05 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 4:14 pm EST.
Sunshine
In Casco, the average sunshine in December is 4.8h.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 health risk from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 2 during December translates into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
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 much does it rain in December?
How many days does it snow in December in Casco?
What is the month with the shortest days in Casco?
How many hours of daylight does Casco have in December?
What time are sunrise and sunset in December in Casco?
How many hours of sunshine does Casco have in December?
What are the months with the lowest UV index in Casco?
What is the UV index reading in December?
Average temperature in December
Casco, ME
- Average high temperature in December: 31.8°F
The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (26.2°F).
- Average low temperature in December: 21°F
The month with the highest average low temperature is July (57°F).
The coldest month (with the lowest average low temperature) is January (11.8°F).
Average pressure in December
Casco, ME
- Average pressure in December: 30.02"Hg
The months with the highest atmospheric pressure are September and November (30.05"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Casco, ME
- Average wind speed in December: 5.8mph
The windiest months (with the highest average wind speed) are March and April (6.3mph).
The calmest month (with the lowest average wind speed) is August (4.4mph).
Average humidity in December
Casco, ME
- Average humidity in December: 80%
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is November (76%).
Average rainfall in December
Casco, ME
- Average rainfall in December: 3.15"
The wettest month (with the highest rainfall) is October (3.31").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days in December
Casco, ME
- Average rainfall days in December: 10.5 days
The month with the highest number of rainy days is June (16.6 days).
The month with the least rainy days is February (8.3 days).
Average snowfall in December
Casco, ME
- Average snowfall in December: 6.89"
The month with the highest snowfall is February (10.24").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Casco, ME
- Average snowfall days in December: 9.5 days
The month with the highest number of snowfall days is March (12.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Casco, ME
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in December
Casco, ME
- Average sunshine days in December: 13.9 days
The months with the most sunshine days are September and November (16.7 days).
The months with the least sunshine days are April and June (10.6 days).
Average UV index in December
Casco, 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
Casco, ME
- Average cloud cover in December: 49
The months with the most cloud cover are February and March (Cloud cover 51).
The months with the least cloud cover are August and September (Cloud cover 37).
Average visibility in December
Casco, ME
- Average visibility in December: 5mi
The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (5mi).
The month with the lowest visibility is February (4mi).
Casco, Maine, USA
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