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 sea temperature 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
Belfast's progression into December involves a drop in the average high-temperature, receding from a frosty 44.1°F (6.7°C) in November to an icy 34.2°F (1.2°C). December nights are marked by an average low-temperature of 24.1°F (-4.4°C).Humidity
In Belfast, the average relative humidity in December is 79%.Rainfall
December is the month with the most rainfall. Rain falls for 10.1 days and accumulates 2.72" (69mm) of precipitation.Snowfall
Months with snowfall in Belfast are January through May, October through December. In Belfast, in December, snow falls for 8.9 days, with typically accumulated 2.28" (58mm) of snow. Throughout the year, there are 44.3 snowfall days, and 16.81" (427mm) of snow is accumulated.Ocean temperature
In December, the average ocean temperature is 45.1°F (7.3°C).Note: Danger awaits those who swim in 45.1°F (7.3°C) without protection. Falling below 50°F (10°C) means intense cold shock and hyperventilation.
Daylight
December has the shortest days of the year, with an average of 8h and 54min of daylight.On the first day of December, sunrise is at 6:52 am and sunset at 3:57 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 4:06 pm EST.
Sunshine
In Belfast, the average sunshine in December is 4.4h.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 unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, a daily UV index of 2 turns into the following recommendations:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
What is the rainiest month in Belfast?
How much does it rain in December?
How much does it snow in December?
What is the water temperature in December?
What is the month with the shortest days?
How many hours of daylight does Belfast have in December?
What time are sunrise and sunset in December?
How many hours of sunshine does Belfast have in December?
What is the month with the lowest UV index in Belfast?
What is the UV index reading in December?
Average temperature in December
Belfast, ME
- Average high temperature in December: 34.2°F
The warmest months (with the highest average high temperature) are July and August (73.9°F).
The month with the lowest average high temperature is January (28.4°F).
- Average low temperature in December: 24.1°F
The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).
Average pressure in December
Belfast, ME
- Average pressure in December: 30"Hg
The month with the highest atmospheric pressure is September (30.04"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Belfast, ME
- Average wind speed in December: 9.6mph
The windiest month (with the highest average wind speed) is March (10.1mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity in December
Belfast, ME
- Average humidity in December: 79%
The months with the highest relative humidity are February and July (83%).
The month with the lowest relative humidity is November (77%).
Average rainfall in December
Belfast, ME
- Average rainfall in December: 2.72"
The wettest month (with the highest rainfall) is December (2.72").
The driest months (with the least rainfall) are July and September (1.46").
Average rainfall days in December
Belfast, ME
- Average rainfall days in December: 10.1 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is February (7.1 days).
Average snowfall in December
Belfast, ME
- Average snowfall in December: 2.28"
The month with the highest snowfall is January (4.57").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Belfast, ME
- Average snowfall days in December: 8.9 days
The month with the highest number of snowfall days is January (10.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in December
Belfast, ME
- Average sea temperature in December: 45°F
The best month for swimming (with the highest average sea temperature) is August (60.4°F).
The coldest month (with the lowest average sea temperature) is March (37.8°F).
Average daylight in December /
Average sunshine in December
Belfast, ME
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).
Average sunshine days in December
Belfast, ME
- Average sunshine days in December: 14.5 days
The month with the most sunshine days is September (17.9 days).
The month with the least sunshine days is April (11.7 days).
Average UV index in December
Belfast, 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
Belfast, ME
- Average cloud cover in December: 52
The month with the most cloud cover is March (Cloud cover 55).
The months with the least cloud cover are August and September (Cloud cover 37).
Average visibility in December
Belfast, ME
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, October, November and December (6mi).
The months with the lowest visibility are May, June, July, August and September (5mi).
Belfast, Maine, USA
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