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
December's arrival correlates with a reduction in the average high-temperature, down from a wintry 36.5°F (2.5°C) in November to a freezing cold 23.9°F (-4.5°C). Grand Isle experiences a mean low-temperature of 12.2°F (-11°C) during December.Humidity
The average relative humidity in December in Grand Isle is 90%.Rainfall
In December, in Grand Isle, the rain falls for 7.8 days. Throughout December, 2.76" (70mm) of precipitation is accumulated. Throughout the year, in Grand Isle, Maine, there are 140.8 rainfall days, and 30.12" (765mm) of precipitation is accumulated.Snowfall
Months with snowfall in Grand Isle are January through May, October through December. In December, it is snowing for 17.8 days. Throughout December, 12.28" (312mm) of snow is accumulated. Throughout the year, there are 107.8 snowfall days, and 71.34" (1812mm) of snow is accumulated.Daylight
December has the shortest days of the year in Grand Isle, with an average of 8h and 30min of daylight.On the first day of the month, sunrise is at 6:59 am and sunset at 3:44 pm. On the last day of December, in Grand Isle, Maine, sunrise is at 7:19 am and sunset at 3:52 pm EST.
Sunshine
In December, the average sunshine in Grand Isle is 2.9h.UV index
January through March, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, the UV index of 1 transforms into the following advice:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Frequently asked questions
How cold is it in Grand Isle in December?
What is the average humidity in December in Grand Isle?
How much does it rain in Grand Isle in December?
How many days does it snow in December in Grand Isle?
What is the month with the shortest days in Grand Isle?
How many hours of daylight does Grand Isle have in December?
When is the sunrise / sunset in December in Grand Isle?
How long on average sun shines in December in Grand Isle?
When is the lowest UV index in Grand Isle?
What is the UV index intensity in December in Grand Isle?
Average temperature in December
Grand Isle, ME
- Average high temperature in December: 23.9°F
The warmest month (with the highest average high temperature) is July (74.3°F).
The month with the lowest average high temperature is January (18°F).
- Average low temperature in December: 12.2°F
The month with the highest average low temperature is July (53.6°F).
The coldest month (with the lowest average low temperature) is January (2.8°F).
Average pressure in December
Grand Isle, ME
- Average pressure in December: 30"Hg
The months with the highest atmospheric pressure are March, September and November (30.01"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
Grand Isle, ME
- Average wind speed in December: 7.7mph
The windiest months (with the highest average wind speed) are January and February (8.2mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in December
Grand Isle, ME
- Average humidity in December: 90%
The month with the highest relative humidity is March (94%).
The month with the lowest relative humidity is May (76%).
Average rainfall in December
Grand Isle, ME
- Average rainfall in December: 2.76"
The wettest month (with the highest rainfall) is April (2.95").
The driest month (with the least rainfall) is February (1.97").
Average rainfall days in December
Grand Isle, ME
- Average rainfall days in December: 7.8 days
The month with the highest number of rainy days is July (17.1 days).
The months with the least rainy days are January and February (4.3 days).
Average snowfall in December
Grand Isle, ME
- Average snowfall in December: 12.28"
The month with the highest snowfall is January (14.92").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Grand Isle, ME
- Average snowfall days in December: 17.8 days
The month with the highest number of snowfall days is January (21.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Grand Isle, ME
- Average daylight in December: 8h and 3min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in December: 2h and 5min
The month with the most sunshine is August (Average sunshine: 9h and 30min).
The month with the least sunshine is February (Average sunshine: 2h and 6min).
Average sunshine days in December
Grand Isle, ME
- Average sunshine days in December: 11.5 days
The month with the most sunshine days is September (14.5 days).
The month with the least sunshine days is April (7.9 days).
Average UV index in December
Grand Isle, ME
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in December
Grand Isle, ME
- Average cloud cover in December: 70
The month with the most cloud cover is February (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 42).
Average visibility in December
Grand Isle, ME
- Average visibility in December: 4mi
The months with the highest visibility are May, June, July, August, September, October and November (5mi).
The months with the lowest visibility are January, February, March, April and December (4mi).
Grand Isle, Maine, USA
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