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 shows a mild decline in the average high-temperature, falling from November's chilly 46.6°F (8.1°C) to an icy 36.7°F (2.6°C). An average nighttime temperature of 25.7°F (-3.5°C) is recorded in Cornwall during December.Humidity
In December, the average relative humidity is 81%.Rainfall
In Cornwall, during December, the rain falls for 10.9 days and regularly aggregates up to 3.35" (85mm) of precipitation. In Cornwall, during the entire year, the rain falls for 160.5 days and collects up to 33.86" (860mm) of precipitation.Snowfall
Months with snowfall in Cornwall are January through May, October through December. In Cornwall, Connecticut, during December, snow falls for 7.1 days and regularly aggregates up to 3.7" (94mm) of snow. Throughout the year, there are 40.2 snowfall days, and 20.39" (518mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 12min of daylight.On the first day of December in Cornwall, sunrise is at 7:01 am and sunset at 4:23 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:32 pm EST.
Sunshine
The average sunshine in December in Cornwall is 4.5h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Cornwall. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum UV index of 2 in December translates into the following recommendations:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Frequently asked questions
How cold is it in Cornwall in December?
What is the average humidity in December in Cornwall?
How much does it rain in Cornwall in December?
How much does it snow in Cornwall in December?
What is the month with the shortest days in Cornwall?
How many hours of daylight does Cornwall have in December?
What time are sunrise and sunset in December in Cornwall?
How long on average sun shines in December in Cornwall?
When is the lowest UV index in Cornwall?
How high is the UV index in December in Cornwall?
Average temperature in December
Cornwall, CT
- Average high temperature in December: 36.7°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (30.9°F).
- Average low temperature in December: 25.7°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in December
Cornwall, CT
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Cornwall, CT
- Average wind speed in December: 7.5mph
The windiest months (with the highest average wind speed) are January and March (8mph).
The calmest months (with the lowest average wind speed) are July and August (5mph).
Average humidity in December
Cornwall, CT
- Average humidity in December: 81%
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (74%).
Average rainfall in December
Cornwall, CT
- Average rainfall in December: 3.35"
The wettest month (with the highest rainfall) is July (3.54").
The driest month (with the least rainfall) is January (2.17").
Average rainfall days in December
Cornwall, CT
- Average rainfall days in December: 10.9 days
The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is January (7.7 days).
Average snowfall in December
Cornwall, CT
- Average snowfall in December: 3.7"
The month with the highest snowfall is February (5.16").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Cornwall, CT
- Average snowfall days in December: 7.1 days
The month with the highest number of snowfall days is February (10.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Cornwall, CT
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days in December
Cornwall, CT
- Average sunshine days in December: 14.8 days
The month with the most sunshine days is January (16.8 days).
The month with the least sunshine days is June (10.8 days).
Average UV index in December
Cornwall, CT
- Average UV index in December: 2
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Cornwall, CT
- Average cloud cover in December: 52
The month with the most cloud cover is February (Cloud cover 53).
The months with the least cloud cover are July and August (Cloud cover 37).
Average visibility in December
Cornwall, CT
- Average visibility in December: 5mi
The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).
Cornwall, Connecticut, USA
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