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 chilly 48.2°F (9°C) in November to a cold 37.6°F (3.1°C). December brings Collinsville a consistent average low-temperature of 26.8°F (-2.9°C).Humidity
In Collinsville, the average relative humidity in December is 79%.Rainfall
December is the month with the most rainfall. Rain falls for 10.5 days and accumulates 3.43" (87mm) of precipitation.Snowfall
Months with snowfall in Collinsville are January through May, October through December. In Collinsville, in December, during 6.1 snowfall days, 3.54" (90mm) of snow is typically accumulated. In Collinsville, during the entire year, snow falls for 33.1 days and aggregates up to 18.39" (467mm) of snow.Daylight
December has the shortest days of the year in Collinsville, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:00 am and sunset at 4:21 pm. On the last day of December, in Collinsville, Connecticut, sunrise is at 7:18 am and sunset at 4:31 pm EST.
Sunshine
The average sunshine in December in Collinsville, Connecticut, is 4.7h.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: An average maximum UV index of 2 in December leads to these recommendations:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is December cold in Collinsville?
What is the average humidity in December in Collinsville?
What is the wettest month in Collinsville?
How many days does it rain in December in Collinsville?
How many days does it snow in December in Collinsville?
What is the month with the shortest days in Collinsville?
What is the average length of the day in December in Collinsville?
When are sunrise and sunset in December in Collinsville?
How long on average sun shines in December in Collinsville?
What is the month with the lowest UV index in Collinsville?
What is the UV index reading in December in Collinsville?
Average temperature in December
Collinsville, CT
- Average high temperature in December: 37.6°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (32°F).
- Average low temperature in December: 26.8°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).
Average pressure in December
Collinsville, 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
Collinsville, CT
- Average wind speed in December: 7.8mph
The windiest months (with the highest average wind speed) are January and March (8.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.2mph).
Average humidity in December
Collinsville, CT
- Average humidity in December: 79%
The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is April (71%).
Average rainfall in December
Collinsville, CT
- Average rainfall in December: 3.43"
The wettest month (with the highest rainfall) is December (3.43").
The driest month (with the least rainfall) is September (1.97").
Average rainfall days in December
Collinsville, CT
- Average rainfall days in December: 10.5 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (9.4 days).
Average snowfall in December
Collinsville, CT
- Average snowfall in December: 3.54"
The month with the highest snowfall is February (5.24").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Collinsville, CT
- Average snowfall days in December: 6.1 days
The month with the highest number of snowfall days is February (8.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Collinsville, 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 4min
The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in December
Collinsville, CT
- Average sunshine days in December: 15.7 days
The month with the most sunshine days is January (17.1 days).
The month with the least sunshine days is June (11.6 days).
Average UV index in December
Collinsville, CT
- Average UV index in December: 2
The months with the highest UV index are June and July (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
Collinsville, CT
- Average cloud cover in December: 49
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in December
Collinsville, CT
- Average visibility in December: 6mi
The months with the highest visibility are April, October, November and December (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August and September (5mi).
Collinsville, Connecticut, USA
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