December weather forecastSimsbury, CT
December
Weather in December
With December, winter is in full swing in Simsbury, Connecticut, as the overall temperature slides further down to an average high of 37.6°F (3.1°C). The quiet fall of snow showers, coupled with decorated streets and houses, ushers in the festive spirit. December watches the precipitation shift from rain to snow, with an average snowfall of 3.54" (90mm), redefining the cityscape. The weather paints a perfect backdrop for holiday celebrations and snow-related activities. Simsbury shimmers under a pristine white velvet, wrapping the year on a magical note.Temperature
In December, the meteorological conditions alter, with the average high-temperature shifting from a frosty 48.2°F (9°C) in November to a wintry 37.6°F (3.1°C). During December, the average low-temperature is recorded at a freezing cold 26.8°F (-2.9°C).Humidity
The average relative humidity in December in Simsbury 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
January through May, October through December are months with snowfall. In December, it is snowing for 6.1 days. Throughout December, 3.54" (90mm) of snow is accumulated. In Simsbury, during the entire year, snow falls for 33.1 days and aggregates up to 18.39" (467mm) of snow.Daylight
The month with the shortest days in Simsbury is December, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 6:59 am and sunset at 4:21 pm. On the last day of December, in Simsbury, sunrise is at 7:18 am and sunset at 4:30 pm EST.
Sunshine
The average sunshine in December in Simsbury 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 in Simsbury. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for the average person.Note: The UV index of 2 in December translates into these instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Simsbury, 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
Simsbury, 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
Simsbury, 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
Simsbury, 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
Simsbury, 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
Simsbury, 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
Simsbury, 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
Simsbury, 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
Simsbury, CT
- Average daylight in December: 9h and 12min
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 42min
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
Simsbury, 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
Simsbury, 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
Simsbury, 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
Simsbury, 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).
