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 December's onset, the average high-temperature recedes from November's chilly 47.7°F (8.7°C) to an icy 37°F (2.8°C). Nighttime temperature in Granby experiences an average drop to a freezing cold 25.9°F (-3.4°C) in December.Humidity
The average relative humidity in December is 79%.Rainfall
In Granby, in December, during 7.8 rainfall days, 1.57" (40mm) of precipitation is typically accumulated. Throughout the year, there are 130.2 rainfall days, and 19.25" (489mm) of precipitation is accumulated.Snowfall
Months with snowfall in Granby are January through May, November and December. In Granby, in December, during 4.1 snowfall days, 1.73" (44mm) of snow is typically accumulated. In Granby, during the entire year, snow falls for 24.5 days and aggregates up to 7.68" (195mm) of snow.Daylight
December has the shortest days of the year in Granby, Connecticut, with an average of 9h and 12min of daylight.On the first day of December in Granby, Connecticut, sunrise is at 7:00 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:30 pm EST.
Sunshine
The average sunshine in December is 4.9h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Granby. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for average individuals.Note: The average daily UV index of 2 in December transforms into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Granby?
What is the average humidity in December in Granby?
How much does it rain in Granby in December?
How many days does it snow in December in Granby?
What is the month with the shortest days in Granby?
How many hours of daylight does Granby have in December?
When are sunrise and sunset in December in Granby?
How many hours of sunshine does Granby have in December?
What are the months with the lowest UV index in Granby?
What is the UV index reading in December in Granby?
Average temperature in December
Granby, CT
- Average high temperature in December: 37°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in December: 25.9°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
Granby, CT
- Average pressure in December: 30.05"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Granby, CT
- Average wind speed in December: 7.4mph
The windiest month (with the highest average wind speed) is March (7.9mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in December
Granby, CT
- Average humidity in December: 79%
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is April (71%).
Average rainfall in December
Granby, CT
- Average rainfall in December: 1.57"
The wettest month (with the highest rainfall) is July (2.01").
The driest month (with the least rainfall) is January (1.14").
Average rainfall days in December
Granby, CT
- Average rainfall days in December: 7.8 days
The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is January (6.3 days).
Average snowfall in December
Granby, CT
- Average snowfall in December: 1.73"
The month with the highest snowfall is February (2.48").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Granby, CT
- Average snowfall days in December: 4.1 days
The month with the highest number of snowfall days is February (7 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Granby, 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 5min
The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in December
Granby, CT
- Average sunshine days in December: 19 days
The month with the most sunshine days is January (19.9 days).
The month with the least sunshine days is July (14.1 days).
Average UV index in December
Granby, CT
- Average UV index in December: 2
The months with the highest UV index are June, July and August (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
Granby, CT
- Average cloud cover in December: 46
The months with the most cloud cover are February and March (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in December
Granby, CT
- Average visibility in December: 6mi
The months with the highest visibility are January, March, April, October, November and December (6mi).
The months with the lowest visibility are February, May, June, July, August and September (5mi).
Granby, Connecticut, USA
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