December weather forecastGrafton, VT
December
Weather in December
December, the first month of the winter in Grafton, is also an icy month, with an average temperature fluctuating between 21.7°F (-5.7°C) and 32°F (0°C).Temperature
December brings a decrease in the average high-temperature, falling from November's 42.6°F (5.9°C) to a still cold 32°F (0°C). During December, Grafton's temperature averages to a freezing cold 21.7°F (-5.7°C) at night.Humidity
In December, the average relative humidity is 83%.Rainfall
In December, the rain falls for 12.5 days. Throughout December, 2.48" (63mm) of precipitation is accumulated. Throughout the year, there are 164.2 rainfall days, and 27.01" (686mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Grafton, in December, snow falls for 9.8 days, with typically accumulated 6.3" (160mm) of snow. In Grafton, during the entire year, snow falls for 58.9 days and aggregates up to 32.32" (821mm) of snow.Daylight
With an average of 9h and 6min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:03 am and sunset at 4:16 pm. On the last day of December, sunrise is at 7:22 am and sunset at 4:25 pm EST.
Sunshine
In December, the average sunshine is 4.6h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: A daily high UV index of 1 in December leads to these guidelines:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Grafton, VT
- Average high temperature in December: 32°F
The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in December: 21.7°F
The month with the highest average low temperature is July (57.2°F).
The coldest month (with the lowest average low temperature) is January (13.6°F).
Average pressure in December
Grafton, VT
- 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
Grafton, VT
- Average wind speed in December: 7.2mph
The windiest month (with the highest average wind speed) is January (7.7mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in December
Grafton, VT
- Average humidity in December: 83%
The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are April and May (75%).
Average rainfall in December
Grafton, VT
- Average rainfall in December: 2.48"
The wettest month (with the highest rainfall) is October (2.83").
The driest month (with the least rainfall) is September (1.85").
Average rainfall days in December
Grafton, VT
- Average rainfall days in December: 12.5 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is February (9.2 days).
Average snowfall in December
Grafton, VT
- Average snowfall in December: 6.3"
The month with the highest snowfall is February (9.29").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Grafton, VT
- Average snowfall days in December: 9.8 days
The month with the highest number of snowfall days is February (14.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Grafton, VT
- Average daylight in December: 9h and 6min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 4h and 36min
The months with the most sunshine are July and August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days in December
Grafton, VT
- Average sunshine days in December: 13.9 days
The month with the most sunshine days is September (15.3 days).
The month with the least sunshine days is February (10 days).
Average UV index in December
Grafton, VT
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Grafton, VT
- Average cloud cover in December: 52
The month with the most cloud cover is February (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in December
Grafton, VT
- Average visibility in December: 5mi
The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (5mi).
The month with the lowest visibility is February (4mi).
