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
The transition into December involves a decrease in the average high-temperature, falling from a cold 42.6°F (5.9°C) in November to a subzero cold 31.3°F (-0.4°C). The temperature in Castleton lowers to an average of 21.4°F (-5.9°C) during December nights.Humidity
In Castleton, the average relative humidity in December is 83%.Rainfall
In Castleton, in December, it is raining for 6.8 days, with typically 0.83" (21mm) of accumulated precipitation. In Castleton, during the entire year, the rain falls for 112.5 days and collects up to 10.75" (273mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Castleton. In Castleton, during December, snow falls for 8.1 days and regularly aggregates up to 1.85" (47mm) of snow. Throughout the year, there are 44.2 snowfall days, and 11.42" (290mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 0min of daylight.On the first day of December, sunrise is at 7:06 am and sunset at 4:17 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:26 pm EST.
Sunshine
The average sunshine in December is 3.9h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 1 in December converts into the following recommendations:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Enhance your sun protection with tightly woven, yet airy clothing. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Frequently asked questions
How cold is it in Castleton in December?
What is the average humidity in December in Castleton?
How many days does it rain in December in Castleton?
How many days does it snow in December in Castleton?
What is the month with the shortest days in Castleton?
What is the average length of the day in December in Castleton?
What time are sunrise and sunset in December in Castleton?
How long on average sun shines in December in Castleton?
What are the months with the lowest UV index in Castleton?
What is the UV index intensity in December in Castleton?
Average temperature in December
Castleton, VT
- Average high temperature in December: 31.3°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (25.2°F).
- Average low temperature in December: 21.4°F
The month with the highest average low temperature is July (56.8°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).
Average pressure in December
Castleton, 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 (29.91"Hg).
Average wind speed in December
Castleton, VT
- Average wind speed in December: 6.5mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in December
Castleton, VT
- Average humidity in December: 83%
The months with the highest relative humidity are January and February (86%).
The months with the lowest relative humidity are April and May (75%).
Average rainfall in December
Castleton, VT
- Average rainfall in December: 0.83"
The wettest month (with the highest rainfall) is June (1.22").
The driest months (with the least rainfall) are March and September (0.67").
Average rainfall days in December
Castleton, VT
- Average rainfall days in December: 6.8 days
The month with the highest number of rainy days is May (12.8 days).
The month with the least rainy days is January (4.5 days).
Average snowfall in December
Castleton, VT
- Average snowfall in December: 1.85"
The month with the highest snowfall is February (3.11").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Castleton, VT
- Average snowfall days in December: 8.1 days
The month with the highest number of snowfall days is February (11.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Castleton, VT
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 3h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 3h and 18min).
Average sunshine days in December
Castleton, VT
- Average sunshine days in December: 18.4 days
The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is February (15.6 days).
Average UV index in December
Castleton, VT
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Castleton, VT
- Average cloud cover in December: 59
The month with the most cloud cover is February (Cloud cover 64).
The months with the least cloud cover are July and August (Cloud cover 36).
Average visibility in December
Castleton, VT
- Average visibility in December: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
Castleton, Vermont, USA
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