December weather forecastCastle Heights, VA
December
Weather in December
December, the first month of the winter in Castle Heights, is still a cool month, with temperature in the range of an average low of 36.5°F (2.5°C) and an average high of 50.9°F (10.5°C).Temperature
The onset of December results in a small decrease in the average high-temperature, moderately receding from a moderate 57.9°F (14.4°C) in November to a fresh 50.9°F (10.5°C). An average nighttime temperature of 36.5°F (2.5°C) is recorded during December.Humidity
With an average relative humidity of 78%, December is the most humid month.Rainfall
In Castle Heights, in December, during 10.3 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. Throughout the year, there are 144.4 rainfall days, and 21.3" (541mm) of precipitation is accumulated.Snowfall
January through March and December are months with snowfall. December is the first month it typically snows in Castle Heights, Virginia. Throughout December, in the average 0.8 snowfall days, it receives 0.71" (18mm) of snow. Throughout the year, in Castle Heights, there are 6.3 snowfall days, and 3.74" (95mm) of snow is accumulated.Daylight
The month with the shortest days in Castle Heights is December, with an average of 9h and 42min of daylight.On the first day of December, sunrise is at 7:07 am and sunset at 4:57 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 5:07 pm EST.
Sunshine
The months with the least sunshine in Castle Heights are January and December, with an average of 5.5h of sunshine.UV index
January and December, with an average maximum UV index of 2, are months with the lowest UV index in Castle Heights. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the average person.Note: The maximum UV index, 2 during December, leads to the following recommendations:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Castle Heights, VA
- Average high temperature in December: 50.9°F
The warmest month (with the highest average high temperature) is July (90°F).
The month with the lowest average high temperature is January (46°F).
- Average low temperature in December: 36.5°F
The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).
Average pressure in December
Castle Heights, VA
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in December
Castle Heights, VA
- Average wind speed in December: 6.3mph
The windiest month (with the highest average wind speed) is April (7.7mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in December
Castle Heights, VA
- Average humidity in December: 78%
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (71%).
Average rainfall in December
Castle Heights, VA
- Average rainfall in December: 1.73"
The wettest month (with the highest rainfall) is May (2.13").
The driest month (with the least rainfall) is September (1.3").
Average rainfall days in December
Castle Heights, VA
- Average rainfall days in December: 10.3 days
The month with the highest number of rainy days is July (16.7 days).
The month with the least rainy days is October (8.3 days).
Average snowfall in December
Castle Heights, VA
- Average snowfall in December: 0.71"
The month with the highest snowfall is January (1.5").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in December
Castle Heights, VA
- Average snowfall days in December: 0.8 days
The month with the highest number of snowfall days is February (2.5 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Castle Heights, VA
- Average daylight in December: 9h and 42min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in December: 5h and 30min
The months with the most sunshine are June and July (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 30min).
Average sunshine days in December
Castle Heights, VA
- Average sunshine days in December: 19.6 days
The month with the most sunshine days is October (21.4 days).
The month with the least sunshine days is July (12 days).
Average UV index in December
Castle Heights, VA
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in December
Castle Heights, VA
- Average cloud cover in December: 42
The months with the most cloud cover are February and March (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
Castle Heights, VA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
