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 onset of December aligns with a soft reduction in the average high-temperature, gently falling from a cool 52.5°F (11.4°C) in November to a chilly 43.7°F (6.5°C). In Rileyville, an average temperature of 30°F (-1.1°C) is noted during December nights.Humidity
In Rileyville, Virginia, the average relative humidity in December is 78%.Rainfall
In Rileyville, in December, it is raining for 8.5 days, with typically 1.46" (37mm) of accumulated precipitation. Throughout the year, there are 146.8 rainfall days, and 21.02" (534mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Rileyville, during December, snow falls for 2.8 days and regularly aggregates up to 1.89" (48mm) of snow. In Rileyville, Virginia, during the entire year, snow falls for 17.4 days and aggregates up to 9.72" (247mm) of snow.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:13 am and sunset at 4:52 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 5:02 pm EST.
Sunshine
With an average of 5.1h of sunshine, December has the least sunshine of the year.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: In December, a daily maximum UV index of 2 leads to the following instructions:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it cold during December?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Rileyville have in December?
When is the sunrise / sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does Rileyville have in December?
What are the months with the lowest UV index in Rileyville?
What is the UV index intensity in December?
Average temperature in December
Rileyville, VA
- Average high temperature in December: 43.7°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (38.7°F).
- Average low temperature in December: 30°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (23.9°F).
Average pressure in December
Rileyville, VA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
Rileyville, VA
- Average wind speed in December: 5.8mph
The windiest months (with the highest average wind speed) are February and March (6.7mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).
Average humidity in December
Rileyville, VA
- Average humidity in December: 78%
The month with the highest relative humidity is October (79%).
The months with the lowest relative humidity are April and July (74%).
Average rainfall in December
Rileyville, VA
- Average rainfall in December: 1.46"
The wettest month (with the highest rainfall) is May (2.64").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days in December
Rileyville, VA
- Average rainfall days in December: 8.5 days
The month with the highest number of rainy days is August (17.8 days).
The month with the least rainy days is January (6.8 days).
Average snowfall in December
Rileyville, VA
- Average snowfall in December: 1.89"
The month with the highest snowfall is March (2.56").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Rileyville, VA
- Average snowfall days in December: 2.8 days
The month with the highest number of snowfall days is January (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
Rileyville, VA
- Average daylight in December: 9h and 3min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 5h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days in December
Rileyville, VA
- Average sunshine days in December: 20.1 days
The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is August (11.4 days).
Average UV index in December
Rileyville, 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, February, November and December (UV index 2).
Average cloud cover in December
Rileyville, VA
- Average cloud cover in December: 45
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
Rileyville, VA
- Average visibility in December: 5mi
The months with the highest visibility are January, February, April, June, July, August and November (6mi).
The months with the lowest visibility are March, May, September, October and December (5mi).
Rileyville, Virginia, USA
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