December weather forecastPoolesville, MD
December
Weather in December
The first month of the winter, December, is still a chilly month in Poolesville, Maryland, with an average temperature varying between 31.6°F (-0.2°C) and 44.2°F (6.8°C).Temperature
The arrival of December corresponds with a temperature reduction, down from November's fresh 53.2°F (11.8°C) to a chilly 44.2°F (6.8°C). The average low-temperature of 31.6°F (-0.2°C) is witnessed during December.Humidity
October and December, with an average relative humidity of 78%, are the most humid months.Rainfall
In Poolesville, in December, during 7.2 rainfall days, 0.67" (17mm) of precipitation is typically accumulated. Throughout the year, there are 115.4 rainfall days, and 10.59" (269mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In Poolesville, in December, during 2.1 snowfall days, 0.47" (12mm) of snow is typically accumulated. In Poolesville, during the entire year, snow falls for 12.7 days and aggregates up to 2.24" (57mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 7:10 am and sunset at 4:47 pm. On the last day of December, sunrise is at 7:28 am and sunset at 4:57 pm EST.
Sunshine
The average sunshine in December is 5.1h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Poolesville, MD
- Average high temperature in December: 44.2°F
The warmest month (with the highest average high temperature) is July (86.7°F).
The month with the lowest average high temperature is January (38.8°F).
- Average low temperature in December: 31.6°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).
Average pressure in December
Poolesville, MD
- 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
Poolesville, MD
- Average wind speed in December: 6.8mph
The windiest month (with the highest average wind speed) is March (7.6mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).
Average humidity in December
Poolesville, MD
- Average humidity in December: 78%
The months with the highest relative humidity are October and December (78%).
The month with the lowest relative humidity is July (72%).
Average rainfall in December
Poolesville, MD
- Average rainfall in December: 0.67"
The wettest month (with the highest rainfall) is August (1.5").
The driest month (with the least rainfall) is September (0.51").
Average rainfall days in December
Poolesville, MD
- Average rainfall days in December: 7.2 days
The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is January (6.1 days).
Average snowfall in December
Poolesville, MD
- Average snowfall in December: 0.47"
The month with the highest snowfall is January (0.75").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Poolesville, MD
- Average snowfall days in December: 2.1 days
The month with the highest number of snowfall days is February (4.1 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
Poolesville, MD
- Average daylight in December: 9h and 30min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 5h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The months with the least sunshine are January and February (Average sunshine: 5h and 0min).
Average sunshine days in December
Poolesville, MD
- Average sunshine days in December: 21.5 days
The month with the most sunshine days is January (21.9 days).
The month with the least sunshine days is May (14.6 days).
Average UV index in December
Poolesville, MD
- 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
Poolesville, MD
- Average cloud cover in December: 45
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in December
Poolesville, MD
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
