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
December weather is marked by a drop in the average high-temperature, falling from a cool 54.5°F (12.5°C) in November to a chilly 45.5°F (7.5°C). The nighttime temperature in Jefferson dips to a wintry 33.1°F (0.6°C) on average during December.Humidity
In December, the average relative humidity is 76%.Rainfall
In Jefferson, Maryland, in December, it is raining for 10.8 days, with typically 2.68" (68mm) of accumulated precipitation. Throughout the year, there are 161.2 rainfall days, and 31.54" (801mm) of precipitation is accumulated.Snowfall
Months with snowfall in Jefferson are January through April, November and December. In Jefferson, in December, during 2.6 snowfall days, 1.73" (44mm) of snow is typically accumulated. In Jefferson, Maryland, during the entire year, snow falls for 16.1 days and aggregates up to 10.39" (264mm) of snow.Daylight
December has the shortest days of the year in Jefferson, Maryland, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:11 am and sunset at 4:47 pm. On the last day of December, sunrise is at 7:29 am and sunset at 4:56 pm EST.
Sunshine
The months with the least sunshine are January, February and December, with an average of 5.2h of sunshine.UV index
The months with the lowest UV index in Jefferson are January, 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 radiation for the ordinary person.Note: A daily maximum UV index of 2 in December translates into the following instructions:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Frequently asked questions
What is the usual temperature for Jefferson in December?
What is the average humidity in December in Jefferson?
How much does it rain in Jefferson in December?
How much does it snow in Jefferson in December?
What is the month with the shortest days in Jefferson?
How many hours of daylight does Jefferson have in December?
When is the sunrise / sunset in December in Jefferson?
What are the months with the least sunshine in Jefferson?
How long on average sun shines in December in Jefferson?
What are the months with the lowest UV index in Jefferson?
What is the UV index intensity in December in Jefferson?
Average temperature in December
Jefferson, MD
- Average high temperature in December: 45.5°F
The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is January (40.5°F).
- Average low temperature in December: 33.1°F
The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (27.1°F).
Average pressure in December
Jefferson, 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
Jefferson, MD
- Average wind speed in December: 6.6mph
The windiest month (with the highest average wind speed) is March (7.6mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Jefferson, MD
- Average humidity in December: 76%
The month with the highest relative humidity is October (77%).
The months with the lowest relative humidity are April and July (71%).
Average rainfall in December
Jefferson, MD
- Average rainfall in December: 2.68"
The wettest month (with the highest rainfall) is August (3.78").
The driest month (with the least rainfall) is January (2.05").
Average rainfall days in December
Jefferson, MD
- Average rainfall days in December: 10.8 days
The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is November (8.9 days).
Average snowfall in December
Jefferson, MD
- Average snowfall in December: 1.73"
The month with the highest snowfall is January (3.31").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Jefferson, MD
- Average snowfall days in December: 2.6 days
The month with the highest number of snowfall days is January (4.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Jefferson, MD
- Average daylight in December: 9h and 2min
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 24min).
- Average sunshine in December: 5h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 12min).
Average sunshine days in December
Jefferson, MD
- Average sunshine days in December: 17.4 days
The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is July (10.9 days).
Average UV index in December
Jefferson, 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, November and December (UV index 2).
Average cloud cover in December
Jefferson, MD
- Average cloud cover in December: 44
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in December
Jefferson, 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).
Jefferson, Maryland, USA
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