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
Start of December brings a shift in the average high-temperature, falling from November's fresh 52.9°F (11.6°C) to a chilly 43.7°F (6.5°C). Jarrettsville experiences an average low-temperature of 32.2°F (0.1°C) in the month of December.Humidity
In December, the average relative humidity is 78%.Rainfall
In Jarrettsville, in December, during 9.8 rainfall days, 2.76" (70mm) of precipitation is typically accumulated. In Jarrettsville, during the entire year, the rain falls for 155.7 days and collects up to 32.64" (829mm) of precipitation.Snowfall
Months with snowfall are January through May, November and December. In Jarrettsville, in December, snow falls for 3.4 days, with typically accumulated 1.38" (35mm) of snow. In Jarrettsville, during the entire year, snow falls for 19.9 days and aggregates up to 9.72" (247mm) of snow.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year in Jarrettsville.On the first day of the month, sunrise is at 7:08 am and sunset at 4:42 pm. On the last day of December, in Jarrettsville, sunrise is at 7:26 am and sunset at 4:52 pm EST.
Sunshine
In December, the average sunshine is 5h.UV index
The months with the lowest UV index in Jarrettsville are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index of 2 during December translates into these guidelines:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Frequently asked questions
Is December cold in Jarrettsville?
What is the average humidity in December in Jarrettsville?
How much does it rain in Jarrettsville in December?
How much does it snow in Jarrettsville in December?
What is the month with the shortest days in Jarrettsville?
What is the average length of the day in December in Jarrettsville?
When is the sunrise / sunset in December in Jarrettsville?
How many hours of sunshine does Jarrettsville have in December?
When is the lowest UV index in Jarrettsville?
How high is the UV index in December in Jarrettsville?
Average temperature in December
Jarrettsville, MD
- Average high temperature in December: 43.7°F
The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (37.6°F).
- Average low temperature in December: 32.2°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (25.3°F).
Average pressure in December
Jarrettsville, MD
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Jarrettsville, MD
- Average wind speed in December: 8.3mph
The windiest month (with the highest average wind speed) is March (9.1mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).
Average humidity in December
Jarrettsville, MD
- Average humidity in December: 78%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is April (74%).
Average rainfall in December
Jarrettsville, MD
- Average rainfall in December: 2.76"
The wettest month (with the highest rainfall) is August (4.09").
The driest month (with the least rainfall) is February (2.09").
Average rainfall days in December
Jarrettsville, MD
- Average rainfall days in December: 9.8 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in December
Jarrettsville, MD
- Average snowfall in December: 1.38"
The month with the highest snowfall is March (2.87").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Jarrettsville, MD
- Average snowfall days in December: 3.4 days
The months with the highest number of snowfall days are January and February (5.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Jarrettsville, 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 0min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in December
Jarrettsville, MD
- Average sunshine days in December: 17.8 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is May (11.7 days).
Average UV index in December
Jarrettsville, 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
Jarrettsville, MD
- Average cloud cover in December: 46
The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
Jarrettsville, 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).
Jarrettsville, Maryland, USA
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