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
With December's onset, the weather reveals a slight temperature decrease, transitioning from a cool 53.4°F (11.9°C) in November to a chilly 45.5°F (7.5°C). During December, the average low-temperature is recorded at a wintry 34.2°F (1.2°C).Humidity
In December, the average relative humidity in Harmans is 76%.Rainfall
In Harmans, in December, during 10.1 rainfall days, 2.28" (58mm) of precipitation is typically accumulated. Throughout the year, there are 156.3 rainfall days, and 29.61" (752mm) of precipitation is accumulated.Snowfall
January through March, November and December are months with snowfall in Harmans. In Harmans, in December, during 2.2 snowfall days, 0.79" (20mm) of snow is typically accumulated. In Harmans, during the entire year, snow falls for 12.8 days and aggregates up to 6.77" (172mm) 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 in Harmans, sunrise is at 7:07 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:54 pm EST.
Sunshine
In December, the average sunshine in Harmans is 5.2h.UV index
The months with the lowest UV index in Harmans, Maryland, are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the average person.Note: In December, an average UV index of 2 transforms into the following instructions:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Frequently asked questions
What are December temperatures in Harmans?
What is the average humidity in December in Harmans?
How many days does it rain in December in Harmans?
How much does it snow in Harmans in December?
What is the month with the shortest days in Harmans?
What is the average length of the day in December in Harmans?
What time are sunrise and sunset in December in Harmans?
How long on average sun shines in December in Harmans?
When is the lowest UV index in Harmans?
How high is the UV index in December in Harmans?
Average temperature in December
Harmans, MD
- Average high temperature in December: 45.5°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 (38.8°F).
- Average low temperature in December: 34.2°F
The month with the highest average low temperature is July (70°F).
The coldest month (with the lowest average low temperature) is January (27.3°F).
Average pressure in December
Harmans, 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 (29.94"Hg).
Average wind speed in December
Harmans, MD
- Average wind speed in December: 8.3mph
The windiest months (with the highest average wind speed) are February and March (9mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).
Average humidity in December
Harmans, MD
- Average humidity in December: 76%
The month with the highest relative humidity is May (77%).
The months with the lowest relative humidity are April and July (72%).
Average rainfall in December
Harmans, MD
- Average rainfall in December: 2.28"
The wettest month (with the highest rainfall) is August (3.94").
The driest month (with the least rainfall) is January (1.77").
Average rainfall days in December
Harmans, MD
- Average rainfall days in December: 10.1 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is January (8.6 days).
Average snowfall in December
Harmans, MD
- Average snowfall in December: 0.79"
The month with the highest snowfall is January (2.24").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Harmans, MD
- Average snowfall days in December: 2.2 days
The month with the highest number of snowfall days is February (3.9 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
Harmans, MD
- Average daylight in December: 9h and 3min
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 1min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).
Average sunshine days in December
Harmans, MD
- Average sunshine days in December: 18.5 days
The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is July (10.9 days).
Average UV index in December
Harmans, 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
Harmans, MD
- Average cloud cover in December: 44
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility in December
Harmans, MD
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Harmans, Maryland, USA
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