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's onset brings a negligible change in high-temperatures, falling from a cool 54.7°F (12.6°C) in November to a frosty 46.4°F (8°C). Mount Harmony Hills, in December, observes a steady average low-temperature of 36.5°F (2.5°C).Humidity
In December, the average relative humidity is 75%.Rainfall
In December, in Mount Harmony Hills, the rain falls for 8.4 days. Throughout December, 0.91" (23mm) of precipitation is accumulated. Throughout the year, there are 132.3 rainfall days, and 15.83" (402mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through March, November and December. In Mount Harmony Hills, during December, snow falls for 1.6 days and regularly aggregates up to 0.28" (7mm) of snow. In Mount Harmony Hills, during the entire year, snow falls for 9.4 days and aggregates up to 1.97" (50mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 30min of daylight.On the first day of December, sunrise is at 7:06 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:55 pm EST.
Sunshine
In December, the average sunshine is 5.2h.UV index
January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for average individuals.Note: A daily high UV index of 2 in December leads to these guidelines:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average December temperature?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days in Mount Harmony Hills?
How many hours of daylight does Mount Harmony Hills have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Mount Harmony Hills have in December?
When is the lowest UV index?
How high is the UV index in December?
Average temperature in December
Mount Harmony Hills, MD
- Average high temperature in December: 46.4°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (40.6°F).
- Average low temperature in December: 36.5°F
The month with the highest average low temperature is July (71.6°F).
The coldest month (with the lowest average low temperature) is January (30.2°F).
Average pressure in December
Mount Harmony Hills, 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
Mount Harmony Hills, MD
- Average wind speed in December: 9.2mph
The windiest months (with the highest average wind speed) are January and March (9.9mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).
Average humidity in December
Mount Harmony Hills, MD
- Average humidity in December: 75%
The month with the highest relative humidity is May (79%).
The months with the lowest relative humidity are January and November (72%).
Average rainfall in December
Mount Harmony Hills, MD
- Average rainfall in December: 0.91"
The wettest month (with the highest rainfall) is August (2.4").
The driest month (with the least rainfall) is January (0.67").
Average rainfall days in December
Mount Harmony Hills, MD
- Average rainfall days in December: 8.4 days
The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is November (6.6 days).
Average snowfall in December
Mount Harmony Hills, MD
- Average snowfall in December: 0.28"
The month with the highest snowfall is January (0.75").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Mount Harmony Hills, MD
- Average snowfall days in December: 1.6 days
The month with the highest number of snowfall days is January (2.9 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
Mount Harmony Hills, MD
- 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 54min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).
Average sunshine days in December
Mount Harmony Hills, MD
- Average sunshine days in December: 19.9 days
The month with the most sunshine days is November (21.7 days).
The month with the least sunshine days is August (13.7 days).
Average UV index in December
Mount Harmony Hills, 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 and December (UV index 2).
Average cloud cover in December
Mount Harmony Hills, MD
- Average cloud cover in December: 43
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in December
Mount Harmony Hills, 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).
Mount Harmony Hills, Maryland, USA
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