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
The commencement of December includes a gentle temperature shift, with the average high-temperature dropping a bit from a cool 53.6°F (12°C) in November to a chilly 45.5°F (7.5°C). December nights are marked by an average temperature drop to a cold 34.5°F (1.4°C).Humidity
In Harpers Mill, the average relative humidity in December is 76%.Rainfall
In December, in Harpers Mill, the rain falls for 10.4 days. Throughout December, 2.32" (59mm) of precipitation is accumulated. Throughout the year, in Harpers Mill, Maryland, there are 157.2 rainfall days, and 30.47" (774mm) of precipitation is accumulated.Snowfall
January through March, November and December are months with snowfall. In December, it is snowing for 2.1 days. Throughout December, 0.39" (10mm) of snow is accumulated. In Harpers Mill, during the entire year, snow falls for 11.9 days and aggregates up to 5.75" (146mm) 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 7:07 am and sunset at 4:44 pm. On the last day of December, in Harpers Mill, sunrise is at 7:25 am and sunset at 4:54 pm EST.
Sunshine
In Harpers Mill, Maryland, the average sunshine in December is 5.2h.UV index
The months with the lowest UV index in Harpers Mill are January, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: In December, an average UV index of 2 transforms into the following instructions:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Frequently asked questions
What are December temperatures in Harpers Mill?
What is the average humidity in December in Harpers Mill?
How many days does it rain in December in Harpers Mill?
How many days does it snow in December in Harpers Mill?
What is the month with the shortest days in Harpers Mill?
What is the average length of the day in December in Harpers Mill?
When are sunrise and sunset in December in Harpers Mill?
How long on average sun shines in December in Harpers Mill?
What is the month with the lowest UV index in Harpers Mill?
How high is the UV index in December in Harpers Mill?
Average temperature in December
Harpers Mill, MD
- Average high temperature in December: 45.5°F
The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is January (38.8°F).
- Average low temperature in December: 34.5°F
The month with the highest average low temperature is July (70.3°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).
Average pressure in December
Harpers Mill, 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
Harpers Mill, MD
- Average wind speed in December: 8.5mph
The windiest months (with the highest average wind speed) are January, February and March (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in December
Harpers Mill, MD
- Average humidity in December: 76%
The month with the highest relative humidity is May (77%).
The months with the lowest relative humidity are March, April and July (72%).
Average rainfall in December
Harpers Mill, MD
- Average rainfall in December: 2.32"
The wettest month (with the highest rainfall) is August (4.09").
The driest month (with the least rainfall) is January (1.81").
Average rainfall days in December
Harpers Mill, MD
- Average rainfall days in December: 10.4 days
The month with the highest number of rainy days is May (18 days).
The months with the least rainy days are January and November (8.4 days).
Average snowfall in December
Harpers Mill, MD
- Average snowfall in December: 0.39"
The month with the highest snowfall is January (2.09").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Harpers Mill, MD
- Average snowfall days in December: 2.1 days
The month with the highest number of snowfall days is January (3.8 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
Harpers Mill, 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
Harpers Mill, MD
- Average sunshine days in December: 18.4 days
The month with the most sunshine days is November (19.9 days).
The months with the least sunshine days are May and July (10.8 days).
Average UV index in December
Harpers Mill, 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
Harpers Mill, 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
Harpers Mill, 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).
Harpers Mill, Maryland, USA
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