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
Mill Run in December undergoes a mild reduction in the average high-temperature, shifting from November's frosty 49.3°F (9.6°C) to a wintry 39.7°F (4.3°C). Mill Run records an average nighttime low-temperature of 27.9°F (-2.3°C) throughout December.Humidity
In Mill Run, the average relative humidity in December is 84%.Rainfall
In Mill Run, in December, during 9.4 rainfall days, 1.42" (36mm) of precipitation is typically accumulated. In Mill Run, during the entire year, the rain falls for 150.7 days and collects up to 16.65" (423mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In December, it is snowing for 11.5 days. Throughout December, 3.74" (95mm) of snow is accumulated. In Mill Run, during the entire year, snow falls for 58.2 days and aggregates up to 17.44" (443mm) of snow.Daylight
The month with the shortest days in Mill Run is December, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:20 am and sunset at 4:53 pm. On the last day of December, sunrise is at 7:39 am and sunset at 5:02 pm EST.
Sunshine
In Mill Run, the average sunshine in December is 3.5h.UV index
The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.Note: A maximum daily UV index of 2 during December morphs into the following directions:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Always opt for UVA and UVB-resistant sunglasses on radiant days. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is December cold?
What is the average humidity in December?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December in Mill Run?
When are sunrise and sunset in December?
How long on average sun shines in December?
What are the months with the lowest UV index?
How high is the UV index in December?
Average temperature in December
Mill Run, PA
- Average high temperature in December: 39.7°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (34°F).
- Average low temperature in December: 27.9°F
The month with the highest average low temperature is July (59.9°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).
Average pressure in December
Mill Run, PA
- 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
Mill Run, PA
- Average wind speed in December: 7.7mph
The windiest month (with the highest average wind speed) is January (8.4mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Mill Run, PA
- Average humidity in December: 84%
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are July and August (77%).
Average rainfall in December
Mill Run, PA
- Average rainfall in December: 1.42"
The wettest month (with the highest rainfall) is May (1.97").
The driest months (with the least rainfall) are September and November (0.91").
Average rainfall days in December
Mill Run, PA
- Average rainfall days in December: 9.4 days
The month with the highest number of rainy days is May (18.1 days).
The month with the least rainy days is February (7.9 days).
Average snowfall in December
Mill Run, PA
- Average snowfall in December: 3.74"
The month with the highest snowfall is January (4.29").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Mill Run, PA
- Average snowfall days in December: 11.5 days
The month with the highest number of snowfall days is January (15.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Mill Run, PA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 3h and 3min
The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).
Average sunshine days in December
Mill Run, PA
- Average sunshine days in December: 12.1 days
The month with the most sunshine days is November (16.6 days).
The month with the least sunshine days is January (8.6 days).
Average UV index in December
Mill Run, PA
- Average UV index in December: 2
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in December
Mill Run, PA
- Average cloud cover in December: 65
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 37).
Average visibility in December
Mill Run, PA
- Average visibility in December: 5mi
The month with the highest visibility is April (6mi).
The month with the lowest visibility is January (4mi).
Mill Run, Pennsylvania, USA
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