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
Onset of December witnesses a reduction in the average high-temperature, falling from a frosty 49.3°F in November to an icy 39.7°F. In December, Mill Run encounters an average low-temperature of 27.9°F during the night.Humidity
The average relative humidity in December is 84%.Rainfall
In December, the rain falls for 9.4 days. Throughout December, 1.42" of precipitation is accumulated. In Mill Run, Pennsylvania, during the entire year, the rain falls for 150.7 days and collects up to 16.65" of precipitation.Snowfall
Months with snowfall in Mill Run, Pennsylvania, are January through May, October through December. In Mill Run, in December, snow falls for 11.5 days, with typically accumulated 3.74" of snow. Throughout the year, there are 58.2 snowfall days, and 17.44" of snow is accumulated.Daylight
The month with the shortest days 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, Pennsylvania, the average sunshine in December is 3.5h.UV index
January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Mill Run, Pennsylvania. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.Note: In December, a regular UV index of 2 translates into these guidelines:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. To cut down UV radiation exposure by about half, sport a wide-brim hat. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
FAQ
How cold is December in Mill Run?
What is the average humidity in December in Mill Run?
How much does it rain in Mill Run in December?
How many days does it snow in December in Mill Run?
What is the month with the shortest days in Mill Run?
What is the average length of the day in December in Mill Run?
When are sunrise and sunset in December in Mill Run?
How long on average sun shines in December in Mill Run?
What are the months with the lowest UV index in Mill Run?
How high is the UV index in December in Mill Run?
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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