December weather forecastMount Union, PA
December
Weather in December
The first month of the winter, December, is still a cold month in Mount Union, Pennsylvania, with an average temperature varying between 27.5°F (-2.5°C) and 38.8°F (3.8°C).Temperature
With December's onset, the average high-temperature recedes from November's frosty 48.4°F (9.1°C) to a cold 38.8°F (3.8°C). In Mount Union, December nights cool down to an average of 27.5°F (-2.5°C).Humidity
The average relative humidity in December is 81%.Rainfall
In Mount Union, in December, it is raining for 10.9 days, with typically 2.36" (60mm) of accumulated precipitation. Throughout the year, there are 164.3 rainfall days, and 28.19" (716mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. In Mount Union, in December, during 7.7 snowfall days, 2.56" (65mm) of snow is typically accumulated. Throughout the year, there are 40.6 snowfall days, and 17.91" (455mm) of snow is accumulated.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:15 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 4:55 pm EST.
Sunshine
In Mount Union, the average sunshine in December is 4.3h.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 hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mount Union, PA
- Average high temperature in December: 38.8°F
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (32.9°F).
- Average low temperature in December: 27.5°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).
Average pressure in December
Mount Union, 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
Mount Union, PA
- Average wind speed in December: 7.1mph
The windiest month (with the highest average wind speed) is January (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity in December
Mount Union, PA
- Average humidity in December: 81%
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is July (75%).
Average rainfall in December
Mount Union, PA
- Average rainfall in December: 2.36"
The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is September (1.85").
Average rainfall days in December
Mount Union, PA
- Average rainfall days in December: 10.9 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (9.5 days).
Average snowfall in December
Mount Union, PA
- Average snowfall in December: 2.56"
The month with the highest snowfall is January (5.24").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Mount Union, PA
- Average snowfall days in December: 7.7 days
The month with the highest number of snowfall days is January (12.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Mount Union, PA
- Average daylight in December: 9h and 18min
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 18min).
- Average sunshine in December: 4h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in December
Mount Union, PA
- Average sunshine days in December: 14.2 days
The month with the most sunshine days is November (16.7 days).
The month with the least sunshine days is May (10.7 days).
Average UV index in December
Mount Union, PA
- Average UV index in December: 2
The months with the highest UV index are May and June (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
Mount Union, PA
- Average cloud cover in December: 55
The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are July and August (Cloud cover 34).
Average visibility in December
Mount Union, PA
- Average visibility in December: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
