December weather forecastSlate Run, PA
December
Weather in December
The first month of the winter, December, is also an icy month in Slate Run, Pennsylvania, with an average temperature varying between 35.2°F (1.8°C) and 25°F (-3.9°C).Temperature
The start of December comes with a reduction in the average high-temperature, receding from a frosty 44.6°F (7°C) in November to a wintry 35.2°F (1.8°C). Slate Run sees an average low-temperature of 25°F (-3.9°C) during December.Humidity
In December, the average relative humidity is 85%.Rainfall
In Slate Run, in December, it is raining for 11.3 days, with typically 2.8" (71mm) of accumulated precipitation. In Slate Run, during the entire year, the rain falls for 168.8 days and collects up to 32.56" (827mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Slate Run, in December, snow falls for 14.4 days, with typically accumulated 6.3" (160mm) of snow. Throughout the year, there are 71.6 snowfall days, and 35.47" (901mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:17 am and sunset at 4:41 pm. On the last day of December, sunrise is at 7:36 am and sunset at 4:50 pm EST.
Sunshine
The months with the least sunshine are January and December, with an average of 3h of sunshine.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: The daily high UV index of 1 during December translates into the following recommendations:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Slate Run, PA
- Average high temperature in December: 35.2°F
The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in December: 25°F
The month with the highest average low temperature is July (57.4°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).
Average pressure in December
Slate Run, PA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Slate Run, PA
- Average wind speed in December: 7.4mph
The windiest month (with the highest average wind speed) is January (8mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Slate Run, PA
- Average humidity in December: 85%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is July (77%).
Average rainfall in December
Slate Run, PA
- Average rainfall in December: 2.8"
The wettest month (with the highest rainfall) is April (3.7").
The driest month (with the least rainfall) is November (2.13").
Average rainfall days in December
Slate Run, PA
- Average rainfall days in December: 11.3 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is February (8.4 days).
Average snowfall in December
Slate Run, PA
- Average snowfall in December: 6.3"
The month with the highest snowfall is February (9.84").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Slate Run, PA
- Average snowfall days in December: 14.4 days
The month with the highest number of snowfall days is January (17.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Slate Run, PA
- Average daylight in December: 9h and 12min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 3h and 0min
The month with the most sunshine is July (Average sunshine: 9h and 30min).
The months with the least sunshine are January and December (Average sunshine: 3h and 0min).
Average sunshine days in December
Slate Run, PA
- Average sunshine days in December: 10 days
The month with the most sunshine days is September (14.5 days).
The month with the least sunshine days is February (7.9 days).
Average UV index in December
Slate Run, PA
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Slate Run, PA
- Average cloud cover in December: 69
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is July (Cloud cover 41).
Average visibility in December
Slate Run, PA
- Average visibility in December: 4mi
The months with the highest visibility are March, April, May, June, July and November (5mi).
The months with the lowest visibility are January, February, August, September, October and December (4mi).
