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
Slippery Rock, Pennsylvania, in December experiences a subtle temperature decline, with average high-temperatures reducing from a chilly 47.1°F (8.4°C) in November to a cold 37.2°F (2.9°C). The temperature in Slippery Rock lowers to an average of 26.2°F (-3.2°C) during December nights.Humidity
In Slippery Rock, the average relative humidity in December is 86%.Rainfall
In Slippery Rock, in December, during 10.7 rainfall days, 2.83" (72mm) of precipitation is typically accumulated. Throughout the year, there are 177.8 rainfall days, and 36.65" (931mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Slippery Rock, during December, snow falls for 15.6 days and regularly aggregates up to 5.83" (148mm) of snow. In Slippery Rock, during the entire year, snow falls for 75.3 days and aggregates up to 32.05" (814mm) of snow.Daylight
December has the shortest days of the year in Slippery Rock, with an average of 9h and 18min of daylight.On the first day of December in Slippery Rock, sunrise is at 7:26 am and sunset at 4:52 pm. On the last day of the month, sunrise is at 7:45 am and sunset at 5:01 pm EST.
Sunshine
In Slippery Rock, the average sunshine in December is 2.7h.UV index
The month with the lowest UV index in Slippery Rock is December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: A typical high UV index of 1 in December suggests the following recommendations:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
How cold is it in Slippery Rock in December?
What is the average humidity in December in Slippery Rock?
How many days does it rain in December in Slippery Rock?
How much does it snow in Slippery Rock in December?
What is the month with the shortest days in Slippery Rock?
What is the average length of the day in December in Slippery Rock?
What time are sunrise and sunset in December in Slippery Rock?
How long on average sun shines in December in Slippery Rock?
What is the month with the lowest UV index in Slippery Rock?
How high is the UV index in December in Slippery Rock?
Average temperature in December
Slippery Rock, PA
- Average high temperature in December: 37.2°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.3°F).
- Average low temperature in December: 26.2°F
The month with the highest average low temperature is July (60.1°F).
The coldest month (with the lowest average low temperature) is January (18.1°F).
Average pressure in December
Slippery Rock, PA
- Average pressure in December: 30.1"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
Slippery Rock, PA
- Average wind speed in December: 7.6mph
The windiest month (with the highest average wind speed) is January (8.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.2mph).
Average humidity in December
Slippery Rock, PA
- Average humidity in December: 86%
The month with the highest relative humidity is February (88%).
The months with the lowest relative humidity are April, May, June, July and August (79%).
Average rainfall in December
Slippery Rock, PA
- Average rainfall in December: 2.83"
The wettest month (with the highest rainfall) is April (3.74").
The driest month (with the least rainfall) is November (2.36").
Average rainfall days in December
Slippery Rock, PA
- Average rainfall days in December: 10.7 days
The month with the highest number of rainy days is May (19.8 days).
The month with the least rainy days is January (8.1 days).
Average snowfall in December
Slippery Rock, PA
- Average snowfall in December: 5.83"
The month with the highest snowfall is January (8.54").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Slippery Rock, PA
- Average snowfall days in December: 15.6 days
The month with the highest number of snowfall days is January (19.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Slippery Rock, PA
- Average daylight in December: 9h and 2min
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 18min).
- Average sunshine in December: 2h and 4min
The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).
Average sunshine days in December
Slippery Rock, PA
- Average sunshine days in December: 9.3 days
The month with the most sunshine days is November (13.1 days).
The month with the least sunshine days is February (6.3 days).
Average UV index in December
Slippery Rock, PA
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Slippery Rock, PA
- Average cloud cover in December: 72
The month with the most cloud cover is January (Cloud cover 76).
The month with the least cloud cover is August (Cloud cover 38).
Average visibility in December
Slippery Rock, PA
- Average visibility in December: 4mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (5mi).
The months with the lowest visibility are January, February and December (4mi).
Slippery Rock, Pennsylvania, USA
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