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
The onset of December brings a small change in high-temperatures, falling from a chilly 48.2°F (9°C) in November to a wintry 38.3°F (3.5°C). In December, Slate Valley records an average nighttime temperature of 27.5°F (-2.5°C).Humidity
The average relative humidity in December is 82%.Rainfall
In December, the rain falls for 11.6 days. Throughout December, 2.48" (63mm) of precipitation is accumulated. In Slate Valley, during the entire year, the rain falls for 155.1 days and collects up to 29.45" (748mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Slate Valley, in December, during 4.6 snowfall days, 2.6" (66mm) of snow is typically accumulated. Throughout the year, there are 34 snowfall days, and 16.73" (425mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:07 am and sunset at 4:35 pm. On the last day of December, sunrise is at 7:26 am and sunset at 4:44 pm EST.
Sunshine
In December, the average sunshine is 4.5h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: In December, a daily maximum UV index of 1 leads to the following instructions:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. To guard against the harmful effects of the Sun, minimize exposure during midday. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it cold during December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Slate Valley have in December?
When are sunrise and sunset in December?
How many hours of sunshine does Slate Valley have in December?
When is the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Slate Valley, PA
- Average high temperature in December: 38.3°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in December: 27.5°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure in December
Slate Valley, 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 Valley, PA
- Average wind speed in December: 7.7mph
The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in December
Slate Valley, PA
- Average humidity in December: 82%
The month with the highest relative humidity is February (83%).
The months with the lowest relative humidity are April and July (77%).
Average rainfall in December
Slate Valley, PA
- Average rainfall in December: 2.48"
The wettest month (with the highest rainfall) is July (3.03").
The driest month (with the least rainfall) is September (1.77").
Average rainfall days in December
Slate Valley, PA
- Average rainfall days in December: 11.6 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (7.6 days).
Average snowfall in December
Slate Valley, PA
- Average snowfall in December: 2.6"
The months with the highest snowfall are January and March (4.41").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Slate Valley, PA
- Average snowfall days in December: 4.6 days
The month with the highest number of snowfall days is February (9.5 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 Valley, 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 18min).
- Average sunshine in December: 4h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).
Average sunshine days in December
Slate Valley, PA
- Average sunshine days in December: 16.9 days
The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is May (11.3 days).
Average UV index in December
Slate Valley, PA
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Slate Valley, PA
- Average cloud cover in December: 52
The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is July (Cloud cover 35).
Average visibility in December
Slate Valley, 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).
Slate Valley, Pennsylvania, USA
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