December weather forecastSouth Sterling, PA
December
Weather in December
December, the first month of the winter in South Sterling, is also a wintry month, with an average temperature fluctuating between 25.3°F (-3.7°C) and 36.1°F (2.3°C).Temperature
Arrival of December comes with a reduction in the average high-temperature, falling from a chilly 45.5°F (7.5°C) in November to a wintry 36.1°F (2.3°C). Throughout December, South Sterling records an average temperature of 25.3°F (-3.7°C) at night.Humidity
In South Sterling, the average relative humidity in December is 84%.Rainfall
In December, the rain falls for 10.8 days. Throughout December, 2.83" (72mm) of precipitation is accumulated. In South Sterling, during the entire year, the rain falls for 154.8 days and collects up to 32.24" (819mm) of precipitation.Snowfall
Months with snowfall in South Sterling are January through May, October through December. In South Sterling, in December, during 13.2 snowfall days, 7.13" (181mm) of snow is typically accumulated. In South Sterling, during the entire year, snow falls for 62.1 days and aggregates up to 38.86" (987mm) of snow.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year in South Sterling.On the first day of December, sunrise is at 7:08 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:42 pm EST.
Sunshine
In December, the average sunshine is 3.9h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 1 during December translates into the following directions:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Enhance your sun protection with tightly woven, yet airy clothing. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
South Sterling, PA
- Average high temperature in December: 36.1°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (29.8°F).
- Average low temperature in December: 25.3°F
The month with the highest average low temperature is July (59.5°F).
The coldest month (with the lowest average low temperature) is January (18°F).
Average pressure in December
South Sterling, PA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
South Sterling, PA
- Average wind speed in December: 8.1mph
The windiest months (with the highest average wind speed) are January and February (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).
Average humidity in December
South Sterling, PA
- Average humidity in December: 84%
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is July (77%).
Average rainfall in December
South Sterling, PA
- Average rainfall in December: 2.83"
The wettest month (with the highest rainfall) is July (3.27").
The driest month (with the least rainfall) is September (1.85").
Average rainfall days in December
South Sterling, PA
- Average rainfall days in December: 10.8 days
The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is January (7.1 days).
Average snowfall in December
South Sterling, PA
- Average snowfall in December: 7.13"
The month with the highest snowfall is February (8.03").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
South Sterling, PA
- Average snowfall days in December: 13.2 days
The month with the highest number of snowfall days is January (13.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
South Sterling, PA
- Average daylight in December: 9h and 18min
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: 3h and 54min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).
Average sunshine days in December
South Sterling, PA
- Average sunshine days in December: 12.2 days
The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is May (10.9 days).
Average UV index in December
South Sterling, 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
South Sterling, PA
- Average cloud cover in December: 60
The months with the most cloud cover are February and December (Cloud cover 60).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in December
South Sterling, PA
- Average visibility in December: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
