December weather forecastGreenback, PA
December
Weather in December
The first month of the winter, December, is also an icy month in Greenback, Pennsylvania, with an average temperature fluctuating between 38.8°F (3.8°C) and 28°F (-2.2°C).Temperature
The decrease of average high-temperatures is mild in December, with a decline from a chilly 47.8°F (8.8°C) in November to an icy 38.8°F (3.8°C). Throughout December, Greenback registers a consistent average low-temperature of 28°F (-2.2°C).Humidity
The average relative humidity in December is 81%.Rainfall
In December, the rain falls for 4 days. Throughout December, 0.47" (12mm) of precipitation is accumulated. Throughout the year, there are 78.5 rainfall days, and 6.57" (167mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In Greenback, in December, snow falls for 3.3 days, with typically accumulated 0.16" (4mm) of snow. Throughout the year, there are 17.5 snowfall days, and 1.77" (45mm) 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 in Greenback, sunrise is at 7:11 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 4:48 pm EST.
Sunshine
The average sunshine in December is 4.3h.UV index
January through March, November and December, with an average maximum UV index of 2, are months 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 average person.Note: In December, the UV index of 2 transforms into the following advice:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Greenback, PA
- Average high temperature in December: 38.8°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 (32.2°F).
- Average low temperature in December: 28°F
The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).
Average pressure in December
Greenback, PA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Greenback, PA
- Average wind speed in December: 7.5mph
The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in December
Greenback, PA
- Average humidity in December: 81%
The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are March and April (77%).
Average rainfall in December
Greenback, PA
- Average rainfall in December: 0.47"
The wettest month (with the highest rainfall) is July (0.79").
The driest month (with the least rainfall) is September (0.24").
Average rainfall days in December
Greenback, PA
- Average rainfall days in December: 4 days
The month with the highest number of rainy days is July (10.4 days).
The month with the least rainy days is November (3.2 days).
Average snowfall in December
Greenback, PA
- Average snowfall in December: 0.16"
The months with the highest snowfall are January, February and March (0.43").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Greenback, PA
- Average snowfall days in December: 3.3 days
The month with the highest number of snowfall days is January (5.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Greenback, 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: 4h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 12min).
Average sunshine days in December
Greenback, PA
- Average sunshine days in December: 23.6 days
The month with the most sunshine days is January (24.4 days).
The month with the least sunshine days is July (16.5 days).
Average UV index in December
Greenback, PA
- Average UV index in December: 2
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Greenback, PA
- Average cloud cover in December: 54
The month with the most cloud cover is February (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in December
Greenback, PA
- Average visibility in December: 6mi
The months with the highest visibility are January, March, April, November and December (6mi).
The months with the lowest visibility are February, May, June, July, August, September and October (5mi).
