December weather forecastThornwood, PA
December
Weather in December
December, the first month of the winter in Thornwood, is still a cold month, with temperature in the range of an average high of 39.2°F (4°C) and an average low of 27.7°F (-2.4°C).Temperature
Thornwood in December experiences a subtle temperature decline, with average high-temperatures reducing from a chilly 48.9°F (9.4°C) in November to a wintry 39.2°F (4°C). Thornwood in December experiences a low-temperature average of 27.7°F (-2.4°C).Humidity
In Thornwood, the average relative humidity in December is 84%.Rainfall
In Thornwood, Pennsylvania, in December, during 13.1 rainfall days, 3.03" (77mm) of precipitation is typically accumulated. In Thornwood, during the entire year, the rain falls for 185.4 days and collects up to 34.02" (864mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Thornwood, in December, snow falls for 12.8 days, with typically accumulated 6.1" (155mm) of snow. Throughout the year, in Thornwood, there are 63.2 snowfall days, and 29.02" (737mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 24min of daylight.On the first day of December in Thornwood, sunrise is at 7:21 am and sunset at 4:53 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 5:02 pm EST.
Sunshine
In December, the average sunshine is 3.6h.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 estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index of 2 in December converts into the following recommendations:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Thornwood, PA
- Average high temperature in December: 39.2°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.3°F).
- Average low temperature in December: 27.7°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure in December
Thornwood, PA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
Thornwood, PA
- Average wind speed in December: 7.9mph
The windiest month (with the highest average wind speed) is January (8.5mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Thornwood, PA
- Average humidity in December: 84%
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are April, July and August (77%).
Average rainfall in December
Thornwood, PA
- Average rainfall in December: 3.03"
The wettest month (with the highest rainfall) is May (3.66").
The driest month (with the least rainfall) is November (2.01").
Average rainfall days in December
Thornwood, PA
- Average rainfall days in December: 13.1 days
The month with the highest number of rainy days is May (22 days).
The month with the least rainy days is January (9.8 days).
Average snowfall in December
Thornwood, PA
- Average snowfall in December: 6.1"
The month with the highest snowfall is January (7.09").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Thornwood, PA
- Average snowfall days in December: 12.8 days
The month with the highest number of snowfall days is January (17.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Thornwood, PA
- Average daylight in December: 9h and 24min
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 24min).
- Average sunshine in December: 3h and 36min
The month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in December
Thornwood, PA
- Average sunshine days in December: 9.7 days
The month with the most sunshine days is November (13.5 days).
The month with the least sunshine days is January (6.5 days).
Average UV index in December
Thornwood, PA
- Average UV index in December: 2
The month with the highest UV index is July (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
Thornwood, PA
- Average cloud cover in December: 64
The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in December
Thornwood, PA
- Average visibility in December: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January and February (4mi).
