December weather forecastCastanea, PA
December
Weather in December
December, the first month of the winter in Castanea, is also an icy month, with an average temperature varying between 36.7°F (2.6°C) and 25.9°F (-3.4°C).Temperature
The decrease of average high-temperatures is mild in December, with a decline from a chilly 46.2°F (7.9°C) in November to an icy 36.7°F (2.6°C). During the month of December, an average temperature of 25.9°F (-3.4°C) is noted during the nights.Humidity
The months with the highest humidity in Castanea are February and December, with an average relative humidity of 84%.Rainfall
In Castanea, in December, during 12.4 rainfall days, 2.68" (68mm) of precipitation is typically accumulated. Throughout the year, there are 174.7 rainfall days, and 32.09" (815mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Castanea, in December, snow falls for 12.2 days, with typically accumulated 4.76" (121mm) of snow. Throughout the year, there are 56.1 snowfall days, and 24.84" (631mm) 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 December, sunrise is at 7:16 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 4:51 pm EST.
Sunshine
In December, the average sunshine is 3.4h.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 vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, the maximum UV index of 1 suggests these recommendations:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. Avoiding the Sun during its peak radiation time around midday is a healthy practice. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Take to heart! Snow reflection can almost magnify 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
Castanea, PA
- Average high temperature in December: 36.7°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (30.9°F).
- Average low temperature in December: 25.9°F
The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure in December
Castanea, PA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
Castanea, PA
- Average wind speed in December: 7mph
The windiest months (with the highest average wind speed) are January and April (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Castanea, PA
- Average humidity in December: 84%
The months with the highest relative humidity are February and December (84%).
The months with the lowest relative humidity are April, June and July (77%).
Average rainfall in December
Castanea, PA
- Average rainfall in December: 2.68"
The wettest month (with the highest rainfall) is April (3.54").
The driest month (with the least rainfall) is November (2.09").
Average rainfall days in December
Castanea, PA
- Average rainfall days in December: 12.4 days
The month with the highest number of rainy days is May (18.7 days).
The month with the least rainy days is February (10.3 days).
Average snowfall in December
Castanea, PA
- Average snowfall in December: 4.76"
The month with the highest snowfall is February (7.13").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Castanea, PA
- Average snowfall days in December: 12.2 days
The month with the highest number of snowfall days is January (15.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Castanea, 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 24min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).
Average sunshine days in December
Castanea, PA
- Average sunshine days in December: 10.3 days
The month with the most sunshine days is September (15.5 days).
The month with the least sunshine days is February (8.8 days).
Average UV index in December
Castanea, 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
Castanea, PA
- Average cloud cover in December: 64
The months with the most cloud cover are January and December (Cloud cover 64).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in December
Castanea, PA
- Average visibility in December: 4mi
The months with the highest visibility are January, March, April, May, June, July, August, October and November (5mi).
The months with the lowest visibility are February, September and December (4mi).
