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
December's arrival correlates with a reduction in the average high-temperature, down from a chilly 49.5°F (9.7°C) in November to an icy 40.1°F (4.5°C). Throughout the December nights, Green Hills encounters a low-temperature of 28.6°F (-1.9°C).Humidity
In Green Hills, the average relative humidity in December is 84%.Rainfall
In Green Hills, in December, during 9.4 rainfall days, 1.06" (27mm) of precipitation is typically accumulated. In Green Hills, during the entire year, the rain falls for 143 days and collects up to 14.8" (376mm) of precipitation.Snowfall
Months with snowfall in Green Hills are January through May, October through December. In Green Hills, Pennsylvania, in December, during 6.5 snowfall days, 0.83" (21mm) of snow is typically accumulated. Throughout the year, in Green Hills, Pennsylvania, there are 33.5 snowfall days, and 4.88" (124mm) of snow is accumulated.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year.On the first day of December in Green Hills, sunrise is at 7:24 am and sunset at 4:56 pm. On the last day of the month, sunrise is at 7:43 am and sunset at 5:05 pm EST.
Sunshine
In December, the average sunshine is 3.5h.UV index
The month with the lowest UV index in Green Hills is December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for the ordinary person.Note: The UV index of 1 in December translates into these instructions:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Enhance your sun protection with tightly woven, yet airy clothing. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Frequently asked questions
Is December cold in Green Hills?
What is the average humidity in December in Green Hills?
How much does it rain in Green Hills in December?
How much does it snow in Green Hills in December?
What is the month with the shortest days in Green Hills?
How many hours of daylight does Green Hills have in December?
What time are sunrise and sunset in December in Green Hills?
How many hours of sunshine does Green Hills have in December?
When is the lowest UV index in Green Hills?
What is the UV index reading in December in Green Hills?
Average temperature in December
Green Hills, PA
- Average high temperature in December: 40.1°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (33.6°F).
- Average low temperature in December: 28.6°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 (20.8°F).
Average pressure in December
Green Hills, 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
Green Hills, PA
- Average wind speed in December: 7.1mph
The windiest month (with the highest average wind speed) is January (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).
Average humidity in December
Green Hills, PA
- Average humidity in December: 84%
The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are April, July and August (77%).
Average rainfall in December
Green Hills, PA
- Average rainfall in December: 1.06"
The wettest month (with the highest rainfall) is July (1.65").
The driest months (with the least rainfall) are January and November (0.94").
Average rainfall days in December
Green Hills, PA
- Average rainfall days in December: 9.4 days
The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is February (7.3 days).
Average snowfall in December
Green Hills, PA
- Average snowfall in December: 0.83"
The month with the highest snowfall is February (1.26").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Green Hills, PA
- Average snowfall days in December: 6.5 days
The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Green Hills, 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 24min).
- Average sunshine in December: 3h and 3min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in December
Green Hills, PA
- Average sunshine days in December: 17.5 days
The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in December
Green Hills, PA
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Green Hills, PA
- Average cloud cover in December: 64
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in December
Green Hills, PA
- Average visibility in December: 5mi
The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).
Green Hills, Pennsylvania, USA
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