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
In Keyser Valley, the beginning of December is marked by a lowered average high-temperature, shifting from November's frosty 45.5°F (7.5°C) to a wintry 35.6°F (2°C). Keyser Valley, in December, experiences an average temperature of 25.7°F (-3.5°C) at night.Humidity
In December, the average relative humidity is 84%.Rainfall
In Keyser Valley, in December, during 11.7 rainfall days, 2.32" (59mm) of precipitation is typically accumulated. Throughout the year, there are 165.6 rainfall days, and 30.31" (770mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Keyser Valley, during December, snow falls for 13.4 days and regularly aggregates up to 5.94" (151mm) of snow. In Keyser Valley, during the entire year, snow falls for 67.9 days and aggregates up to 33.62" (854mm) of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:10 am and sunset at 4:33 pm. On the last day of December, sunrise is at 7:28 am and sunset at 4:43 pm EST.
Sunshine
In December, the average sunshine is 3.5h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index in Keyser Valley. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the average person.Note: A maximum UV index of 1 in December translates into the following recommendations:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December in Keyser Valley?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Keyser Valley have in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
When is the lowest UV index in Keyser Valley?
What is the UV index intensity in December?
Average temperature in December
Keyser Valley, PA
- Average high temperature in December: 35.6°F
The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (29.8°F).
- Average low temperature in December: 25.7°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°F).
Average pressure in December
Keyser Valley, 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
Keyser Valley, PA
- Average wind speed in December: 7.8mph
The windiest months (with the highest average wind speed) are January, February, March and April (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Keyser Valley, 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
Keyser Valley, PA
- Average rainfall in December: 2.32"
The wettest month (with the highest rainfall) is July (3.15").
The driest month (with the least rainfall) is September (2.01").
Average rainfall days in December
Keyser Valley, PA
- Average rainfall days in December: 11.7 days
The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is January (7.3 days).
Average snowfall in December
Keyser Valley, PA
- Average snowfall in December: 5.94"
The month with the highest snowfall is February (9.13").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Keyser Valley, PA
- Average snowfall days in December: 13.4 days
The month with the highest number of snowfall days is January (16.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Keyser Valley, PA
- Average daylight in December: 9h and 1min
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 12min).
- Average sunshine in December: 3h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The months with the least sunshine are January and February (Average sunshine: 3h and 24min).
Average sunshine days in December
Keyser Valley, PA
- Average sunshine days in December: 10.1 days
The month with the most sunshine days is September (15 days).
The month with the least sunshine days is May (9.3 days).
Average UV index in December
Keyser Valley, 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
Keyser Valley, PA
- Average cloud cover in December: 65
The months with the most cloud cover are January, February and December (Cloud cover 65).
The month with the least cloud cover is July (Cloud cover 38).
Average visibility in December
Keyser Valley, 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).
Keyser Valley, Pennsylvania, USA
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