December weather forecastKeffers, PA
December
Weather in December
The first month of the winter, December, is also a wintry month in Keffers, Pennsylvania, with an average temperature ranging between max 39.2°F (4°C) and min 28°F (-2.2°C).Temperature
The arrival of December corresponds with a reduction in the average high-temperature, down from November's chilly 48.2°F (9°C) to an icy 39.2°F (4°C). Keffers observes an average low-temperature of 28°F (-2.2°C) during December nights.Humidity
The average relative humidity in December is 81%.Rainfall
In Keffers, in December, during 5.5 rainfall days, 0.55" (14mm) of precipitation is typically accumulated. In Keffers, during the entire year, the rain falls for 100.8 days and collects up to 8.5" (216mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Keffers, in December, snow falls for 4.2 days, with typically accumulated 0.24" (6mm) of snow. Throughout the year, there are 21.7 snowfall days, and 2.48" (63mm) 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 the month, sunrise is at 7:10 am and sunset at 4:39 pm. On the last day of December, sunrise is at 7:29 am and sunset at 4:48 pm EST.
Sunshine
In December, the average sunshine 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 low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 2 in December translates into these instructions:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Warning! The reflection from snow can nearly 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
Keffers, PA
- Average high temperature in December: 39.2°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 (32.9°F).
- Average low temperature in December: 28°F
The month with the highest average low temperature is July (61.7°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure in December
Keffers, 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
Keffers, PA
- Average wind speed in December: 7.7mph
The windiest months (with the highest average wind speed) are March and April (8.5mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in December
Keffers, 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
Keffers, PA
- Average rainfall in December: 0.55"
The wettest month (with the highest rainfall) is July (1.1").
The driest month (with the least rainfall) is September (0.35").
Average rainfall days in December
Keffers, PA
- Average rainfall days in December: 5.5 days
The month with the highest number of rainy days is July (13.2 days).
The month with the least rainy days is January (4.5 days).
Average snowfall in December
Keffers, PA
- Average snowfall in December: 0.24"
The month with the highest snowfall is January (0.75").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Keffers, PA
- Average snowfall days in December: 4.2 days
The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Keffers, PA
- Average daylight in December: 9h and 18min
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 18min).
- Average sunshine in December: 4h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days in December
Keffers, PA
- Average sunshine days in December: 22.5 days
The month with the most sunshine days is November (22.8 days).
The month with the least sunshine days is July (14.6 days).
Average UV index in December
Keffers, 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
Keffers, PA
- Average cloud cover in December: 54
The months with the most cloud cover are February and December (Cloud cover 54).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in December
Keffers, 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).
