December weather forecastChalkhill, PA
December
Weather in December
The first month of the winter, December, is still a cold month in Chalkhill, Pennsylvania, with an average temperature ranging between max 39.6°F (4.2°C) and min 27.5°F (-2.5°C).Temperature
Chalkhill observes a small decrease in the average high-temperature with the arrival of December, falling from November's frosty 48.6°F (9.2°C) to a wintry 39.6°F (4.2°C). December witnesses an average low-temperature hovering around a subzero cold 27.5°F (-2.5°C).Humidity
In December, the average relative humidity is 85%.Rainfall
In December, the rain falls for 12.4 days. Throughout December, 2.83" (72mm) of precipitation is accumulated. In Chalkhill, during the entire year, the rain falls for 189.4 days and collects up to 32.95" (837mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Chalkhill, in December, snow falls for 8.3 days, with typically accumulated 3.46" (88mm) of snow. Throughout the year, there are 42 snowfall days, and 17.68" (449mm) 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 the month, sunrise is at 7:21 am and sunset at 4:54 pm. On the last day of December, sunrise is at 7:39 am and sunset at 5:03 pm EST.
Sunshine
In December, the average sunshine is 3.6h.UV index
December is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum UV index of 1 during December translates into these guidelines:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Chalkhill, PA
- Average high temperature in December: 39.6°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (33.3°F).
- Average low temperature in December: 27.5°F
The month with the highest average low temperature is July (60.3°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure in December
Chalkhill, 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
Chalkhill, PA
- Average wind speed in December: 7.8mph
The windiest month (with the highest average wind speed) is January (8.6mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in December
Chalkhill, PA
- Average humidity in December: 85%
The months with the highest relative humidity are January and February (86%).
The months with the lowest relative humidity are June, July and August (78%).
Average rainfall in December
Chalkhill, PA
- Average rainfall in December: 2.83"
The wettest month (with the highest rainfall) is May (3.74").
The driest month (with the least rainfall) is November (1.81").
Average rainfall days in December
Chalkhill, PA
- Average rainfall days in December: 12.4 days
The month with the highest number of rainy days is May (21.5 days).
The month with the least rainy days is November (10.5 days).
Average snowfall in December
Chalkhill, PA
- Average snowfall in December: 3.46"
The month with the highest snowfall is January (5.39").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Chalkhill, PA
- Average snowfall days in December: 8.3 days
The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Chalkhill, 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: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in December
Chalkhill, PA
- Average sunshine days in December: 13 days
The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is May (8 days).
Average UV index in December
Chalkhill, PA
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Chalkhill, PA
- Average cloud cover in December: 65
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 37).
Average visibility in December
Chalkhill, PA
- Average visibility in December: 5mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (5mi).
The month with the lowest visibility is January (4mi).
