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 corresponds with a decrease in average high-temperatures, from November's frosty 46.4°F (8°C) to an icy 37.2°F (2.9°C). During the month of December, an average low-temperature of 25.7°F (-3.5°C) is recorded.Humidity
In December, the average relative humidity in Casselman, Pennsylvania, is 85%.Rainfall
In December, the rain falls for 11.7 days. Throughout December, 3.27" (83mm) of precipitation is accumulated. In Casselman, during the entire year, the rain falls for 183.2 days and collects up to 35.94" (913mm) of precipitation.Snowfall
Months with snowfall in Casselman are January through May, October through December. In Casselman, in December, during 12.5 snowfall days, 5.16" (131mm) of snow is typically accumulated. In Casselman, during the entire year, snow falls for 68.3 days and aggregates up to 33.39" (848mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of December in Casselman, sunrise is at 7:19 am and sunset at 4:52 pm. On the last day of the month, sunrise is at 7:38 am and sunset at 5:02 pm EST.
Sunshine
The average sunshine in December is 3.6h.UV index
The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum high daily UV index of 2 during December translates into the following directions:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Always opt for UVA and UVB-resistant sunglasses on radiant days. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
How many hours of sunshine does Casselman have in December?
What is the month with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Casselman, PA
- Average high temperature in December: 37.2°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (31.5°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 (18.9°F).
Average pressure in December
Casselman, 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
Casselman, PA
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
Casselman, PA
- Average humidity in December: 85%
The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are April, June and July (79%).
Average rainfall in December
Casselman, PA
- Average rainfall in December: 3.27"
The wettest month (with the highest rainfall) is May (3.94").
The driest month (with the least rainfall) is November (2.09").
Average rainfall days in December
Casselman, PA
- Average rainfall days in December: 11.7 days
The month with the highest number of rainy days is May (22.8 days).
The month with the least rainy days is January (9.4 days).
Average snowfall in December
Casselman, PA
- Average snowfall in December: 5.16"
The month with the highest snowfall is January (7.44").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Casselman, PA
- Average snowfall days in December: 12.5 days
The month with the highest number of snowfall days is January (17.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Casselman, 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 4min
The months with the most sunshine are July and August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).
Average sunshine days in December
Casselman, PA
- Average sunshine days in December: 9.2 days
The months with the most sunshine days are October and November (12.5 days).
The month with the least sunshine days is May (6.2 days).
Average UV index in December
Casselman, PA
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in December
Casselman, PA
- Average cloud cover in December: 65
The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 40).
Average visibility in December
Casselman, PA
- Average visibility in December: 4mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (5mi).
The months with the lowest visibility are January, February and December (4mi).
Casselman, Pennsylvania, USA
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