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
The move into December indicates a reduction in the average high-temperature, down from November's chilly 46.4°F (8°C) to a cold 37.2°F (2.9°C). Throughout December, the nighttime temperature in Casselman averages to a subzero cold 25.7°F (-3.5°C).Humidity
In Casselman, the average relative humidity in December is 85%.Rainfall
In Casselman, in December, during 11.7 rainfall days, 3.27" (83mm) of precipitation is typically accumulated. Throughout the year, in Casselman, Pennsylvania, there are 183.2 rainfall days, and 35.94" (913mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. 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
December has the shortest days of the year in Casselman, with an average of 9h and 24min of daylight.On the first day of December, 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
In December, the average sunshine in Casselman is 3.6h.UV index
January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Casselman. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum high UV index of 2 in December translates into the following recommendations:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Frequently asked questions
How cold is it in Casselman in December?
What is the average humidity in December in Casselman?
How many days does it rain in December in Casselman?
How many days does it snow in December in Casselman?
What is the month with the shortest days in Casselman?
What is the average length of the day in December in Casselman?
What time are sunrise and sunset in December in Casselman?
How long on average sun shines in December in Casselman?
When is the lowest UV index in Casselman?
How high is the UV index in December in Casselman?
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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