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 shift from November to December involves a decrease in the average high-temperature, from a frosty 46.4°F (8°C) to a wintry 36.5°F (2.5°C). December witnesses an average nighttime temperature of 26.1°F (-3.3°C).Humidity
In December, the average relative humidity in Cairnbrook is 85%.Rainfall
In Cairnbrook, in December, it is raining for 11.3 days, with typically 2.76" (70mm) of accumulated precipitation. In Cairnbrook, during the entire year, the rain falls for 170.8 days and collects up to 31.02" (788mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Cairnbrook, Pennsylvania, during December, snow falls for 11.5 days and regularly aggregates up to 5.2" (132mm) of snow. Throughout the year, there are 58.6 snowfall days, and 30.63" (778mm) of snow is accumulated.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:18 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:37 am and sunset at 4:59 pm EST.
Sunshine
The average sunshine in December 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. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The UV index of 2 during December translates into the following guidance:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. 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?
How much does it rain in December?
How much 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 Cairnbrook have in December?
What are the months with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Cairnbrook, PA
- Average high temperature in December: 36.5°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (30.9°F).
- Average low temperature in December: 26.1°F
The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is January (18.7°F).
Average pressure in December
Cairnbrook, 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
Cairnbrook, 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 (5.2mph).
Average humidity in December
Cairnbrook, PA
- Average humidity in December: 85%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is July (78%).
Average rainfall in December
Cairnbrook, PA
- Average rainfall in December: 2.76"
The wettest months (with the highest rainfall) are April and July (3.11").
The driest month (with the least rainfall) is November (1.65").
Average rainfall days in December
Cairnbrook, PA
- Average rainfall days in December: 11.3 days
The month with the highest number of rainy days is May (19.9 days).
The months with the least rainy days are February and November (8.9 days).
Average snowfall in December
Cairnbrook, PA
- Average snowfall in December: 5.2"
The month with the highest snowfall is January (6.97").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Cairnbrook, PA
- Average snowfall days in December: 11.5 days
The month with the highest number of snowfall days is January (14.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Cairnbrook, 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 month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days in December
Cairnbrook, PA
- Average sunshine days in December: 10.9 days
The month with the most sunshine days is November (15.7 days).
The month with the least sunshine days is May (9.3 days).
Average UV index in December
Cairnbrook, 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
Cairnbrook, PA
- Average cloud cover in December: 65
The month with the most cloud cover is January (Cloud cover 69).
The months with the least cloud cover are July and August (Cloud cover 39).
Average visibility in December
Cairnbrook, 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).
Cairnbrook, Pennsylvania, USA
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