December weather forecastNorth Irwin, PA
December
Weather in December
The first month of the winter, December, is also an icy month in North Irwin, Pennsylvania, with temperature in the range of an average low of 28.6°F (-1.9°C) and an average high of 39.6°F (4.2°C).Temperature
Start of December brings a shift in the average high-temperature, falling from November's frosty 49.5°F (9.7°C) to a wintry 39.6°F (4.2°C). In the month of December, North Irwin witnesses a consistent average low-temperature of 28.6°F (-1.9°C).Humidity
In December, the average relative humidity is 84%.Rainfall
In North Irwin, in December, it is raining for 11.2 days, with typically 1.46" (37mm) of accumulated precipitation. Throughout the year, there are 161.9 rainfall days, and 19.29" (490mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. In North Irwin, in December, during 10.1 snowfall days, 1.69" (43mm) of snow is typically accumulated. Throughout the year, there are 49.2 snowfall days, and 8.62" (219mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:23 am and sunset at 4:53 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 5:02 pm EST.
Sunshine
The average sunshine in December is 3.5h.UV index
December is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the average person.Note: A daily maximum UV index of 1 in December translates into the following instructions:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
North Irwin, PA
- Average high temperature in December: 39.6°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (33.6°F).
- Average low temperature in December: 28.6°F
The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).
Average pressure in December
North Irwin, PA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
North Irwin, PA
- Average wind speed in December: 7.4mph
The windiest month (with the highest average wind speed) is January (8mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in December
North Irwin, PA
- Average humidity in December: 84%
The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are April, July and August (76%).
Average rainfall in December
North Irwin, PA
- Average rainfall in December: 1.46"
The wettest month (with the highest rainfall) is May (2.28").
The driest months (with the least rainfall) are January and November (1.14").
Average rainfall days in December
North Irwin, PA
- Average rainfall days in December: 11.2 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is January (9.1 days).
Average snowfall in December
North Irwin, PA
- Average snowfall in December: 1.69"
The month with the highest snowfall is January (2.13").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
North Irwin, PA
- Average snowfall days in December: 10.1 days
The month with the highest number of snowfall days is January (14.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
North Irwin, 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 30min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in December
North Irwin, PA
- Average sunshine days in December: 12.1 days
The month with the most sunshine days is November (17 days).
The month with the least sunshine days is February (9 days).
Average UV index in December
North Irwin, PA
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
North Irwin, PA
- Average cloud cover in December: 64
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in December
North Irwin, PA
- Average visibility in December: 5mi
The months with the highest visibility are April, June, July, August and November (6mi).
The months with the lowest visibility are January, February, March, May, September, October and December (5mi).
