December weather forecastIrwin, PA
December
Weather in December
December, the first month of the winter in Irwin, is also an icy month, with temperature in the range of an average high of 39.6°F (4.2°C) and an average low of 28.6°F (-1.9°C).Temperature
A shift in Irwin's weather is observed as November turns into December, with the average high temperature reducing from a chilly 49.5°F (9.7°C) to a cold 39.6°F (4.2°C). In the month of December, Irwin records a consistent average low-temperature of 28.6°F (-1.9°C).Humidity
In Irwin, the average relative humidity in December is 84%.Rainfall
In Irwin, in December, during 11.2 rainfall days, 1.46" (37mm) of precipitation is typically accumulated. Throughout the year, in Irwin, there are 161.9 rainfall days, and 19.29" (490mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, October through December. In December, it is snowing for 10.1 days. Throughout December, 1.69" (43mm) of snow is accumulated. Throughout the year, there are 49.2 snowfall days, and 8.62" (219mm) 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 the month, sunrise is at 7:22 am and sunset at 4:53 pm. On the last day of December, in Irwin, sunrise is at 7:41 am and sunset at 5:02 pm EST.
Sunshine
In Irwin, 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 of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for average individuals.Note: The average daily UV index of 1 in December transforms into the following instructions:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Enhance your sun protection with tightly woven, yet airy clothing. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
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
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
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
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
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
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
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
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
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
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
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
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
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).
