December weather forecastIrvine, PA
December
Weather in December
December, the first month of the winter in Irvine, is also an icy month, with an average temperature fluctuating between 34.7°F (1.5°C) and 25.2°F (-3.8°C).Temperature
As December commences, the average high-temperature shows a reduction, transitioning from a chilly 44.1°F (6.7°C) in November to an icy 34.7°F (1.5°C). During December, Irvine records a consistent average nighttime temperature of 25.2°F (-3.8°C).Humidity
In Irvine, the average relative humidity in December is 88%.Rainfall
In Irvine, in December, during 10.2 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. Throughout the year, there are 162.1 rainfall days, and 21.81" (554mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. December is the month with the most snowfall. Snow falls for 18.1 days and accumulates 6.77" (172mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 12min of daylight.On the first day of December, sunrise is at 7:25 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:44 am and sunset at 4:56 pm EST.
Sunshine
The average sunshine in December is 2.3h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum UV index of 1 during December leads to these instructions:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Boost your sun resistance with garments that are densely woven yet spacious. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Irvine, PA
- Average high temperature in December: 34.7°F
The warmest month (with the highest average high temperature) is July (78.1°F).
The month with the lowest average high temperature is January (28.2°F).
- Average low temperature in December: 25.2°F
The month with the highest average low temperature is July (57.6°F).
The coldest month (with the lowest average low temperature) is January (16.9°F).
Average pressure in December
Irvine, PA
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Irvine, PA
- Average wind speed in December: 8.6mph
The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).
Average humidity in December
Irvine, PA
- Average humidity in December: 88%
The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is May (80%).
Average rainfall in December
Irvine, PA
- Average rainfall in December: 1.81"
The wettest month (with the highest rainfall) is April (2.52").
The driest month (with the least rainfall) is March (1.42").
Average rainfall days in December
Irvine, PA
- Average rainfall days in December: 10.2 days
The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is February (7.3 days).
Average snowfall in December
Irvine, PA
- Average snowfall in December: 6.77"
The month with the highest snowfall is December (6.77").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Irvine, PA
- Average snowfall days in December: 18.1 days
The month with the highest number of snowfall days is January (22 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Irvine, PA
- Average daylight in December: 9h and 12min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 2h and 18min
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: 2h and 6min).
Average sunshine days in December
Irvine, PA
- Average sunshine days in December: 6.6 days
The month with the most sunshine days is September (12.9 days).
The month with the least sunshine days is January (5.1 days).
Average UV index in December
Irvine, PA
- Average UV index in December: 1
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 and December (UV index 1).
Average cloud cover in December
Irvine, PA
- Average cloud cover in December: 77
The month with the most cloud cover is January (Cloud cover 80).
The months with the least cloud cover are July and August (Cloud cover 40).
Average visibility in December
Irvine, PA
- Average visibility in December: 4mi
The months with the highest visibility are March, April, May, June, July, September, October and November (5mi).
The months with the lowest visibility are January, February, August and December (4mi).
