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
As December begins in Pittsburgh, Pennsylvania, there is a decrease in the average high-temperature, falling from a chilly 49.1°F (9.5°C) in November to a cold 39.4°F (4.1°C). The average low-temperature, in December, is a subzero cold 28.4°F (-2°C).Humidity
In Pittsburgh, the average relative humidity in December is 83%.Rainfall
In Pittsburgh, during December, the rain falls for 10.5 days and regularly aggregates up to 2.13" (54mm) of precipitation. Throughout the year, there are 163.6 rainfall days, and 26.93" (684mm) of precipitation is accumulated.Snowfall
Months with snowfall in Pittsburgh are January through April, October through December. In Pittsburgh, during December, snow falls for 10.3 days and regularly aggregates up to 2.01" (51mm) of snow. In Pittsburgh, during the entire year, snow falls for 47.7 days and aggregates up to 11.77" (299mm) of snow.Daylight
December has the shortest days of the year in Pittsburgh, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:24 am and sunset at 4:54 pm. On the last day of December, sunrise is at 7:43 am and sunset at 5:03 pm EST.
Sunshine
The average sunshine in December is 3.2h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, the maximum UV index of 1 translates into these guidelines:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. When the Sun is at its strongest around midday, find shade and limit exposure. Experience reduced UV exposure by about half when donning a wide-brim hat. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
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 is the sunrise / sunset in December?
How many hours of sunshine does Pittsburgh have in December?
When is the lowest UV index in Pittsburgh?
What is the UV index intensity in December?
Average temperature in December
Pittsburgh, PA
- Average high temperature in December: 39.4°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (33.1°F).
- Average low temperature in December: 28.4°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (21°F).
Average pressure in December
Pittsburgh, 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
Pittsburgh, PA
- Average wind speed in December: 7.3mph
The windiest month (with the highest average wind speed) is January (8mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).
Average humidity in December
Pittsburgh, PA
- Average humidity in December: 83%
The months with the highest relative humidity are January and February (84%).
The months with the lowest relative humidity are July and August (73%).
Average rainfall in December
Pittsburgh, PA
- Average rainfall in December: 2.13"
The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is November (1.54").
Average rainfall days in December
Pittsburgh, PA
- Average rainfall days in December: 10.5 days
The month with the highest number of rainy days is May (18.9 days).
The month with the least rainy days is January (8.9 days).
Average snowfall in December
Pittsburgh, PA
- Average snowfall in December: 2.01"
The month with the highest snowfall is January (3.31").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Pittsburgh, PA
- Average snowfall days in December: 10.3 days
The month with the highest number of snowfall days is January (14.4 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
Pittsburgh, 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 18min).
- Average sunshine in December: 3h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).
Average sunshine days in December
Pittsburgh, PA
- Average sunshine days in December: 11.5 days
The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is February (9.6 days).
Average UV index in December
Pittsburgh, PA
- Average UV index in December: 1
The months with the highest UV index are May, June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Pittsburgh, PA
- Average cloud cover in December: 67
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in December
Pittsburgh, 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).
Pittsburgh, Pennsylvania, USA
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