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 to December brings a decrease in the average high-temperature, falling from a chilly 42.8°F (6°C) in November to a subzero cold 31.6°F (-0.2°C). An average low-temperature of 22.5°F (-5.3°C) marks the month of December in Philadelphia.Humidity
In December, the average relative humidity is 85%.Rainfall
In Philadelphia, in December, it is raining for 11.6 days, with typically 2.87" (73mm) of accumulated precipitation. In Philadelphia, during the entire year, the rain falls for 166.4 days and collects up to 30.55" (776mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. December is the month with the most snowfall in Philadelphia. Snow falls for 17.4 days and accumulates 9.13" (232mm) of snow.Daylight
December has the shortest days of the year in Philadelphia, with an average of 8h and 54min of daylight.On the first day of December in Philadelphia, sunrise is at 7:18 am and sunset at 4:25 pm. On the last day of the month, sunrise is at 7:37 am and sunset at 4:34 pm EST.
Sunshine
In December, the average sunshine in Philadelphia is 3.2h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for the average person.Note: The maximum daily UV index of 1 in December converts into the following recommendations:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. To protect against the Sun's most potent rays, avoid direct exposure around midday. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Philadelphia?
What is the average humidity in December in Philadelphia?
How much does it rain in Philadelphia in December?
When does it snow the most in Philadelphia?
How much does it snow in Philadelphia in December?
What is the month with the shortest days in Philadelphia?
How many hours of daylight does Philadelphia have in December?
When are sunrise and sunset in December in Philadelphia?
How many hours of sunshine does Philadelphia have in December?
When is the lowest UV index in Philadelphia?
What is the UV index reading in December in Philadelphia?
Average temperature in December
Philadelphia, NY
- Average high temperature in December: 31.6°F
The warmest month (with the highest average high temperature) is July (76.6°F).
The month with the lowest average high temperature is January (25°F).
- Average low temperature in December: 22.5°F
The month with the highest average low temperature is July (59.7°F).
The coldest month (with the lowest average low temperature) is January (13.1°F).
Average pressure in December
Philadelphia, NY
- Average pressure in December: 30.05"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Philadelphia, NY
- Average wind speed in December: 9.2mph
The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity in December
Philadelphia, NY
- Average humidity in December: 85%
The months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is April (77%).
Average rainfall in December
Philadelphia, NY
- Average rainfall in December: 2.87"
The wettest month (with the highest rainfall) is October (3.39").
The driest month (with the least rainfall) is September (1.77").
Average rainfall days in December
Philadelphia, NY
- Average rainfall days in December: 11.6 days
The month with the highest number of rainy days is October (17.4 days).
The month with the least rainy days is February (8.1 days).
Average snowfall in December
Philadelphia, NY
- Average snowfall in December: 9.13"
The month with the highest snowfall is December (9.13").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Philadelphia, NY
- Average snowfall days in December: 17.4 days
The month with the highest number of snowfall days is January (20.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Philadelphia, NY
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in December: 3h and 1min
The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The months with the least sunshine are January and February (Average sunshine: 2h and 54min).
Average sunshine days in December
Philadelphia, NY
- Average sunshine days in December: 7.6 days
The month with the most sunshine days is September (14.8 days).
The month with the least sunshine days is February (6.9 days).
Average UV index in December
Philadelphia, NY
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Philadelphia, NY
- Average cloud cover in December: 68
The months with the most cloud cover are January and February (Cloud cover 71).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in December
Philadelphia, NY
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
Philadelphia, New York, USA
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