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
A decrease in the average high-temperature is observed during December, shifting from a cool 50.7°F (10.4°C) in November to a wintry 41.5°F (5.3°C). An average minimum temperature of 29.3°F (-1.5°C) is recorded during the month of December.Humidity
The average relative humidity in December is 78%.Rainfall
In December, the rain falls for 11.2 days. Throughout December, 2.24" (57mm) of precipitation is accumulated. Throughout the year, in State Line, there are 164.7 rainfall days, and 29.17" (741mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, October through December. In State Line, during December, snow falls for 5.2 days and regularly aggregates up to 2.17" (55mm) of snow. Throughout the year, there are 28.6 snowfall days, and 14.65" (372mm) of snow is accumulated.Daylight
The month with the shortest days in State Line is December, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:13 am and sunset at 4:46 pm. On the last day of December, in State Line, sunrise is at 7:31 am and sunset at 4:56 pm EST.
Sunshine
In December, the average sunshine is 4.9h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.Note: The UV index of 2 during December leads to these advisories:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does State Line have in December?
What time are sunrise and sunset in December?
How many hours of sunshine does State Line have in December?
What are the months with the lowest UV index in State Line?
How high is the UV index in December?
Average temperature in December
State Line, PA
- Average high temperature in December: 41.5°F
The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in December: 29.3°F
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (22.8°F).
Average pressure in December
State Line, PA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
State Line, PA
- Average wind speed in December: 7mph
The windiest month (with the highest average wind speed) is January (7.7mph).
The calmest months (with the lowest average wind speed) are July and August (4.5mph).
Average humidity in December
State Line, PA
- Average humidity in December: 78%
The months with the highest relative humidity are May and October (79%).
The months with the lowest relative humidity are April and July (75%).
Average rainfall in December
State Line, PA
- Average rainfall in December: 2.24"
The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is February (1.97").
Average rainfall days in December
State Line, 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 (8.8 days).
Average snowfall in December
State Line, PA
- Average snowfall in December: 2.17"
The month with the highest snowfall is January (4.21").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
State Line, PA
- Average snowfall days in December: 5.2 days
The month with the highest number of snowfall days is January (9 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
State Line, PA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in December
State Line, PA
- Average sunshine days in December: 16.3 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (10.7 days).
Average UV index in December
State Line, PA
- Average UV index in December: 2
The months with the highest UV index are May, June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
State Line, PA
- Average cloud cover in December: 49
The months with the most cloud cover are January, February, March and December (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
State Line, PA
- Average visibility in December: 6mi
The months with the highest visibility are April, June, July, August, November and December (6mi).
The months with the lowest visibility are January, February, March, May, September and October (5mi).
State Line, Pennsylvania, USA
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