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
December ushers in a slight temperature change, with average high-temperatures reducing from November's cool 50°F (10°C) to an icy 40.6°F (4.8°C). The average temperature during December nights is registered at a subzero cold 29.3°F (-1.5°C).Humidity
In December, the average relative humidity is 80%.Rainfall
In December, the rain falls for 11.8 days. Throughout December, 2.44" (62mm) of precipitation is accumulated. In West Lawn, during the entire year, the rain falls for 158.3 days and collects up to 29.76" (756mm) of precipitation.Snowfall
Months with snowfall in West Lawn are January through May, October through December. In West Lawn, during December, snow falls for 4.4 days and regularly aggregates up to 1.54" (39mm) of snow. Throughout the year, there are 26.5 snowfall days, and 12.64" (321mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:08 am and sunset at 4:38 pm. On the last day of December, sunrise is at 7:26 am and sunset at 4:47 pm EST.
Sunshine
The average sunshine in December is 4.7h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.Note: A maximum high daily UV index of 2 during December translates into the following directions:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get 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 West Lawn have in December?
When is the lowest UV index?
What is the UV index reading in December?
Average temperature in December
West Lawn, PA
- Average high temperature in December: 40.6°F
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (35.1°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 (22.1°F).
Average pressure in December
West Lawn, PA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
West Lawn, PA
- Average wind speed in December: 7.9mph
The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
West Lawn, PA
- Average humidity in December: 80%
The months with the highest relative humidity are February and October (81%).
The month with the lowest relative humidity is April (76%).
Average rainfall in December
West Lawn, PA
- Average rainfall in December: 2.44"
The wettest month (with the highest rainfall) is August (2.95").
The driest month (with the least rainfall) is September (1.85").
Average rainfall days in December
West Lawn, PA
- Average rainfall days in December: 11.8 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is January (7.8 days).
Average snowfall in December
West Lawn, PA
- Average snowfall in December: 1.54"
The month with the highest snowfall is March (3.54").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
West Lawn, PA
- Average snowfall days in December: 4.4 days
The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
West Lawn, 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 24min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in December
West Lawn, PA
- Average sunshine days in December: 16.4 days
The month with the most sunshine days is November (17.8 days).
The month with the least sunshine days is May (11.2 days).
Average UV index in December
West Lawn, 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, March, November and December (UV index 2).
Average cloud cover in December
West Lawn, PA
- Average cloud cover in December: 50
The months with the most cloud cover are February and December (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
West Lawn, PA
- Average visibility in December: 6mi
The months with the highest visibility are January, March, April, June, July, November and December (6mi).
The months with the lowest visibility are February, May, August, September and October (5mi).
West Lawn, Pennsylvania, USA
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