December weather forecastBethel Park, PA
December
Weather in December
December, the first month of the winter in Bethel Park, is also an icy month, with an average temperature ranging between min 28.6°F (-1.9°C) and max 40.1°F (4.5°C).Temperature
The onset of December introduces a moderate change in Bethel Park's weather, with average high-temperatures falling from November's frosty 49.3°F (9.6°C) to a cold 40.1°F (4.5°C). In December, the nighttime temperature in Bethel Park lowers to an average of 28.6°F (-1.9°C).Humidity
In Bethel Park, the average relative humidity in December is 83%.Rainfall
In Bethel Park, during December, the rain falls for 13.4 days and regularly aggregates up to 3.03" (77mm) of precipitation. Throughout the year, there are 187.9 rainfall days, and 35.59" (904mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Bethel Park, during December, snow falls for 13 days and regularly aggregates up to 4.53" (115mm) of snow. In Bethel Park, during the entire year, snow falls for 60 days and aggregates up to 23.31" (592mm) of snow.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:24 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 5:04 pm EST.
Sunshine
The average sunshine in December is 3.4h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the ordinary person.Note: A maximum UV index of 1 in December translates into the following recommendations:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Take to heart! Snow reflection can almost magnify 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
Bethel Park, PA
- Average high temperature in December: 40.1°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in December: 28.6°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (21°F).
Average pressure in December
Bethel Park, 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
Bethel Park, PA
- Average wind speed in December: 7.2mph
The windiest month (with the highest average wind speed) is January (7.8mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).
Average humidity in December
Bethel Park, 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 (75%).
Average rainfall in December
Bethel Park, PA
- Average rainfall in December: 3.03"
The wettest month (with the highest rainfall) is May (3.66").
The driest month (with the least rainfall) is November (2.2").
Average rainfall days in December
Bethel Park, PA
- Average rainfall days in December: 13.4 days
The month with the highest number of rainy days is May (21.5 days).
The month with the least rainy days is February (11.3 days).
Average snowfall in December
Bethel Park, PA
- Average snowfall in December: 4.53"
The month with the highest snowfall is January (5.83").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Bethel Park, PA
- Average snowfall days in December: 13 days
The month with the highest number of snowfall days is January (17.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Bethel Park, PA
- Average daylight in December: 9h and 24min
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: 3h and 24min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in December
Bethel Park, PA
- Average sunshine days in December: 9.9 days
The month with the most sunshine days is November (15.1 days).
The month with the least sunshine days is January (7.7 days).
Average UV index in December
Bethel Park, 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
Bethel Park, PA
- Average cloud cover in December: 64
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in December
Bethel Park, 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 and February (4mi).
