December weather forecastDeer Park, PA
December
Weather in December
The first month of the winter, December, is also an icy month in Deer Park, Pennsylvania, with an average temperature ranging between max 42.4°F (5.8°C) and min 30.7°F (-0.7°C).Temperature
The commencement of December indicates a shift in the average high-temperature, receding from November's cool 51.4°F (10.8°C) to a cold 42.4°F (5.8°C). December generally records an average low-temperature of 30.7°F (-0.7°C).Humidity
In Deer Park, the average relative humidity in December is 78%.Rainfall
In Deer Park, in December, during 11.3 rainfall days, 2.87" (73mm) of precipitation is typically accumulated. Throughout the year, there are 158.5 rainfall days, and 28.31" (719mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Deer Park, in December, during 3.7 snowfall days, 1.42" (36mm) of snow is typically accumulated. In Deer Park, during the entire year, snow falls for 23 days and aggregates up to 9.45" (240mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:04 am and sunset at 4:34 pm. On the last day of December, sunrise is at 7:22 am and sunset at 4:43 pm EST.
Sunshine
In Deer Park, the average sunshine in December is 4.9h.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 of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.Note: In December, a daily maximum UV index of 2 leads to the following instructions:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. To protect against the Sun's most potent rays, avoid direct exposure around midday. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Deer Park, PA
- Average high temperature in December: 42.4°F
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in December: 30.7°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (23.5°F).
Average pressure in December
Deer Park, PA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Deer Park, PA
- Average wind speed in December: 7.7mph
The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Deer Park, PA
- Average humidity in December: 78%
The months with the highest relative humidity are February and October (79%).
The months with the lowest relative humidity are April and July (74%).
Average rainfall in December
Deer Park, PA
- Average rainfall in December: 2.87"
The wettest month (with the highest rainfall) is July (2.99").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days in December
Deer Park, PA
- Average rainfall days in December: 11.3 days
The months with the highest number of rainy days are May and July (16.8 days).
The month with the least rainy days is November (8.9 days).
Average snowfall in December
Deer Park, PA
- Average snowfall in December: 1.42"
The month with the highest snowfall is March (2.91").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Deer Park, PA
- Average snowfall days in December: 3.7 days
The month with the highest number of snowfall days is January (7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Deer 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: 4h and 54min
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 42min).
Average sunshine days in December
Deer Park, PA
- Average sunshine days in December: 16.5 days
The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is June (11.7 days).
Average UV index in December
Deer Park, PA
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (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
Deer Park, PA
- Average cloud cover in December: 48
The months with the most cloud cover are February and December (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in December
Deer Park, PA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
