December weather forecastLewis Run, PA
December
Weather in December
The first month of the winter, December, is also an icy month in Lewis Run, Pennsylvania, with an average temperature ranging between min 23.9°F (-4.5°C) and max 34°F (1.1°C).Temperature
The arrival of December corresponds with a shift in temperature, down from a frosty 43.3°F (6.3°C) in November to an icy 34°F (1.1°C). December's average low-temperature reading settles at a freezing cold 23.9°F (-4.5°C).Humidity
In Lewis Run, the average relative humidity in December is 88%.Rainfall
In Lewis Run, during December, the rain falls for 10 days and regularly aggregates up to 3.15" (80mm) of precipitation. In Lewis Run, during the entire year, the rain falls for 176.7 days and collects up to 34.76" (883mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Lewis Run, Pennsylvania, in December, during 20.7 snowfall days, 12.17" (309mm) of snow is typically accumulated. In Lewis Run, during the entire year, snow falls for 103 days and aggregates up to 61.22" (1555mm) of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:23 am and sunset at 4:44 pm. On the last day of December, sunrise is at 7:42 am and sunset at 4:53 pm EST.
Sunshine
The average sunshine in December is 2.5h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 1 during December translates into the following directions:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Lewis Run, PA
- Average high temperature in December: 34°F
The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in December: 23.9°F
The month with the highest average low temperature is July (56.8°F).
The coldest month (with the lowest average low temperature) is January (15.6°F).
Average pressure in December
Lewis Run, 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
Lewis Run, PA
- Average wind speed in December: 8.6mph
The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).
Average humidity in December
Lewis Run, PA
- Average humidity in December: 88%
The month with the highest relative humidity is February (89%).
The months with the lowest relative humidity are May, June and July (79%).
Average rainfall in December
Lewis Run, PA
- Average rainfall in December: 3.15"
The wettest month (with the highest rainfall) is April (3.94").
The driest month (with the least rainfall) is September (2.17").
Average rainfall days in December
Lewis Run, PA
- Average rainfall days in December: 10 days
The month with the highest number of rainy days is May (19.8 days).
The month with the least rainy days is January (8 days).
Average snowfall in December
Lewis Run, PA
- Average snowfall in December: 12.17"
The month with the highest snowfall is February (13.74").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Lewis Run, PA
- Average snowfall days in December: 20.7 days
The month with the highest number of snowfall days is January (23 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Lewis Run, PA
- Average daylight in December: 9h and 12min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 2h and 30min
The month with the most sunshine is July (Average sunshine: 9h and 30min).
The month with the least sunshine is January (Average sunshine: 2h and 24min).
Average sunshine days in December
Lewis Run, PA
- Average sunshine days in December: 5.5 days
The month with the most sunshine days is September (12.2 days).
The month with the least sunshine days is January (4.8 days).
Average UV index in December
Lewis Run, PA
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Lewis Run, PA
- Average cloud cover in December: 77
The month with the most cloud cover is January (Cloud cover 79).
The months with the least cloud cover are July and August (Cloud cover 43).
Average visibility in December
Lewis Run, PA
- Average visibility in December: 4mi
The months with the highest visibility are March, April, May, June, July, October and November (5mi).
The months with the lowest visibility are January, February, August, September and December (4mi).
