December weather forecastLeolyn, PA
December
Weather in December
December, the first month of the winter in Leolyn, is also a wintry month, with an average temperature fluctuating between 34.7°F (1.5°C) and 25.5°F (-3.6°C).Temperature
Leolyn's average high-temperature decreases in December, falling from a chilly 44.8°F (7.1°C) in November to an icy 34.7°F (1.5°C). Leolyn observes an average nighttime temperature of 25.5°F (-3.6°C) during December.Humidity
In December, the average relative humidity is 84%.Rainfall
In Leolyn, in December, during 12.5 rainfall days, 2.09" (53mm) of precipitation is typically accumulated. In Leolyn, during the entire year, the rain falls for 171.9 days and collects up to 28.54" (725mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Leolyn. In Leolyn, in December, during 15.1 snowfall days, 5.39" (137mm) of snow is typically accumulated. Throughout the year, in Leolyn, there are 74.9 snowfall days, and 30.08" (764mm) of snow is accumulated.Daylight
The month with the shortest days in Leolyn is December, with an average of 9h and 12min of daylight.On the first day of December in Leolyn, sunrise is at 7:15 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 4:47 pm EST.
Sunshine
The months with the least sunshine are February and December, with an average of 3.2h of sunshine.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 minimal health hazard from unsafe exposure to UV radiation for the ordinary person.Note: In December, a daily UV index of 1 turns into the following recommendations:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Leolyn, PA
- Average high temperature in December: 34.7°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in December: 25.5°F
The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).
Average pressure in December
Leolyn, PA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Leolyn, PA
- Average wind speed in December: 8.2mph
The windiest month (with the highest average wind speed) is January (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
Leolyn, PA
- Average humidity in December: 84%
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is July (78%).
Average rainfall in December
Leolyn, PA
- Average rainfall in December: 2.09"
The wettest months (with the highest rainfall) are April and July (2.91").
The driest months (with the least rainfall) are January and November (1.77").
Average rainfall days in December
Leolyn, PA
- Average rainfall days in December: 12.5 days
The month with the highest number of rainy days is May (19 days).
The month with the least rainy days is February (8.6 days).
Average snowfall in December
Leolyn, PA
- Average snowfall in December: 5.39"
The month with the highest snowfall is February (7.2").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Leolyn, PA
- Average snowfall days in December: 15.1 days
The month with the highest number of snowfall days is January (18.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Leolyn, PA
- Average daylight in December: 9h and 12min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 3h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The months with the least sunshine are February and December (Average sunshine: 3h and 12min).
Average sunshine days in December
Leolyn, PA
- Average sunshine days in December: 8.9 days
The month with the most sunshine days is September (14 days).
The month with the least sunshine days is February (7.7 days).
Average UV index in December
Leolyn, 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
Leolyn, PA
- Average cloud cover in December: 67
The months with the most cloud cover are January, February and December (Cloud cover 67).
The month with the least cloud cover is July (Cloud cover 39).
Average visibility in December
Leolyn, PA
- Average visibility in December: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
