December weather forecastYoungsville, PA
December
Weather in December
The first month of the winter, December, is still a cold month in Youngsville, Pennsylvania, with an average temperature varying between 34.7°F (1.5°C) and 25.2°F (-3.8°C).Temperature
The move into December indicates a reduction in the average high-temperature, down from November's frosty 44.1°F (6.7°C) to an icy 34.7°F (1.5°C). An average nighttime temperature of 25.2°F (-3.8°C) is noted during the month of December.Humidity
In Youngsville, the average relative humidity in December is 88%.Rainfall
In Youngsville, during December, the rain falls for 10.2 days and regularly aggregates up to 1.81" (46mm) of precipitation. In Youngsville, during the entire year, the rain falls for 162.1 days and collects up to 21.81" (554mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. The month with the most snowfall is December, when snow falls for 18.1 days and typically aggregates up to 6.77" (172mm) of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year in Youngsville.On the first day of the month, sunrise is at 7:25 am and sunset at 4:47 pm. On the last day of December, sunrise is at 7:44 am and sunset at 4:56 pm EST.
Sunshine
In December, the average sunshine is 2.3h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: During December, 1 as the daily maximum UV index converts into the following advice:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Youngsville, PA
- Average high temperature in December: 34.7°F
The warmest month (with the highest average high temperature) is July (78.1°F).
The month with the lowest average high temperature is January (28.2°F).
- Average low temperature in December: 25.2°F
The month with the highest average low temperature is July (57.6°F).
The coldest month (with the lowest average low temperature) is January (16.9°F).
Average pressure in December
Youngsville, PA
- Average pressure in December: 30.08"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
Youngsville, PA
- Average wind speed in December: 8.6mph
The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).
Average humidity in December
Youngsville, PA
- Average humidity in December: 88%
The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is May (80%).
Average rainfall in December
Youngsville, PA
- Average rainfall in December: 1.81"
The wettest month (with the highest rainfall) is April (2.52").
The driest month (with the least rainfall) is March (1.42").
Average rainfall days in December
Youngsville, PA
- Average rainfall days in December: 10.2 days
The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is February (7.3 days).
Average snowfall in December
Youngsville, PA
- Average snowfall in December: 6.77"
The month with the highest snowfall is December (6.77").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Youngsville, PA
- Average snowfall days in December: 18.1 days
The month with the highest number of snowfall days is January (22 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Youngsville, 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 18min
The months with the most sunshine are July and August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 2h and 6min).
Average sunshine days in December
Youngsville, PA
- Average sunshine days in December: 6.6 days
The month with the most sunshine days is September (12.9 days).
The month with the least sunshine days is January (5.1 days).
Average UV index in December
Youngsville, 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
Youngsville, PA
- Average cloud cover in December: 77
The month with the most cloud cover is January (Cloud cover 80).
The months with the least cloud cover are July and August (Cloud cover 40).
Average visibility in December
Youngsville, PA
- Average visibility in December: 4mi
The months with the highest visibility are March, April, May, June, July, September, October and November (5mi).
The months with the lowest visibility are January, February, August and December (4mi).
