Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
With the beginning of December, the average high-temperature shows a decrease, transitioning from a frosty 44.1°F (6.7°C) in November to an icy 34.5°F (1.4°C). Sylvester's nights in December cool down to an average low-temperature of 24.6°F (-4.1°C).Humidity
The average relative humidity in December is 85%.Rainfall
In Sylvester, in December, it is raining for 12.1 days, with typically 2.2" (56mm) of accumulated precipitation. Throughout the year, in Sylvester, there are 168.3 rainfall days, and 28.19" (716mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Sylvester, in December, during 16.2 snowfall days, 6.02" (153mm) of snow is typically accumulated. Throughout the year, there are 80.4 snowfall days, and 33.03" (839mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:19 am and sunset at 4:39 pm. On the last day of December, sunrise is at 7:38 am and sunset at 4:49 pm EST.
Sunshine
January, February and December, with an average of 3.1h of sunshine, are months with the least sunshine in Sylvester.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Sylvester. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: A maximum daily UV index of 1 during December morphs into the following directions:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Frequently asked questions
How cold is it in Sylvester in December?
What is the average humidity in December in Sylvester?
How much does it rain in Sylvester in December?
How much does it snow in Sylvester in December?
What is the month with the shortest days in Sylvester?
How many hours of daylight does Sylvester have in December?
What time are sunrise and sunset in December in Sylvester?
What is the month with the least sunshine in Sylvester?
How long on average sun shines in December in Sylvester?
What are the months with the lowest UV index in Sylvester?
What is the UV index reading in December in Sylvester?
Average temperature in December
Sylvester, PA
- Average high temperature in December: 34.5°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (28.2°F).
- Average low temperature in December: 24.6°F
The month with the highest average low temperature is July (57°F).
The coldest month (with the lowest average low temperature) is January (16.9°F).
Average pressure in December
Sylvester, 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
Sylvester, PA
- Average wind speed in December: 8.9mph
The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in December
Sylvester, PA
- Average humidity in December: 85%
The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are April, May and June (78%).
Average rainfall in December
Sylvester, PA
- Average rainfall in December: 2.2"
The wettest month (with the highest rainfall) is April (2.95").
The driest month (with the least rainfall) is November (1.81").
Average rainfall days in December
Sylvester, PA
- Average rainfall days in December: 12.1 days
The month with the highest number of rainy days is July (18.9 days).
The month with the least rainy days is February (7.2 days).
Average snowfall in December
Sylvester, PA
- Average snowfall in December: 6.02"
The month with the highest snowfall is February (7.76").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Sylvester, PA
- Average snowfall days in December: 16.2 days
The month with the highest number of snowfall days is January (18.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Sylvester, PA
- Average daylight in December: 9h and 1min
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: 3h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 6min).
Average sunshine days in December
Sylvester, PA
- Average sunshine days in December: 8 days
The month with the most sunshine days is September (14.9 days).
The month with the least sunshine days is February (7.1 days).
Average UV index in December
Sylvester, 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
Sylvester, PA
- Average cloud cover in December: 70
The month with the most cloud cover is January (Cloud cover 71).
The month with the least cloud cover is August (Cloud cover 39).
Average visibility in December
Sylvester, 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).
Sylvester, Pennsylvania, USA
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