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
December's arrival comes with a decrease in the average high-temperature, moving from a frosty 49.5°F (9.7°C) in November to a wintry 40.1°F (4.5°C). An average low-temperature of 28.6°F (-1.9°C) marks the month of December.Humidity
In December, the average relative humidity is 81%.Rainfall
In December, the rain falls for 10.8 days. Throughout December, 2.01" (51mm) of precipitation is accumulated. In Shartlesville, during the entire year, the rain falls for 148.7 days and collects up to 26.42" (671mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Shartlesville, Pennsylvania. In December, in Shartlesville, it is snowing for 4.5 days. Throughout December, 1.38" (35mm) of snow is accumulated. In Shartlesville, during the entire year, snow falls for 26.2 days and aggregates up to 13.58" (345mm) of snow.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:09 am and sunset at 4:38 pm. On the last day of December, sunrise is at 7:27 am and sunset at 4:47 pm EST.
Sunshine
In December, the average sunshine is 4.6h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Shartlesville. A UV Index value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The average daily UV index of 2 in December transforms into the following instructions:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Frequently asked questions
How cold is December in Shartlesville?
What is the average humidity in December in Shartlesville?
How much does it rain in Shartlesville in December?
How many days does it snow in December in Shartlesville?
What is the month with the shortest days in Shartlesville?
How many hours of daylight does Shartlesville have in December?
When is the sunrise / sunset in December in Shartlesville?
How long on average sun shines in December in Shartlesville?
What is the month with the lowest UV index in Shartlesville?
How high is the UV index in December in Shartlesville?
Average temperature in December
Shartlesville, PA
- Average high temperature in December: 40.1°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (33.6°F).
- Average low temperature in December: 28.6°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in December
Shartlesville, PA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Shartlesville, PA
- Average wind speed in December: 7.7mph
The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Shartlesville, PA
- Average humidity in December: 81%
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (76%).
Average rainfall in December
Shartlesville, PA
- Average rainfall in December: 2.01"
The wettest month (with the highest rainfall) is August (2.87").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days in December
Shartlesville, PA
- Average rainfall days in December: 10.8 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (7.7 days).
Average snowfall in December
Shartlesville, PA
- Average snowfall in December: 1.38"
The month with the highest snowfall is March (3.86").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Shartlesville, PA
- Average snowfall days in December: 4.5 days
The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Shartlesville, PA
- Average daylight in December: 9h and 2min
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 18min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days in December
Shartlesville, PA
- Average sunshine days in December: 16.8 days
The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is May (10.8 days).
Average UV index in December
Shartlesville, PA
- Average UV index in December: 2
The month with the highest UV index is June (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
Shartlesville, PA
- Average cloud cover in December: 51
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in December
Shartlesville, PA
- Average visibility in December: 5mi
The months with the highest visibility are January, March, April, June, July and November (6mi).
The months with the lowest visibility are February, May, August, September, October and December (5mi).
Shartlesville, Pennsylvania, USA
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