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
In Summerville, the average high-temperature in December decreases from a chilly 45.7°F (7.6°C) in November to a cold 36.5°F (2.5°C). Summerville encounters a steady low-temperature average of 25.5°F (-3.6°C) throughout the month of December.Humidity
In December, the average relative humidity in Summerville is 86%.Rainfall
In Summerville, in December, during 10.2 rainfall days, 1.61" (41mm) of precipitation is typically accumulated. Throughout the year, in Summerville, there are 150.5 rainfall days, and 22.05" (560mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall in Summerville. In Summerville, in December, during 13.5 snowfall days, 3.74" (95mm) of snow is typically accumulated. Throughout the year, there are 72.4 snowfall days, and 22.28" (566mm) of snow is accumulated.Daylight
The month with the shortest days in Summerville is December, with an average of 9h and 18min of daylight.On the first day of December in Summerville, sunrise is at 7:23 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 4:58 pm EST.
Sunshine
The average sunshine in December in Summerville is 2.7h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: A maximum UV index of 1 in December translates into the following recommendations:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Frequently asked questions
How cold is December in Summerville?
What is the average humidity in December in Summerville?
How many days does it rain in December in Summerville?
How many days does it snow in December in Summerville?
What is the month with the shortest days in Summerville?
How many hours of daylight does Summerville have in December?
When are sunrise and sunset in December in Summerville?
How long on average sun shines in December in Summerville?
What is the month with the lowest UV index in Summerville?
What is the UV index intensity in December in Summerville?
Average temperature in December
Summerville, PA
- Average high temperature in December: 36.5°F
The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (30.2°F).
- Average low temperature in December: 25.5°F
The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).
Average pressure in December
Summerville, PA
- Average pressure in December: 30.1"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
Summerville, PA
- Average wind speed in December: 8.3mph
The windiest month (with the highest average wind speed) is January (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in December
Summerville, PA
- Average humidity in December: 86%
The month with the highest relative humidity is February (88%).
The months with the lowest relative humidity are June, July and August (78%).
Average rainfall in December
Summerville, PA
- Average rainfall in December: 1.61"
The wettest month (with the highest rainfall) is April (2.56").
The driest month (with the least rainfall) is November (1.26").
Average rainfall days in December
Summerville, PA
- Average rainfall days in December: 10.2 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (7.2 days).
Average snowfall in December
Summerville, PA
- Average snowfall in December: 3.74"
The month with the highest snowfall is February (5.51").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Summerville, PA
- Average snowfall days in December: 13.5 days
The month with the highest number of snowfall days is January (18 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Summerville, PA
- Average daylight in December: 9h and 2min
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 18min).
- Average sunshine in December: 2h and 4min
The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 2h and 30min).
Average sunshine days in December
Summerville, PA
- Average sunshine days in December: 11.4 days
The month with the most sunshine days is November (15.3 days).
The month with the least sunshine days is February (8.1 days).
Average UV index in December
Summerville, PA
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Summerville, PA
- Average cloud cover in December: 72
The month with the most cloud cover is January (Cloud cover 76).
The months with the least cloud cover are July and August (Cloud cover 39).
Average visibility in December
Summerville, PA
- Average visibility in December: 5mi
The month with the highest visibility is April (6mi).
The month with the lowest visibility is February (4mi).
Summerville, Pennsylvania, USA
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