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 brings a drop in Berwyn's average high-temperature, falling from a fresh 51.8°F (11°C) in November to an icy 42.6°F (5.9°C). During December, the temperature in Berwyn is averaged to a low of 31.1°F (-0.5°C) at night.Humidity
In Berwyn, the average relative humidity in December is 78%.Rainfall
In Berwyn, in December, during 9.1 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. In Berwyn, during the entire year, the rain falls for 138.1 days and collects up to 20.79" (528mm) of precipitation.Snowfall
Months with snowfall in Berwyn are January through May, October through December. In Berwyn, in December, snow falls for 2.5 days, with typically accumulated 1.46" (37mm) of snow. Throughout the year, there are 19.3 snowfall days, and 7.68" (195mm) of snow is accumulated.Daylight
December has the shortest days of the year in Berwyn, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:05 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:46 pm EST.
Sunshine
In December, the average sunshine is 4.8h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: A daily maximum UV index of 2 in December translates into the following instructions:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Frequently asked questions
How cold is December in Berwyn?
What is the average humidity in December in Berwyn?
How much does it rain in Berwyn in December?
How much does it snow in Berwyn in December?
What is the month with the shortest days in Berwyn?
How many hours of daylight does Berwyn have in December?
When is the sunrise / sunset in December in Berwyn?
How long on average sun shines in December in Berwyn?
What is the month with the lowest UV index in Berwyn?
What is the UV index intensity in December in Berwyn?
Average temperature in December
Berwyn, PA
- Average high temperature in December: 42.6°F
The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (36.5°F).
- Average low temperature in December: 31.1°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in December
Berwyn, 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
Berwyn, PA
- Average wind speed in December: 7.8mph
The windiest month (with the highest average wind speed) is March (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
Berwyn, PA
- Average humidity in December: 78%
The months with the highest relative humidity are February and October (79%).
The months with the lowest relative humidity are April, July and August (73%).
Average rainfall in December
Berwyn, PA
- Average rainfall in December: 1.81"
The wettest month (with the highest rainfall) is August (2.72").
The driest months (with the least rainfall) are January, February and November (1.3").
Average rainfall days in December
Berwyn, PA
- Average rainfall days in December: 9.1 days
The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is January (6.3 days).
Average snowfall in December
Berwyn, PA
- Average snowfall in December: 1.46"
The month with the highest snowfall is March (1.93").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Berwyn, PA
- Average snowfall days in December: 2.5 days
The month with the highest number of snowfall days is January (6.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Berwyn, 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 24min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in December
Berwyn, PA
- Average sunshine days in December: 19.2 days
The month with the most sunshine days is November (20.1 days).
The month with the least sunshine days is July (12.7 days).
Average UV index in December
Berwyn, PA
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (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
Berwyn, PA
- Average cloud cover in December: 49
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in December
Berwyn, PA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Berwyn, Pennsylvania, USA
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