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 is characterized by a reduction in the average high-temperature, from a frosty 47.3°F (8.5°C) in November to an icy 37.9°F (3.3°C). December brings with it a nighttime average temperature of 27.5°F (-2.5°C) in East William Penn.Humidity
In East William Penn, the average relative humidity in December is 82%.Rainfall
In East William Penn, during December, the rain falls for 12.6 days and regularly aggregates up to 2.87" (73mm) of precipitation. Throughout the year, there are 171 rainfall days, and 34.25" (870mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall in East William Penn. In East William Penn, in December, snow falls for 8.6 days, with typically accumulated 3.9" (99mm) of snow. Throughout the year, there are 48.5 snowfall days, and 27.72" (704mm) of snow is accumulated.Daylight
December has the shortest days of the year in East William Penn, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:10 am and sunset at 4:37 pm. On the last day of December, sunrise is at 7:29 am and sunset at 4:47 pm EST.
Sunshine
In December, the average sunshine in East William Penn is 4.4h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.Note: A maximum high daily UV index of 2 during December translates into the following directions:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
Is December cold in East William Penn?
What is the average humidity in December in East William Penn?
How many days does it rain in December in East William Penn?
How many days does it snow in December in East William Penn?
What is the month with the shortest days in East William Penn?
How many hours of daylight does East William Penn have in December?
When are sunrise and sunset in December in East William Penn?
How long on average sun shines in December in East William Penn?
What is the month with the lowest UV index in East William Penn?
What is the UV index reading in December in East William Penn?
Average temperature in December
East William Penn, PA
- Average high temperature in December: 37.9°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.8°F).
- Average low temperature in December: 27.5°F
The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).
Average pressure in December
East William Penn, PA
- Average pressure in December: 30.1"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
East William Penn, 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
East William Penn, PA
- Average humidity in December: 82%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is April (77%).
Average rainfall in December
East William Penn, PA
- Average rainfall in December: 2.87"
The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is September (1.97").
Average rainfall days in December
East William Penn, PA
- Average rainfall days in December: 12.6 days
The month with the highest number of rainy days is May (19 days).
The month with the least rainy days is January (9.7 days).
Average snowfall in December
East William Penn, PA
- Average snowfall in December: 3.9"
The month with the highest snowfall is January (7.24").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
East William Penn, PA
- Average snowfall days in December: 8.6 days
The month with the highest number of snowfall days is January (12.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
East William Penn, 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: 4h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 18min).
Average sunshine days in December
East William Penn, PA
- Average sunshine days in December: 13.6 days
The month with the most sunshine days is November (15.8 days).
The month with the least sunshine days is May (9.1 days).
Average UV index in December
East William Penn, PA
- Average UV index in December: 2
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, February, March, November and December (UV index 2).
Average cloud cover in December
East William Penn, PA
- Average cloud cover in December: 54
The month with the most cloud cover is February (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in December
East William Penn, PA
- Average visibility in December: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
East William Penn, Pennsylvania, USA
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