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
A shift in Shirleysburg's weather is observed as November turns into December, with the average high temperature reducing from a frosty 48.4°F (9.1°C) to a wintry 38.8°F (3.8°C). Shirleysburg's average low-temperature in the month of December is recorded at a subzero cold 27.5°F (-2.5°C).Humidity
In Shirleysburg, the average relative humidity in December is 81%.Rainfall
In Shirleysburg, in December, it is raining for 10.9 days, with typically 2.36" (60mm) of accumulated precipitation. Throughout the year, there are 164.3 rainfall days, and 28.19" (716mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall in Shirleysburg. In Shirleysburg, in December, during 7.7 snowfall days, 2.56" (65mm) of snow is typically accumulated. Throughout the year, there are 40.6 snowfall days, and 17.91" (455mm) of snow is accumulated.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year in Shirleysburg.On the first day of the month, sunrise is at 7:15 am and sunset at 4:45 pm. On the last day of December, in Shirleysburg, sunrise is at 7:34 am and sunset at 4:55 pm EST.
Sunshine
The average sunshine in December in Shirleysburg is 4.3h.UV index
January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Shirleysburg. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, a daily maximum UV index of 2 leads to the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Frequently asked questions
How cold is December in Shirleysburg?
What is the average humidity in December in Shirleysburg?
How many days does it rain in December in Shirleysburg?
How many days does it snow in December in Shirleysburg?
What is the month with the shortest days in Shirleysburg?
How many hours of daylight does Shirleysburg have in December?
What time are sunrise and sunset in December in Shirleysburg?
How long on average sun shines in December in Shirleysburg?
What is the month with the lowest UV index in Shirleysburg?
How high is the UV index in December in Shirleysburg?
Average temperature in December
Shirleysburg, PA
- Average high temperature in December: 38.8°F
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (32.9°F).
- Average low temperature in December: 27.5°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).
Average pressure in December
Shirleysburg, PA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
Shirleysburg, PA
- Average wind speed in December: 7.1mph
The windiest month (with the highest average wind speed) is January (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity in December
Shirleysburg, PA
- Average humidity in December: 81%
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is July (75%).
Average rainfall in December
Shirleysburg, PA
- Average rainfall in December: 2.36"
The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is September (1.85").
Average rainfall days in December
Shirleysburg, PA
- Average rainfall days in December: 10.9 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (9.5 days).
Average snowfall in December
Shirleysburg, PA
- Average snowfall in December: 2.56"
The month with the highest snowfall is January (5.24").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Shirleysburg, PA
- Average snowfall days in December: 7.7 days
The month with the highest number of snowfall days is January (12.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Shirleysburg, 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 2min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in December
Shirleysburg, PA
- Average sunshine days in December: 14.2 days
The month with the most sunshine days is November (16.7 days).
The month with the least sunshine days is May (10.7 days).
Average UV index in December
Shirleysburg, PA
- Average UV index in December: 2
The months with the highest UV index are May and June (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in December
Shirleysburg, PA
- Average cloud cover in December: 55
The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are July and August (Cloud cover 34).
Average visibility in December
Shirleysburg, 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).
Shirleysburg, Pennsylvania, USA
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