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 slight reduction in average high-temperature, easing from a cool 50.4°F (10.2°C) in November to a cold 41.5°F (5.3°C). Throughout December, a steady low-temperature average of 29.8°F (-1.2°C) is noted.Humidity
In Shelly, the average relative humidity in December is 80%.Rainfall
In December, the rain falls for 10 days. Throughout December, 2.91" (74mm) of precipitation is accumulated. Throughout the year, in Shelly, there are 154.1 rainfall days, and 31.73" (806mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Shelly, in December, during 5 snowfall days, 2.87" (73mm) of snow is typically accumulated. In Shelly, Pennsylvania, during the entire year, snow falls for 29.3 days and aggregates up to 16.57" (421mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of December in Shelly, sunrise is at 7:06 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:44 pm EST.
Sunshine
In December, the average sunshine in Shelly is 4.8h.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 of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for average individuals.Note: The maximum UV index of 2 during December translates into these guidelines:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Frequently asked questions
Is December cold in Shelly?
What is the average humidity in December in Shelly?
How many days does it rain in December in Shelly?
How much does it snow in Shelly in December?
What is the month with the shortest days in Shelly?
How many hours of daylight does Shelly have in December?
When is the sunrise / sunset in December in Shelly?
How long on average sun shines in December in Shelly?
What are the months with the lowest UV index in Shelly?
What is the UV index reading in December in Shelly?
Average temperature in December
Shelly, PA
- Average high temperature in December: 41.5°F
The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (35.1°F).
- Average low temperature in December: 29.8°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (22.3°F).
Average pressure in December
Shelly, 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
Shelly, PA
- Average wind speed in December: 7.5mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in December
Shelly, PA
- Average humidity in December: 80%
The month with the highest relative humidity is February (81%).
The months with the lowest relative humidity are April and July (75%).
Average rainfall in December
Shelly, PA
- Average rainfall in December: 2.91"
The wettest months (with the highest rainfall) are May and July (3.07").
The driest month (with the least rainfall) is September (1.89").
Average rainfall days in December
Shelly, PA
- Average rainfall days in December: 10 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in December
Shelly, PA
- Average snowfall in December: 2.87"
The month with the highest snowfall is March (4.72").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Shelly, PA
- Average snowfall days in December: 5 days
The month with the highest number of snowfall days is February (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
Shelly, 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 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
Shelly, PA
- Average sunshine days in December: 17 days
The month with the most sunshine days is November (18 days).
The month with the least sunshine days is June (11.8 days).
Average UV index in December
Shelly, PA
- Average UV index in December: 2
The months with the highest UV index are May, June and July (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
Shelly, PA
- Average cloud cover in December: 50
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in December
Shelly, PA
- Average visibility in December: 5mi
The months with the highest visibility are March, April, June, July, August and November (6mi).
The months with the lowest visibility are January, February, May, September, October and December (5mi).
Shelly, Pennsylvania, USA
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