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
The start of December comes with a reduction in the average high-temperature, receding from a frosty 46.4°F (8°C) in November to a cold 36.5°F (2.5°C). During the nights in December, Twin Rocks experiences a consistent average temperature of 26.6°F (-3°C).Humidity
In December, the average relative humidity in Twin Rocks, Pennsylvania, is 85%.Rainfall
In Twin Rocks, in December, it is raining for 10.8 days, with typically 3.07" (78mm) of accumulated precipitation. In Twin Rocks, during the entire year, the rain falls for 169.1 days and collects up to 32.6" (828mm) of precipitation.Snowfall
Months with snowfall in Twin Rocks are January through May, October through December. In Twin Rocks, in December, snow falls for 12.4 days, with typically accumulated 6.38" (162mm) of snow. Throughout the year, in Twin Rocks, there are 65.6 snowfall days, and 33.54" (852mm) of snow is accumulated.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:20 am and sunset at 4:49 pm. On the last day of December, in Twin Rocks, Pennsylvania, sunrise is at 7:38 am and sunset at 4:58 pm EST.
Sunshine
The average sunshine in December in Twin Rocks, Pennsylvania, is 3.3h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The daily maximum UV index of 1 in December interprets into the following advice:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Frequently asked questions
How cold is it in Twin Rocks in December?
What is the average humidity in December in Twin Rocks?
How many days does it rain in December in Twin Rocks?
How much does it snow in Twin Rocks in December?
What is the month with the shortest days in Twin Rocks?
What is the average length of the day in December in Twin Rocks?
When is the sunrise / sunset in December in Twin Rocks?
How many hours of sunshine does Twin Rocks have in December?
When is the lowest UV index in Twin Rocks?
How high is the UV index in December in Twin Rocks?
Average temperature in December
Twin Rocks, PA
- Average high temperature in December: 36.5°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (30.6°F).
- Average low temperature in December: 26.6°F
The month with the highest average low temperature is July (59°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in December
Twin Rocks, 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
Twin Rocks, PA
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
Twin Rocks, PA
- Average humidity in December: 85%
The months with the highest relative humidity are January and February (86%).
The months with the lowest relative humidity are April and July (78%).
Average rainfall in December
Twin Rocks, PA
- Average rainfall in December: 3.07"
The wettest month (with the highest rainfall) is May (3.58").
The driest month (with the least rainfall) is November (1.85").
Average rainfall days in December
Twin Rocks, PA
- Average rainfall days in December: 10.8 days
The month with the highest number of rainy days is May (20.7 days).
The month with the least rainy days is February (9.3 days).
Average snowfall in December
Twin Rocks, PA
- Average snowfall in December: 6.38"
The month with the highest snowfall is January (8.27").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Twin Rocks, PA
- Average snowfall days in December: 12.4 days
The month with the highest number of snowfall days is January (17.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Twin Rocks, 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: 3h and 2min
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 54min).
Average sunshine days in December
Twin Rocks, PA
- Average sunshine days in December: 9.8 days
The month with the most sunshine days is November (14.8 days).
The month with the least sunshine days is January (7.5 days).
Average UV index in December
Twin Rocks, 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
Twin Rocks, PA
- Average cloud cover in December: 68
The month with the most cloud cover is January (Cloud cover 72).
The months with the least cloud cover are July and August (Cloud cover 39).
Average visibility in December
Twin Rocks, PA
- Average visibility in December: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January and February (4mi).
Twin Rocks, Pennsylvania, USA
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