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 onset of December comes with a shift in the average high-temperature, falling from a chilly 46.2°F (7.9°C) in November to a wintry 36.7°F (2.6°C). During December, the average low-temperature is a subzero cold 25.7°F (-3.5°C).Humidity
The average relative humidity in December in Rossiter is 86%.Rainfall
In Rossiter, in December, it is raining for 10.5 days, with typically 1.73" (44mm) of accumulated precipitation. Throughout the year, there are 151.9 rainfall days, and 22.13" (562mm) of precipitation is accumulated.Snowfall
Months with snowfall in Rossiter are January through May, October through December. In Rossiter, during December, snow falls for 14.6 days and regularly aggregates up to 4.21" (107mm) of snow. Throughout the year, in Rossiter, there are 71 snowfall days, and 22.32" (567mm) 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 December in Rossiter, sunrise is at 7:21 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 4:57 pm EST.
Sunshine
The average sunshine in December in Rossiter is 2.6h.UV index
The month with the lowest UV index in Rossiter is December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for the ordinary person.Note: The daily high UV index of 1 in December translates into this advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Frequently asked questions
How cold is December in Rossiter?
What is the average humidity in December in Rossiter?
How much does it rain in Rossiter in December?
How many days does it snow in December in Rossiter?
What is the month with the shortest days in Rossiter?
How many hours of daylight does Rossiter have in December?
What time are sunrise and sunset in December in Rossiter?
How long on average sun shines in December in Rossiter?
When is the lowest UV index in Rossiter?
How high is the UV index in December in Rossiter?
Average temperature in December
Rossiter, PA
- Average high temperature in December: 36.7°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (30.4°F).
- Average low temperature in December: 25.7°F
The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure in December
Rossiter, 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 (29.95"Hg).
Average wind speed in December
Rossiter, PA
- Average wind speed in December: 8.6mph
The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in December
Rossiter, PA
- Average humidity in December: 86%
The month with the highest relative humidity is February (88%).
The months with the lowest relative humidity are June, July and August (78%).
Average rainfall in December
Rossiter, PA
- Average rainfall in December: 1.73"
The wettest month (with the highest rainfall) is April (2.48").
The driest month (with the least rainfall) is November (1.26").
Average rainfall days in December
Rossiter, PA
- Average rainfall days in December: 10.5 days
The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is January (7.8 days).
Average snowfall in December
Rossiter, PA
- Average snowfall in December: 4.21"
The month with the highest snowfall is January (5.63").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Rossiter, PA
- Average snowfall days in December: 14.6 days
The month with the highest number of snowfall days is January (18.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Rossiter, 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: 2h and 4min
The months with the most sunshine are July and August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 2h and 30min).
Average sunshine days in December
Rossiter, PA
- Average sunshine days in December: 9.2 days
The month with the most sunshine days is September (15.3 days).
The month with the least sunshine days is February (7.8 days).
Average UV index in December
Rossiter, 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
Rossiter, PA
- Average cloud cover in December: 72
The month with the most cloud cover is January (Cloud cover 75).
The month with the least cloud cover is August (Cloud cover 39).
Average visibility in December
Rossiter, 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).
Rossiter, Pennsylvania, USA
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