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
Riverside's weather changes with the onset of December, slightly falling from a chilly 48°F (8.9°C) in November to an icy 38.3°F (3.5°C). In December, the recorded average low-temperature is a freezing cold 27.7°F (-2.4°C).Humidity
In Riverside, Pennsylvania, the average relative humidity in December is 81%.Rainfall
In December, the rain falls for 10.3 days. Throughout December, 2.2" (56mm) of precipitation is accumulated. Throughout the year, there are 157.2 rainfall days, and 30.43" (773mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Riverside, during December, snow falls for 6.1 days and regularly aggregates up to 2.05" (52mm) of snow. Throughout the year, there are 33.2 snowfall days, and 16.57" (421mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 7:12 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 4:48 pm EST.
Sunshine
In December, the average sunshine is 4.2h.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 estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.Note: The maximum daily UV index of 2 during December translates into the following directions:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. During bright days, sunglasses that offer UVA and UVB defense are recommended. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in December?
What is the average humidity in December in Riverside?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Riverside have in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
When is the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Riverside, PA
- Average high temperature in December: 38.3°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (32°F).
- Average low temperature in December: 27.7°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 (19.8°F).
Average pressure in December
Riverside, 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
Riverside, PA
- Average wind speed in December: 7.3mph
The windiest months (with the highest average wind speed) are March and April (8mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in December
Riverside, PA
- Average humidity in December: 81%
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (76%).
Average rainfall in December
Riverside, PA
- Average rainfall in December: 2.2"
The wettest month (with the highest rainfall) is July (3.27").
The driest month (with the least rainfall) is January (2.05").
Average rainfall days in December
Riverside, PA
- Average rainfall days in December: 10.3 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in December
Riverside, PA
- Average snowfall in December: 2.05"
The month with the highest snowfall is February (4.8").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Riverside, PA
- Average snowfall days in December: 6.1 days
The month with the highest number of snowfall days is January (9.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Riverside, 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 1min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 0min).
Average sunshine days in December
Riverside, PA
- Average sunshine days in December: 16.5 days
The month with the most sunshine days is November (18.3 days).
The month with the least sunshine days is July (10.5 days).
Average UV index in December
Riverside, PA
- Average UV index in December: 2
The month with the highest UV index is June (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
Riverside, PA
- Average cloud cover in December: 56
The months with the most cloud cover are January, February and December (Cloud cover 56).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in December
Riverside, PA
- Average visibility in December: 6mi
The months with the highest visibility are March, April, November and December (6mi).
The months with the lowest visibility are January, February, May, June, July, August, September and October (5mi).
Riverside, Pennsylvania, USA
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