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's arrival corresponds with a decrease in average high-temperatures, from November's frosty 48°F (8.9°C) to an icy 38.3°F (3.5°C). In Riverside, the nighttime temperature averages to a subzero cold 27.7°F (-2.4°C) during December.Humidity
In December, the average relative humidity is 81%.Rainfall
In Riverside, in December, it is raining for 10.3 days, with typically 2.2" (56mm) of accumulated precipitation. In Riverside, during the entire year, the rain falls for 157.2 days and collects up to 30.43" (773mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Riverside, in December, snow falls for 6.1 days, with typically accumulated 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 in Riverside, 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 Riverside, the average sunshine in December 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 in Riverside. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: During December, 2 as the daily maximum UV index converts into the following advice:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Frequently asked questions
Is December cold in Riverside?
What is the average humidity in December in Riverside?
How many days does it rain in December in Riverside?
How many days does it snow in December in Riverside?
What is the month with the shortest days in Riverside?
What is the average length of the day in December in Riverside?
What time are sunrise and sunset in December in Riverside?
How many hours of sunshine does Riverside have in December?
What is the month with the lowest UV index in Riverside?
What is the UV index intensity in December in Riverside?
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
Weather forecast for your location
2. Allow the app to use your location
