December weather forecastRileyville, NJ
December
Weather in December
The first month of the winter, December, is also an icy month in Rileyville, New Jersey, with an average temperature fluctuating between 31.1°F (-0.5°C) and 42.4°F (5.8°C).Temperature
December comes with a decrease in the average high-temperature, falling from a cool 51.6°F (10.9°C) in November to a cold 42.4°F (5.8°C). Rileyville, in December, witnesses an average low-temperature of 31.1°F (-0.5°C).Humidity
In December, the average relative humidity is 78%.Rainfall
In Rileyville, in December, during 7.5 rainfall days, 0.98" (25mm) of precipitation is typically accumulated. In Rileyville, New Jersey, during the entire year, the rain falls for 107.3 days and collects up to 8.82" (224mm) of precipitation.Snowfall
January through May, November and December are months with snowfall in Rileyville. In Rileyville, in December, during 2.5 snowfall days, 0.43" (11mm) of snow is typically accumulated. Throughout the year, in Rileyville, New Jersey, there are 15.5 snowfall days, and 2.76" (70mm) of snow is accumulated.Daylight
The month with the shortest days in Rileyville is December, with an average of 9h and 18min of daylight.On the first day of December in Rileyville, New Jersey, sunrise is at 7:03 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:42 pm EST.
Sunshine
The average sunshine in December in Rileyville is 4.9h.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 value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for the average person.Note: In December, a daily UV index of 2 turns into the following recommendations:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Rileyville, NJ
- Average high temperature in December: 42.4°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 (36.5°F).
- Average low temperature in December: 31.1°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (23.5°F).
Average pressure in December
Rileyville, NJ
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Rileyville, NJ
- Average wind speed in December: 7.8mph
The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
Rileyville, NJ
- Average humidity in December: 78%
The months with the highest relative humidity are February and October (79%).
The month with the lowest relative humidity is April (74%).
Average rainfall in December
Rileyville, NJ
- Average rainfall in December: 0.98"
The wettest month (with the highest rainfall) is July (1.18").
The driest month (with the least rainfall) is September (0.35").
Average rainfall days in December
Rileyville, NJ
- Average rainfall days in December: 7.5 days
The month with the highest number of rainy days is July (12.9 days).
The month with the least rainy days is November (5.5 days).
Average snowfall in December
Rileyville, NJ
- Average snowfall in December: 0.43"
The month with the highest snowfall is March (0.75").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Rileyville, NJ
- Average snowfall days in December: 2.5 days
The month with the highest number of snowfall days is February (4.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Rileyville, NJ
- Average daylight in December: 9h and 18min
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 54min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in December
Rileyville, NJ
- Average sunshine days in December: 21.2 days
The month with the most sunshine days is November (22.7 days).
The month with the least sunshine days is July (13.6 days).
Average UV index in December
Rileyville, NJ
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (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
Rileyville, NJ
- Average cloud cover in December: 48
The months with the most cloud cover are February and December (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 33).
Average visibility in December
Rileyville, NJ
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
