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 signals a decrease in the average high-temperature, transitioning from a fresh 50°F (10°C) in November to a cold 38.7°F (3.7°C). In the month of December, the nighttime temperature in Riverton dips to a steady average of 28.2°F (-2.1°C).Humidity
In December, the average relative humidity in Riverton is 78%.Rainfall
The month with the least rainfall is December, when the rain falls for 6.6 days and typically collects 0.83" (21mm) of precipitation.Snowfall
January through April, November and December are months with snowfall in Riverton. In Riverton, in December, snow falls for 4.8 days, with typically accumulated 0.59" (15mm) of snow. In Riverton, during the entire year, snow falls for 24.5 days and aggregates up to 5.51" (140mm) of snow.Daylight
The month with the shortest days in Riverton is December, with an average of 9h and 24min of daylight.On the first day of December in Riverton, sunrise is at 7:01 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:43 pm CST.
Sunshine
In Riverton, the average sunshine in December is 4.7h.UV index
The months with the lowest UV index in Riverton are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, the UV index of 2 transforms into the following advice:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. To protect against the Sun's most potent rays, avoid direct exposure around midday. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Frequently asked questions
Is it cold in Riverton during December?
What is the average humidity in December in Riverton?
What is the driest month in Riverton?
How much does it rain in Riverton in December?
How many days does it snow in December in Riverton?
What is the month with the shortest days in Riverton?
What is the average length of the day in December in Riverton?
When is the sunrise / sunset in December in Riverton?
How long on average sun shines in December in Riverton?
When is the lowest UV index in Riverton?
How high is the UV index in December in Riverton?
Average temperature in December
Riverton, IL
- Average high temperature in December: 38.7°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (33.1°F).
- Average low temperature in December: 28.2°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).
Average pressure in December
Riverton, IL
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Riverton, IL
- Average wind speed in December: 9.8mph
The windiest months (with the highest average wind speed) are January and April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in December
Riverton, IL
- Average humidity in December: 78%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
Riverton, IL
- Average rainfall in December: 0.83"
The wettest month (with the highest rainfall) is June (2.36").
The driest month (with the least rainfall) is December (0.83").
Average rainfall days in December
Riverton, IL
- Average rainfall days in December: 6.6 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (5.7 days).
Average snowfall in December
Riverton, IL
- Average snowfall in December: 0.59"
The month with the highest snowfall is January (1.81").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Riverton, IL
- Average snowfall days in December: 4.8 days
The month with the highest number of snowfall days is January (8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Riverton, IL
- 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 24min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Riverton, IL
- Average sunshine days in December: 20.5 days
The month with the most sunshine days is December (20.5 days).
The month with the least sunshine days is May (11.5 days).
Average UV index in December
Riverton, IL
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Riverton, IL
- Average cloud cover in December: 51
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are June, August and September (Cloud cover 30).
Average visibility in December
Riverton, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Riverton, Illinois, USA
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