December weather forecastRoberts, IL
December
Weather in December
December, the first month of the winter in Roberts, is also a wintry month, with an average temperature fluctuating between 27.1°F (-2.7°C) and 37.2°F (2.9°C).Temperature
December's onset corresponds with a shift in the average high-temperature, moving from a chilly 48.2°F (9°C) in November to an icy 37.2°F (2.9°C). During December nights, Roberts witnesses a consistent average temperature of 27.1°F (-2.7°C).Humidity
The average relative humidity in December in Roberts is 80%.Rainfall
February and December are months with the least rain when the rain falls for 7.4 days and typically aggregates up to 1.14" (29mm) of rain.Snowfall
Months with snowfall are January through April, November and December. In Roberts, in December, snow falls for 6.3 days, with typically accumulated 1.54" (39mm) of snow. In Roberts, during the entire year, snow falls for 29.9 days and aggregates up to 9.09" (231mm) of snow.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year in Roberts.On the first day of the month, sunrise is at 6:57 am and sunset at 4:26 pm. On the last day of December, in Roberts, sunrise is at 7:16 am and sunset at 4:35 pm CST.
Sunshine
The average sunshine in December in Roberts is 4.3h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Roberts. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for average individuals.Note: In December, the maximum UV index of 2 translates into these guidelines:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Stay sun-safe with clothing that is both closely woven and worn loosely. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Roberts, IL
- Average high temperature in December: 37.2°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in December: 27.1°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in December
Roberts, IL
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Roberts, IL
- Average wind speed in December: 10.2mph
The windiest month (with the highest average wind speed) is January (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).
Average humidity in December
Roberts, IL
- Average humidity in December: 80%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Roberts, IL
- Average rainfall in December: 1.14"
The wettest month (with the highest rainfall) is May (2.91").
The driest months (with the least rainfall) are February and December (1.14").
Average rainfall days in December
Roberts, IL
- Average rainfall days in December: 7.4 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (5.8 days).
Average snowfall in December
Roberts, IL
- Average snowfall in December: 1.54"
The month with the highest snowfall is January (2.83").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Roberts, IL
- Average snowfall days in December: 6.3 days
The month with the highest number of snowfall days is January (10.4 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
Roberts, IL
- 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 18min
The month with the most sunshine is June (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Roberts, IL
- Average sunshine days in December: 18.3 days
The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is July (10.6 days).
Average UV index in December
Roberts, IL
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Roberts, IL
- Average cloud cover in December: 56
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 33).
Average visibility in December
Roberts, 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).
