December weather forecastPetersburg, IL
December
Weather in December
The first month of the winter, December, is also an icy month in Petersburg, Illinois, with an average temperature ranging between max 38.5°F (3.6°C) and min 27.5°F (-2.5°C).Temperature
With December's arrival, Petersburg, Illinois, sees a decrease in average high-temperatures, moving from a fresh 50°F (10°C) in November to a wintry 38.5°F (3.6°C). Throughout the month of December, the nighttime temperature dips to an average of 27.5°F (-2.5°C).Humidity
The average relative humidity in December in Petersburg is 78%.Rainfall
The month with the least rainfall in Petersburg, Illinois, is December, when the rain falls for 8.1 days and typically collects 1.5" (38mm) of precipitation.Snowfall
January through April, October through December are months with snowfall in Petersburg. In Petersburg, in December, snow falls for 4.8 days, with typically accumulated 1.46" (37mm) of snow. In Petersburg, during the entire year, snow falls for 29.2 days and aggregates up to 10.39" (264mm) of snow.Daylight
The month with the shortest days in Petersburg, Illinois, is December, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:02 am and sunset at 4:34 pm. On the last day of December, in Petersburg, sunrise is at 7:21 am and sunset at 4:44 pm CST.
Sunshine
In Petersburg, the average sunshine in December is 4.5h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: An average UV index of 2 in December transforms into this advice:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Petersburg, IL
- Average high temperature in December: 38.5°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 (32.9°F).
- Average low temperature in December: 27.5°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).
Average pressure in December
Petersburg, 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
Petersburg, IL
- Average wind speed in December: 9.7mph
The windiest months (with the highest average wind speed) are January, February and April (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in December
Petersburg, 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
Petersburg, IL
- Average rainfall in December: 1.5"
The wettest month (with the highest rainfall) is May (3.82").
The driest month (with the least rainfall) is December (1.5").
Average rainfall days in December
Petersburg, IL
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (6.2 days).
Average snowfall in December
Petersburg, IL
- Average snowfall in December: 1.46"
The month with the highest snowfall is January (4.02").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Petersburg, IL
- Average snowfall days in December: 4.8 days
The month with the highest number of snowfall days is January (10.3 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
Petersburg, IL
- Average daylight in December: 9h and 24min
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 30min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Petersburg, IL
- Average sunshine days in December: 18.1 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (11.3 days).
Average UV index in December
Petersburg, 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
Petersburg, IL
- Average cloud cover in December: 52
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Petersburg, 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).
