December weather forecastRockford, IL
December
Weather in December
December in Rockford, the final month of the year, characteristically sees a decrease in temperatures, an increase in snowfall, and the shortest daylight hours. The high temperature drops to 32.4°F (0.2°C) and the low climbs down to 22.5°F (-5.3°C), setting the stage for the holiday season and the approach of a new year. The quiet charm of Rockford's winters is enjoyed as the city's landmarks, parks, and neighborhoods light up for the festive season. Despite colder temperatures and shorter days, December carries a special festive ambiance that more than makes up for the weather conditions.Temperature
Observing a mild shift, the average high-temperature in Rockford during December reduces from November's chilly 44.8°F (7.1°C) to a wintry 32.4°F (0.2°C). During December, Rockford experiences an average low-temperature of 22.5°F (-5.3°C) at night.Humidity
In Rockford, Illinois, the average relative humidity in December is 82%.Rainfall
In Rockford, in December, it is raining for 7.6 days, with typically 1.38" (35mm) of accumulated precipitation. In Rockford, during the entire year, the rain falls for 148.1 days and collects up to 28.39" (721mm) of precipitation.Snowfall
Months with snowfall in Rockford are January through April, October through December. In Rockford, in December, snow falls for 10.1 days, with typically accumulated 2.68" (68mm) of snow. Throughout the year, there are 45.9 snowfall days, and 15.67" (398mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 12min of daylight.On the first day of December, sunrise is at 7:06 am and sunset at 4:25 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:34 pm CST.
Sunshine
In December, the average sunshine in Rockford is 4h.UV index
January, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 1 during December translates into the following directions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Around midday, solar radiation is most harmful; hence, exposure should be limited. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Rockford, IL
- Average high temperature in December: 32.4°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (26.2°F).
- Average low temperature in December: 22.5°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (13.8°F).
Average pressure in December
Rockford, IL
- Average pressure in December: 30.09"Hg
The months with the highest atmospheric pressure are January and February (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Rockford, IL
- Average wind speed in December: 9.3mph
The windiest month (with the highest average wind speed) is April (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in December
Rockford, IL
- Average humidity in December: 82%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are April and October (75%).
Average rainfall in December
Rockford, IL
- Average rainfall in December: 1.38"
The wettest month (with the highest rainfall) is June (4.02").
The driest month (with the least rainfall) is February (1.26").
Average rainfall days in December
Rockford, IL
- Average rainfall days in December: 7.6 days
The month with the highest number of rainy days is May (19 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in December
Rockford, IL
- Average snowfall in December: 2.68"
The month with the highest snowfall is January (4.88").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Rockford, IL
- Average snowfall days in December: 10.1 days
The month with the highest number of snowfall days is January (13 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
Rockford, IL
- Average daylight in December: 9h and 12min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 0min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in December
Rockford, IL
- Average sunshine days in December: 16.1 days
The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is June (9.8 days).
Average UV index in December
Rockford, IL
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in December
Rockford, IL
- Average cloud cover in December: 59
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is September (Cloud cover 33).
Average visibility in December
Rockford, IL
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
