December 2021 Climate Summary

Overview & Graphics
Monthly Summary
Events

Overview & Graphics

Chicago and Rockford Monthly Summary

Public Information Statement
National Weather Service Chicago IL
1203 PM CST Sat Jan 1 2022 /103 PM EST Sat Jan 1 2022/

...A Look Back at the Climate for the Month of December 2021 for
Chicago and Rockford...


At Chicago, the average high temperature was 45.8 degrees, which
is 9.2 degrees above normal. The average low temperature was 30.2
degrees, which is 5.8 degrees above normal. The average temperature
for the month was 38.0 degrees, which is 7.5 degrees above normal.
During the month of December, 2.30 inches of precipitation were
recorded, which is 0.19 inches above normal. 1.9 inches of snow
fell, which is 5.7 inches below normal.

Three daily records for Chicago were set during the month of
December 2021:
* Record daily maximum temperature of 66 degrees on the 15th.
* Record daily highest minimum temperature of 50 degrees on the 15th.
* Record daily maximum temperature of 66 degrees on the 16th.

One top ten monthly record:
** 6th warmest December on record since 1871 with a mean average
   temperature of 38.0 degrees.


At Rockford, the average high temperature was 44.2 degrees, which
is 9.9 degrees above normal. The average low temperature was 25.7
degrees, which is 5.5 degrees above normal. The average temperature
for the month was 34.9 degrees, which is 7.6 degrees above normal.
During the month of December, 2.42 inches of precipitation were
recorded, which is 0.49 inches above normal. 2.6 inches of snow
fell, which is 6.8 inches below normal.

Four daily records for Rockford were set during the month of
December 2021:
* Record daily maximum temperature of 69 degrees on the 15th.
* Record daily highest minimum temperature of 50 degrees on the 15th.
* Record daily maximum temperature of 68 degrees on the 16th.
* Tied record daily maximum temperature of 55 degrees on the 24th.

One top ten monthly record:
** 4th warmest December on record since 1905 with a mean average
   temperature of 34.9 degrees.

$$

Ogorek

Monthly Climate Report: Chicago | Rockford

Events

December 28, 2021: First accumulating snow of the season; latest first on record for Chicago

December 15-16, 2021: Strong, damaging winds accompanied by record warmth

December 10, 2021: Scattered severe winds and EF-0 tornado in Lake County, IN

NWS Chicago Science and Past Events Page