Overview & Graphics

Meteorological Fall 2021 featured overall well above normal temperatures due to the exceptional warmth of September and October, with a cooler end to the season as November had near to slightly below normal temperatures. It was also a dry autumn, with most of the precipitation falling during a wetter than normal October. 

Fall Climate Summary

November Climate Summary

...A Look Back at the Climate for Meteorological Fall (September,
October, November) 2021 for Chicago and Rockford...

At Chicago, the average high temperature for the fall season was
64.9 degrees, which is 2.7 degrees above the 1991 to 2020
average. The average low temperature was 48.6 degrees, which is
3.1 degrees above normal. The mean temperature for the season was
56.8 degrees, which is 2.9 degrees above normal. A total of 7.71
inches of precipitation were recorded during the season, which is
1.33 inches below normal.

Records established or tied during the fall months:

The fall season of 2021 ranks as tied with 1927 and 1914 for the
8th warmest on record dating back to 1872.

September: Tied with 1925 for the 5th warmest September on record
since 1871.

October: Tied 9th warmest October on record since 1872.
* Record daily warmest minimum temperature of 70 degrees on the
 10th.
* Record daily precipitation of 1.85 inches on the 24th.

November: 8th driest November on record since 1872 with 0.71
inches of precipitation.


At Rockford, the average high temperature was 66.2 degrees, which
is 4.6 degrees above normal. The average low temperature was 44.1
degrees, which is 2.1 degrees above normal. The mean temperature
for the season was 55.1 degrees, which is 3.3 degrees above
normal. A total of 6.27 inches of precipitation was recorded
this past fall, which is 2.25 inches below normal.

Records established or tied during the fall months:

The fall season of 2021 ranks as the 8th warmest on record dating
back to 1905.

September: 9th warmest and 7th driest September on record since
1905.
* Tied record daily warmest maximum temperature of 93 degrees on
  the 19th.
* Record daily maximum temperature of 90 degrees on the 27th.

October: 6th warmest October on record since 1905 with 57.9
degrees.
* Record daily warmest minimum temperature of 67 degrees on the
  2nd.
* Tied record daily warmest minimum temperature of 67 degrees on
  the 10th.

November: Tied 2nd driest November on record since 1905 with 0.38
inches of precipitation.

$$

KJB

Latest Seasonal Climate Report:   Chicago    |    Rockford

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

At Chicago, the average high temperature was 48.2 degrees, which
is 0.2 degrees below normal. The average low temperature was 32.5
degrees, which is 1.6 degrees below normal. The average
temperature for the month was 40.3 degrees, which is 1.0 degrees
below normal. During the month of November, 0.71 inches of
precipitation were recorded, which is 1.71 inches below normal.
A Trace of snow was recorded, which is 1.8 inches below normal.

No daily weather records were set for Chicago during the month of
November 2021:

One Top Ten Monthly Record:
**8th driest November on record since 1872 with 0.71 inches of
 precipitation.

At Rockford, the average high temperature was 48.9 degrees, which
is 1.8 degrees above normal. The average low temperature was 28.4
degrees, which is 2.1 degrees below normal. The average
temperature for the month was 38.6 degrees, which is 0.2 degrees
below normal. During the month of November, 0.38 inches of
precipitation were recorded, which is 1.89 inches below normal.
0.2 inches of snow were recorded, which is 2.1 inches below
normal.

No daily weather records were set for Rockford during the month
of November 2021:

One Top Ten Monthly Record:
**Tied 2nd driest November on record since 1905 with 0.38 inches of
precipitation.

$$

KJB

Latest Monthly Climate Report:   Chicago    |    Rockford

Events

• October 24-25, 2021: Widespread heavy rain and strong winds, as well as lakeshore flooding
• September 7, 2021: Swaths of large hail and wind damage across northern IL

​NWS Chicago Science and Past Events Page