Weather on December 21

Chicago, IL

55 Years of Data

Avg High
35°F
Avg Low
23°F
Warmest
2015
47°F avg
Coldest
1989
-2°F avg

About This Date

December 21st in Chicago, IL typically brings cold winter weather, with average highs around 35°F and lows near 23°F. Over 55 years of records, the warmest December 21st was in 2015 (47°F average), while the coldest was 1989 (-2°F) — a 49°F range across recorded history. Precipitation has occurred on 15% of recorded December 21st dates, with snow falling 9% of the time (heaviest snowfall: 2.5"). The last decade has been 8.5°F warmer on this date compared to 20-30 years ago.

The last decade has been 8.5°F warmer on this date compared to 20-30 years ago.

Planning for December 21st in Chicago, IL? Bundle up with warm layers and protect extremities from the cold.

Warming Trend
1.6°F per decade on this date
YearHighLowAvgPrecipSnow
202534°20°27°
202427°21°24°
202342°35°39°
202233°18°25°
202141°28°35°
202046°34°40°
201949°34°41°
201839°30°35°
201738°33°35°
201638°22°30°
2015warmest54°41°47°
201437°32°35°
201334°31°32°
201235°22°28°
201144°40°42°
201034°29°31°
200931°29°30°
200823°-3°10°
200739°34°36°
200644°38°41°
200525°13°19°
200434°15°24°
200347°26°36°
200235°29°32°
200142°25°33°
200020°-4°1.7"
199917°10°
199835°12°24°0.03"
199737°30°34°
199637°16°26°
199532°21°27°
199451°31°41°
199335°27°31°
199231°17°24°
199138°30°34°0.56"0.2"
199048°43°45°0.58"
1989coldest-13°-2°0.13"0.4"
198858°31°44°
198739°27°33°
198638°34°36°
198523°13°
198444°29°36°1.02"
198326°18°22°0.43"2.5"
198232°22°27°
198133°15°24°0.89"2"
198023°16°
197942°33°38°
197835°16°25°
197731°19°25°1.14"
197623°14°
197530°26°28°
197433°23°28°
197328°10°19°
197237°33°35°
197134°28°31°
55 years of data from CHICAGO GRANT PARK

Browse Weather History

Weather data provided by NOAA Climate Data Online. Not for critical planning.

December 21st Weather in Chicago, IL - 55 Years of History