Climateby Month

Chicago vs Aurora weather

Chicago, IL and Aurora, IL · 35 mi apart

July highs: 85°F in Chicago, 84°F in Aurora (Chicago is 1°F warmer). January highs: 33°F and 31°F (Chicago is 2°F warmer). Chicago has about 127 wet days a year, Aurora about 116. Muggy days: about 34 a year in Chicago, about 32 in Aurora. Snow: 38.8 in a year in Chicago, 27.9 in in Aurora.

Chicago, IL

0°20°40°60°80°100° January: normal high 33°F (1°C), low 20°F (-7°C) 33° 20° February: normal high 37°F (3°C), low 23°F (-5°C) March: normal high 48°F (9°C), low 32°F (0°C) April: normal high 60°F (16°C), low 42°F (6°C) May: normal high 72°F (22°C), low 52°F (11°C) June: normal high 81°F (27°C), low 63°F (17°C) July: normal high 85°F (29°C), low 68°F (20°C) 85° 68° August: normal high 83°F (28°C), low 67°F (19°C) September: normal high 77°F (25°C), low 59°F (15°C) October: normal high 64°F (18°C), low 47°F (8°C) November: normal high 50°F (10°C), low 35°F (2°C) December: normal high 38°F (3°C), low 25°F (-4°C) JFMAMJJASOND

Best months: May, September

Aurora, IL

0°20°40°60°80°100° January: normal high 31°F (-1°C), low 16°F (-9°C) 31° 16° February: normal high 35°F (2°C), low 20°F (-7°C) March: normal high 47°F (8°C), low 29°F (-2°C) April: normal high 60°F (16°C), low 39°F (4°C) May: normal high 71°F (22°C), low 50°F (10°C) June: normal high 81°F (27°C), low 60°F (16°C) July: normal high 84°F (29°C), low 65°F (18°C) 84° 65° August: normal high 82°F (28°C), low 63°F (17°C) September: normal high 76°F (24°C), low 55°F (13°C) October: normal high 63°F (17°C), low 43°F (6°C) November: normal high 48°F (9°C), low 32°F (0°C) December: normal high 36°F (2°C), low 22°F (-6°C) JFMAMJJASOND

Best months: May

Which city for what

  • Fewer wet days: Aurora (116 a year vs 127 a year)
  • Less snow: Aurora (27.9 in vs 38.8 in)
  • Longer growing season: Chicago (201 frost-free days vs 185 frost-free days)

Listed only where the difference is at least 3°F in highs, 10 days a year or 3 in of snow.

Season by season

SeasonAvg high ChicagoAvg high AuroraWet days ChicagoWet days Aurora
Winter (Dec-Feb)36°F34°F3226
Spring (Mar-May)60°F59°F3634
Summer (Jun-Aug)83°F82°F3029
Fall (Sep-Nov)63°F62°F2926

Side by side over a year

ChicagoAurora
Hot days (90°F+)2116
Freezing nights108134
Muggy days3432
Comfortable days7880
Precipitation40.9 in39.5 in
Snowfall38.8 in27.9 in
Frost dateslast Apr 11, first Oct 31last Apr 19, first Oct 23
Daylight in June / December15.2 h / 9.2 h15.2 h / 9.2 h
Best monthsMay, SeptemberMay

Day counts from each city's daily records, 1991-2020. Comfortable days: highs 65-80°F and dew point under 60°F.

Month by month

MonthHigh ChicagoHigh AuroraWet days ChicagoWet days Aurora
January33°F31°F129
February37°F35°F98
March48°F47°F1110
April60°F60°F1212
May72°F71°F1213
June81°F81°F1111
July85°F84°F109
August83°F82°F99
September77°F76°F88
October64°F63°F119
November50°F48°F109
December38°F36°F119

Both charts use the same temperature scale.

Where the numbers come from

  • Chicago, IL: temperature from Chicago Midway Airport 3SW (USC00111577), 10 mi SW of the city center; precipitation from Chicago Midway Airport 3SW (USC00111577). NOAA 1991-2020 normals and daily records.
  • Aurora, IL: temperature from Aurora (USC00110338), 1.5 mi NNE of the city center; precipitation from Aurora (USC00110338). NOAA 1991-2020 normals and daily records.

Every station for each city, including humidity and frost, is listed on the city page. Methodology.