Skip to content
VSWeather

Chicago, IL vs Ontario, OR weather comparison

Chicago

IL

Ontario endures about 45 more days above 90 °F each year.

Chicago picks up around 23 more inches of snow each winter. Ontario sees rain or snow on roughly 67 fewer days each year.

The year at a glance

Averages from 30 years of climate history, 1991-2020

Annual weather statistics for Chicago, IL and Ontario, OR
ChicagoMetricOntario
180 daysSunny daysclear or partly cloudy skies234 days
39 inPrecipitationper year11 in
132 daysWet daysrain or snow per year65 days
37 inSnowfallper year14 in
16 daysHot daysabove 90 °F61 days
102 daysFreezing nightsat or below 32 °F129 days
71%Humidityaverage relative51%
52 °FAverage temperatureyear round53 °F

Monthly temperatures

Average daily high and low for each month, in °F. The gap between the two lines is what an ordinary day feels like across the year.

ChicagoOntario

Daily highs

406080JanMarMayJulSepNovChicago, Jan: 32 °FChicago, Feb: 36 °FChicago, Mar: 46 °FChicago, Apr: 57 °FChicago, May: 68 °FChicago, Jun: 78 °FChicago, Jul: 83 °FChicago, Aug: 81 °FChicago, Sep: 75 °FChicago, Oct: 62 °FChicago, Nov: 49 °FChicago, Dec: 37 °FOntario, Jan: 37 °FOntario, Feb: 45 °FOntario, Mar: 57 °FOntario, Apr: 64 °FOntario, May: 75 °FOntario, Jun: 83 °FOntario, Jul: 94 °FOntario, Aug: 92 °FOntario, Sep: 82 °FOntario, Oct: 65 °FOntario, Nov: 48 °FOntario, Dec: 37 °F

Daily lows

204060JanMarMayJulSepNovChicago, Jan: 20 °FChicago, Feb: 23 °FChicago, Mar: 31 °FChicago, Apr: 41 °FChicago, May: 51 °FChicago, Jun: 61 °FChicago, Jul: 67 °FChicago, Aug: 67 °FChicago, Sep: 60 °FChicago, Oct: 47 °FChicago, Nov: 36 °FChicago, Dec: 25 °FOntario, Jan: 23 °FOntario, Feb: 27 °FOntario, Mar: 33 °FOntario, Apr: 38 °FOntario, May: 47 °FOntario, Jun: 54 °FOntario, Jul: 61 °FOntario, Aug: 58 °FOntario, Sep: 48 °FOntario, Oct: 37 °FOntario, Nov: 28 °FOntario, Dec: 23 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Chicago high323646576878838175624937
Ontario high374557647583949282654837
Chicago low202331415161676760473625
Ontario low232733384754615848372823

Monthly precipitation

Total rain plus melted snow for each month, in inches. Taller bars mean wetter months.

ChicagoOntario
0.02.04.0JanMarMayJulSepNovChicago, Jan: 2.4 inChicago, Feb: 2.1 inChicago, Mar: 2.8 inChicago, Apr: 4.5 inChicago, May: 4.4 inChicago, Jun: 4.0 inChicago, Jul: 3.6 inChicago, Aug: 3.8 inChicago, Sep: 3.0 inChicago, Oct: 3.3 inChicago, Nov: 2.8 inChicago, Dec: 2.4 inOntario, Jan: 1.6 inOntario, Feb: 1.1 inOntario, Mar: 1.2 inOntario, Apr: 0.9 inOntario, May: 1.0 inOntario, Jun: 0.5 inOntario, Jul: 0.1 inOntario, Aug: 0.1 inOntario, Sep: 0.3 inOntario, Oct: 0.7 inOntario, Nov: 1.1 inOntario, Dec: 1.8 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Chicago2.42.12.84.54.44.03.63.83.03.32.82.4
Ontario1.61.11.20.91.00.50.10.10.30.71.11.8

Monthly sunny days

Days each month with clear or partly cloudy skies, so compare the same month between cities.

ChicagoOntario
0102030JanMarMayJulSepNovChicago, Jan: 10 daysChicago, Feb: 11 daysChicago, Mar: 14 daysChicago, Apr: 13 daysChicago, May: 15 daysChicago, Jun: 16 daysChicago, Jul: 20 daysChicago, Aug: 20 daysChicago, Sep: 20 daysChicago, Oct: 16 daysChicago, Nov: 14 daysChicago, Dec: 11 daysOntario, Jan: 12 daysOntario, Feb: 13 daysOntario, Mar: 15 daysOntario, Apr: 17 daysOntario, May: 20 daysOntario, Jun: 23 daysOntario, Jul: 29 daysOntario, Aug: 29 daysOntario, Sep: 26 daysOntario, Oct: 22 daysOntario, Nov: 15 daysOntario, Dec: 13 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Chicago101114131516202020161411
Ontario121315172023292926221513

Keep comparing

Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.

Chicago vs another city

See the full Chicago, IL climate profile

More Illinois cities

Ontario vs another city

See the full Ontario, OR climate profile

More Oregon cities

About this data

Every figure on this page is a 30 year average computed from daily climate history for 1991-2020, using each city's own coordinates. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.

Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).