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Chicago, IL vs Petaluma, CA weather comparison

Chicago

IL

Chicago picks up around 37 more inches of snow each winter.

Petaluma has around 81 fewer freezing nights a year. Petaluma sees rain or snow on roughly 73 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 Petaluma, CA
ChicagoMetricPetaluma
180 daysSunny daysclear or partly cloudy skies254 days
39 inPrecipitationper year28 in
132 daysWet daysrain or snow per year59 days
37 inSnowfallper year0 in
16 daysHot daysabove 90 °F21 days
102 daysFreezing nightsat or below 32 °F20 days
71%Humidityaverage relative73%
52 °FAverage temperatureyear round58 °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.

ChicagoPetaluma

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 °FPetaluma, Jan: 58 °FPetaluma, Feb: 61 °FPetaluma, Mar: 65 °FPetaluma, Apr: 68 °FPetaluma, May: 72 °FPetaluma, Jun: 78 °FPetaluma, Jul: 81 °FPetaluma, Aug: 81 °FPetaluma, Sep: 82 °FPetaluma, Oct: 76 °FPetaluma, Nov: 65 °FPetaluma, Dec: 58 °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 °FPetaluma, Jan: 39 °FPetaluma, Feb: 40 °FPetaluma, Mar: 42 °FPetaluma, Apr: 44 °FPetaluma, May: 47 °FPetaluma, Jun: 50 °FPetaluma, Jul: 52 °FPetaluma, Aug: 53 °FPetaluma, Sep: 51 °FPetaluma, Oct: 48 °FPetaluma, Nov: 42 °FPetaluma, Dec: 38 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Chicago high323646576878838175624937
Petaluma high586165687278818182766558
Chicago low202331415161676760473625
Petaluma low394042444750525351484238

Monthly precipitation

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

ChicagoPetaluma
0.02.04.06.0JanMarMayJulSepNovChicago, 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 inPetaluma, Jan: 5.4 inPetaluma, Feb: 5.7 inPetaluma, Mar: 4.2 inPetaluma, Apr: 1.9 inPetaluma, May: 1.0 inPetaluma, Jun: 0.2 inPetaluma, Jul: 0.0 inPetaluma, Aug: 0.0 inPetaluma, Sep: 0.1 inPetaluma, Oct: 1.2 inPetaluma, Nov: 2.8 inPetaluma, Dec: 5.5 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Chicago2.42.12.84.54.44.03.63.83.03.32.82.4
Petaluma5.45.74.21.91.00.20.00.00.11.22.85.5

Monthly sunny days

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

ChicagoPetaluma
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 daysPetaluma, Jan: 13 daysPetaluma, Feb: 13 daysPetaluma, Mar: 16 daysPetaluma, Apr: 20 daysPetaluma, May: 23 daysPetaluma, Jun: 26 daysPetaluma, Jul: 29 daysPetaluma, Aug: 29 daysPetaluma, Sep: 28 daysPetaluma, Oct: 24 daysPetaluma, Nov: 18 daysPetaluma, Dec: 15 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Chicago101114131516202020161411
Petaluma131316202326292928241815

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

Petaluma vs another city

See the full Petaluma, CA climate profile

More California 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).