Best year time to visit Cook County

General weather information about Cook County

Average annual temperature is 11.0 °C

Absolute maximum temperature: 37.0 °C

Absolute minimum temperature: -19.4 °C

Number of sunny days: 179 days

Number of rainy days: 173 days

Number of snow days: 13 days

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* Weather data for Cook County United States is based on climate observations for 2026 year

Cook County air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)12.714.720.426.730.230.732.237.034.627.819.713.3
Average daytime temperature (°C)3.35.66.916.019.124.626.726.223.116.89.86.5
Average temperature (°C)-0.20.42.59.714.019.422.222.019.512.85.33.4
Average night temperature (°C)-2.7-3.3-0.54.89.815.518.518.616.19.91.81.2
Absolute minimum temperature (°C)-19.4-17.9-10.5-2.22.79.715.313.911.4-2.1-10.1-7.6

Cook County monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.011.012.013.014.015.015.014.013.011.010.09.0
Daylight mean duration (h)9.510.611.913.414.615.214.913.812.511.19.89.2
Daylight minimum duration (h)9.010.011.012.014.015.014.013.011.010.09.09.0
Sunshine mean duration (h)3.17.76.99.110.411.911.810.78.46.47.03.8
Precipitation (mm)6590757947613081111701253573
Sunny days111812152119131310112115
Rainy days1291815101118182020814
Snow days811000000012

Cook County - weather forecast by months

Cook County weather in januaryCook County weather in februaryCook County weather in marchCook County weather in aprilCook County weather in mayCook County weather in juneCook County weather in julyCook County weather in augustCook County weather in septemberCook County weather in octoberCook County weather in novemberCook County weather in december

Best time to visit Cook County:

The best time to visit Cook County during the most sunny months:

  • May — 10.4(h)
  • June — 11.9(h)
  • July — 11.8(h)
  • August — 10.7(h)

The largest precipitation sum in Cook County is at

  • July — 308(mm)
  • September — 170(mm)

    • Weather forecast in the closest to Cook County admin centers

    Weather forecast in the closest towns to Cook County

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    MapTrains schedule
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    Frequently asked questions

    When is the best time to visit Cook County?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Cook County.
    What is the weather like in Cook County?
    See average temperature, rainfall and daylight hours for Cook County by month in the table above.
    How many sunny days does Cook County have?
    The monthly weather statistics above show sunshine and rainfall patterns for Cook County throughout the year.