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Current Conditions. Radar. Forecasts. Rivers and Lakes. Climate and Past Weather. Local Programs. Daily, Monthly, and Annual Climate Normals for Chicago, IL. This page houses the latest 30-year climate normals (1991-2020) for Chicago. JAN.
This report shows the past weather for Chicago, providing a weather history for 2020. It features all historical weather data series we have available, including the Chicago temperature history for 2020. You can drill down from year to month and even day level reports by clicking on the graphs.
The average wind speed is 14 kph (9 mph). October is generally a mild month. The average temperature is of 13.2 °C (56 °F), with a minimum of 8.5 °C (47.2 °F) and a maximum of 17.8 °C (64.1 °F). On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 0 °C (32 °F).
Temperatures typically reach 100 °F in Chicago just once a year. But it does get into the 90s on an average 21 days a year. The days are above 50 degrees from May to September and nearly every day October. But Chicago only gets that warm for a few days in winter.
The warm season lasts for 3.6 months, from June 2 to September 19, with an average daily high temperature above 73°F. The hottest month of the year in Chicago is July, with an average high of 82°F and low of 70°F. The cold season lasts for 3.2 months, from December 1 to March 8, with an average daily high temperature below 43°F.
Many consider the more moderate temperatures of spring and fall to be the most pleasant. Lake Michigan provides a moderating influence on temperature while boosting the amount of snowfall received in the city. Monthly total precipitation and monthly maximum, average, and minimum temperature in Chicago, based on the 1991-2020 normals. Climatic ...
