Reference Data in Chicago 12 indicators covering reference data for Chicago. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 173.34 Degree days 2025 down 3.6% 537th Cooling and heating degree days - Cities and FUAs — Change in cooling -59.97 Degree days 2025 down 12.0% 1154th Cooling and heating degree days - Cities and FUAs 2,539 Degree days 2025 down 5.4% 162nd Cooling and heating degree days - Cities and FUAs — Change in heating -204.02 Degree days 2025 down 245.5% 468th Precipitation - Cities and FUAs — Extreme precipitation days 9.95 Days per year 2024 down 8.5% 477th Precipitation - Cities and FUAs — Change in extreme precipitation 0.1892 Days per year 2024 down 83.0% 825th Dependency ratio - Cities and FUAs 25.8 Percentage of population aged 15-64 years 2024 up 34.4% 789th Wind threats - Cities and FUAs — Exposure to wind threats 0 Percentage of area 2023 — 273rd Coastal flooding - Cities and FUAs — Built-up area exposure to 0 Percentage of built-up area 2022 — 277th Main mode of transport to work - Cities and FUAs — Employed persons 3.61 million Persons 2023 down 5.8% 4th Internet speed - Cities and FUAs — Downloading speed 5.2 Percentage of national value 2025 down 8.8% 672nd Internet speed - Cities and FUAs — Uploading speed -23.7 Percentage of national value 2025 up 2.9% 1099th