Cooling degree days (F) - Illinois (US) - NOAA - Daily
This series is part of the dataset: Heating and cooling degree days (NOAA)
Download Full Dataset (.xlsx)Latest updates. In Illinois, cooling degree days were 1.0 degrees Fahrenheit on 21 June 2026, compared to 4.0 on 20 June.
Sample. There are 16,608 data points overall in the daily series shown in the graph above. The time period covered by the series goes from January 1981 to June 2026.
History. Have a look at a few summary statistics calculated on the entire sample: degree days hit a minimum of 0.0 degrees Fahrenheit on 1 January 1981; they reached their highest level of 24.0 on 14 July 1995; they had a mean value of 2.5.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2026-06-19 | 2.0 |
| 2026-06-20 | 4.0 |
| 2026-06-21 | 1.0 |
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Series Metadata
| Field | Value |
|---|---|
| Description | Cooling degree days |
| Country | Illinois (US) |
| Economic concept | Cooling needs |
| Data type | Estimate based on daily minimum and maximum temperatures |
| Deflation method | Not applicable |
| Seasonally adjusted | No |
| Rescaling | Population-weighted averages of weather-station observations |
| Frequency | Daily |
| Unit | Degrees Fahrenheit |
| Source | NOAA National Weather Service |
| Source type | Federal Administration |
| Data licence | Not copyrightable under U.S. law |
| Measure type | (max_daily_temperature + min_daily_temperature) / 2 - 65F |
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