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 5.0 degrees Fahrenheit on 23 September 2025, versus 7.0 on 22 September 2025.
Sample. There are 16,337 records in the daily series displayed in the figure above. The series covers the time period going from January 1981 to September 2025.
History. Check out a few statistics calculated on the full sample: degree days had an average value of 2.5 degrees Fahrenheit; they reached their maximum of 24.0 on 14 July 1995; they reached their minimum of 0.0 on 1 January 1981.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2025-09-21 | 7.0 |
| 2025-09-22 | 7.0 |
| 2025-09-23 | 5.0 |
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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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