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 stood at 0.0 degrees Fahrenheit on 30 March 2026, as on 29 March 2026.
Sample. This daily time series has 16,525 records in total. The period covered by the series extends from January 1981 to March 2026.
History. Here are a few summary statistics calculated on the entire sample: degree days were equal on average to 2.5 degrees Fahrenheit; they hit a trough of 0.0 on 1 January 1981; they achieved a maximum of 24.0 on 14 July 1995.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2026-03-28 | 0.0 |
| 2026-03-29 | 0.0 |
| 2026-03-30 | 0.0 |
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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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