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 12 February 2026, unchanged with respect to 11 February 2026.
Sample. In this daily series, there are 16,479 observations overall. The period covered by the series stretches from January 1981 to February 2026.
History. Here's a peek at a few summary statistics computed on the whole sample: degree days reached a trough of 0.0 degrees Fahrenheit on 1 January 1981; they reached their highest level of 24.0 on 14 July 1995; they averaged 2.5.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2026-02-10 | 0.0 |
| 2026-02-11 | 0.0 |
| 2026-02-12 | 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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