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 13 November 2025, as on 12 November.
Sample. This daily time series has a total of 16,388 observations. The series covers the period extending from January 1981 to November 2025.
History. Here's a glimpse of some descriptive statistics we calculated on the whole sample: degree days were equal on average to 2.5 degrees Fahrenheit; they hit a trough of 0.0 on 1 January 1981; they recorded their highest level of 24.0 on 14 July 1995.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2025-11-11 | 0.0 |
| 2025-11-12 | 0.0 |
| 2025-11-13 | 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 |