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 5.0 degrees Fahrenheit on 23 September 2025, compared to 7.0 on 22 September.
Sample. The daily series shown in the chart has a total of 16,337 data points. The period covered by the series stretches from January 1981 to September 2025.
History. Here are some statistics calculated on the full sample: degree days averaged 2.5 degrees Fahrenheit; they reached a trough of 0.0 on 1 January 1981; they reached their maximum of 24.0 on 14 July 1995.
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 |
Series in the same data set
Discover the other time series included in this data set.