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 28 September 2026, unchanged with respect to the previous day.
Sample. There are 16,707 observations in the daily series shown in the chart above. The span of time covered by the series is from January 1981 to September 2026.
History. Here's a peek at a few summary statistics computed on the entire sample: degree days reached their maximum of 24.0 degrees Fahrenheit on 14 July 1995; they reached a trough of 0.0 on 1 January 1981; they had an average value of 2.5.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2026-09-26 | 0.0 |
| 2026-09-27 | 0.0 |
| 2026-09-28 | 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 |
Series in the same data set
Discover the other time series included in this data set.