Heating 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, heating degree days were 0.0 degrees Fahrenheit on 14 August 2026, as on 13 August.
Sample. This daily series has 16,662 observations. The time span covered by the series goes from January 1981 to August 2026.
History. Here are some statistics we calculated on the full sample: degree days hit a trough of 0.0 degrees Fahrenheit on 23 May 1981; they hit a maximum of 78.0 on 24 December 1983; they were equal on average to 16.6.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2026-08-12 | 0.0 |
| 2026-08-13 | 0.0 |
| 2026-08-14 | 0.0 |
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Series Metadata
| Field | Value |
|---|---|
| Description | Heating degree days |
| Country | Illinois (US) |
| Economic concept | Heating 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 | 65F - (max_daily_temperature + min_daily_temperature) / 2 |
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