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 stood at 32.0 degrees Fahrenheit on 12 February 2026, compared to 31.0 on the previous day.
Sample. The daily series shown in the figure has a total of 16,479 data points. The series covers the time span going from January 1981 to February 2026.
History. Here's a snapshot of some descriptive statistics we computed on the whole sample: degree days had a mean of 16.7 degrees Fahrenheit; they reached a minimum of 0.0 on 23 May 1981; they reached their maximum of 78.0 on 24 December 1983.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2026-02-10 | 30.0 |
| 2026-02-11 | 31.0 |
| 2026-02-12 | 32.0 |
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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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