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 17.0 degrees Fahrenheit on 28 December 2025, compared to 20.0 on 27 December 2025.
Sample. There are 16,433 records in the daily time series displayed in the figure above. The time range covered by the series extends from January 1981 to December 2025.
History. Check out a few descriptive statistics we computed on the full sample: degree days had an average value of 16.6 degrees Fahrenheit; they recorded their highest level of 78.0 on 24 December 1983; they reached a minimum of 0.0 on 23 May 1981.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2025-12-26 | 19.0 |
| 2025-12-27 | 20.0 |
| 2025-12-28 | 17.0 |
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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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