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 21.0 degrees Fahrenheit on 13 November 2025, versus 23.0 on 12 November.
Sample. In this daily time series, there are 16,388 observations. The period covered by the series goes from January 1981 to November 2025.
History. Take a look at a few simple statistics computed on the full sample: degree days had a mean value of 16.6 degrees Fahrenheit; they achieved a maximum of 78.0 on 24 December 1983; they recorded a bottom of 0.0 on 23 May 1981.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2025-11-11 | 31.0 |
| 2025-11-12 | 23.0 |
| 2025-11-13 | 21.0 |
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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 |