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 3.0 degrees Fahrenheit on 28 September 2026, unchanged with respect to 27 September.
Sample. The daily series presented in the graph has 16,707 observations. The span of time covered by the series stretches from January 1981 to September 2026.
History. Here's a peek at a few simple statistics computed on the full sample: degree days peaked at 78.0 degrees Fahrenheit on 24 December 1983; they recorded a bottom of 0.0 on 23 May 1981; they were equal on average to 16.6.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2026-09-26 | 4.0 |
| 2026-09-27 | 3.0 |
| 2026-09-28 | 3.0 |
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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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