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 17 September 2026, the same value recorded on the previous day.
Sample. There are 16,696 records in the daily time series shown in the graph above. The time range covered by the series stretches from January 1981 to September 2026.
History. Here are a few summary statistics computed on the whole sample: degree days hit a peak of 78.0 degrees Fahrenheit on 24 December 1983; they reached a minimum of 0.0 on 23 May 1981; they had a mean value of 16.6.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2026-09-15 | 0 |
| 2026-09-16 | 0 |
| 2026-09-17 | 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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