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 5.0 degrees Fahrenheit on 30 March 2026, compared to 20.0 on 29 March 2026.
Sample. The daily time series displayed in the plot has 16,525 observations. The time period covered by the series stretches from January 1981 to March 2026.
History. Take a look at a few summary statistics calculated 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 achieved a maximum of 78.0 on 24 December 1983.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2026-03-28 | 27.0 |
| 2026-03-29 | 20.0 |
| 2026-03-30 | 5.0 |
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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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