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 stood at 1.0 degrees Fahrenheit on 21 June 2026, compared to 0.0 on 20 June 2026.
Sample. In the daily time series plotted above, there are 16,608 observations overall. The series covers the period stretching from January 1981 to June 2026.
History. Here's a glimpse of some statistics calculated on the whole sample: degree days recorded their maximum of 78.0 degrees Fahrenheit on 24 December 1983; they recorded a bottom of 0.0 on 23 May 1981; they had a mean of 16.7.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2026-06-19 | 0.0 |
| 2026-06-20 | 0.0 |
| 2026-06-21 | 1.0 |
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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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