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 0.0 degrees Fahrenheit on 23 September 2025, as on the previous day.
Sample. The daily series shown in the graph has 16,337 observations in total. The series covers the time period going from January 1981 to September 2025.
History. Here's a peek at a few simple statistics we calculated on the entire sample: degree days reached their minimum of 0.0 degrees Fahrenheit on 23 May 1981; they hit a maximum of 78.0 on 24 December 1983; they were equal on average to 16.6.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2025-09-21 | 0.0 |
| 2025-09-22 | 0.0 |
| 2025-09-23 | 0.0 |
Nugget of wisdom. To simplify complex analyses, we group time series into worksheets and datasets. By scrolling down, you will find how we structured further information related to the statistics found here.
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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 |
Series in the same data set
Discover the other time series included in this data set.