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 10.0 degrees Fahrenheit on 14 May 2026, compared to 8.0 on 13 May.
Sample. The daily series plotted above has 16,570 data points overall. The time range covered by the series is from January 1981 to May 2026.
History. Have a look at a few summary statistics calculated on the entire sample: degree days hit a maximum of 78.0 degrees Fahrenheit on 24 December 1983; they reached their lowest level of 0.0 on 23 May 1981; they had a mean value of 16.7.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2026-05-12 | 6.0 |
| 2026-05-13 | 8.0 |
| 2026-05-14 | 10.0 |
Heads-up. An advantage of our web site is that we publish accurate metadata. Find it below to gain insights on the properties of the time series that you analyze.
Not for investment purposes. Time series and other data accessible on FetchSeries are not suitable for investment purposes or other financial decisions. Users should obtain professional advice and do independent analysis before pledging money to any investment.
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.