Cooling 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, cooling degree days stood at 10.0 degrees Fahrenheit on 17 September 2026, compared to 7.0 on the previous day.
Sample. In the daily time series presented in the plot, there are 16,696 observations. The time span covered by the series is from January 1981 to September 2026.
History. Here's a glimpse of a few descriptive statistics we calculated on the entire sample: degree days recorded a bottom of 0.0 degrees Fahrenheit on 1 January 1981; they hit a peak of 24.0 on 14 July 1995; they were equal on average to 2.5.
Latest values
| Date | Value - Degrees Fahrenheit |
|---|---|
| 2026-09-15 | 5.00000 |
| 2026-09-16 | 7.00000 |
| 2026-09-17 | 10.0000 |
Nugget of wisdom. Our metadata often contain links to the sources of the time-series data shown on FetchSeries. You can use these links to find more details.
Not for investment purposes. Any financial data found on this web site are not not supposed to be used for investment purposes or as a basis for making financial decisions. Users should seek expert advice and perform independent analysis before pledging money to any investment.
Series Metadata
| Field | Value |
|---|---|
| Description | Cooling degree days |
| Country | Illinois (US) |
| Economic concept | Cooling 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 | (max_daily_temperature + min_daily_temperature) / 2 - 65F |
Series in the same data set
Discover the other time series included in this data set.