Freely Downloadable Data Sets Updated Daily

Heating degree days (F) - Illinois (US) - NOAA - Daily

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

Series in the same data set

Discover the other time series included in this data set.

Heating degree days

Series Name Observations Start Date End Date
Heating degree days (F) - Alabama (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Arkansas (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Arizona (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - California (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Colorado (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Connecticut (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Delaware (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Florida (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Georgia (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Iowa (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Idaho (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Illinois (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Indiana (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Kansas (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Kentucky (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Louisiana (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Massachusetts (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Maryland (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Maine (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Michigan (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Minnesota (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Missouri (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Mississippi (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Montana (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - North Carolina (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - North Dakota (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Nebraska (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - New Hampshire (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - New Jersey (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - New Mexico (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Nevada (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - New York (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Ohio (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Oklahoma (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Oregon (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Pennsylvania (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - RhodeIsland (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - South Carolina (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - South Dakota (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Tennessee (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Texas (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Utah (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Virginia (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Vermont (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Washington (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Wisconsin (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - WestVirginia (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - Wyoming (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Heating degree days (F) - United States (excluding Alaska and Hawaii) - NOAA - Daily 16608 1981-01-01 2026-06-21

Cooling degree days

Series Name Observations Start Date End Date
Cooling degree days (F) - Alabama (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Arkansas (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Arizona (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - California (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Colorado (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Connecticut (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Delaware (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Florida (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Georgia (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Iowa (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Idaho (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Illinois (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Indiana (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Kansas (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Kentucky (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Louisiana (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Massachusetts (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Maryland (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Maine (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Michigan (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Minnesota (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Missouri (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Mississippi (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Montana (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - North Carolina (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - North Dakota (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Nebraska (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - New Hampshire (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - New Jersey (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - New Mexico (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Nevada (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - New York (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Ohio (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Oklahoma (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Oregon (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Pennsylvania (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - RhodeIsland (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - South Carolina (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - South Dakota (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Tennessee (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Texas (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Utah (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Virginia (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Vermont (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Washington (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Wisconsin (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - WestVirginia (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - Wyoming (US) - NOAA - Daily 16608 1981-01-01 2026-06-21
Cooling degree days (F) - United States (excluding Alaska and Hawaii) - NOAA - Daily 16608 1981-01-01 2026-06-21