Average natural gas rate in Illinois
Residential average from EIA data, July 2026.
Illinois average
$2.03 per therm
National average
$2.55 per therm
Illinois runs 20.5% below the national average.
Recent months
| Month | Average rate |
|---|---|
| July 2026 | $2.03 per therm |
| June 2026 | $1.90 per therm |
| May 2026 | $1.48 per therm |
Source: U.S. Energy Information Administration, residential sector.
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