Herrin, IL Weather & Climate Normals
What a normal year in Herrin actually looks like
On the 30-year record NOAA keeps for Herrin, IL, the comfort score comes out to 48/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 5 months a year land in the 55–75°F range this site treats as mild.
How much Herrin's weather actually swings
Average temperatures in Herrin run from 32°F in Jan up to 78°F in Jul, a 45.6°F seasonal swing, one of the widest gaps in this dataset.
Herrin, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 41°F | 23°F | 3.36in | 3.2in |
| Feb | 46°F | 26°F | 3.11in | 4in |
| Mar | 56°F | 35°F | 4.52in | 1.3in |
| Apr | 68°F | 44°F | 5.55in | 0in |
| May | 77°F | 55°F | 5.18in | 0in |
| Jun | 85°F | 64°F | 4.6in | 0in |
| Jul | 88°F | 68°F | 4.12in | 0in |
| Aug | 87°F | 65°F | 3.16in | 0in |
| Sep | 81°F | 56°F | 3.44in | 0in |
| Oct | 70°F | 44°F | 3.7in | 0.2in |
| Nov | 56°F | 35°F | 4.49in | 0in |
| Dec | 45°F | 27°F | 3.72in | 2.7in |
If you're timing a visit, Apr, May, Jun, Sep, and Oct are Herrin's mildest stretch; if you're moving there, you should plan around Jul's heat and Jan's cold instead.
How wet Herrin actually gets
Over a typical year, Herrin sees about 48.95in of precipitation a year across roughly 121 days with measurable rain or snow, with 11.4in of snow a year.
Herrin against the rest of the country
Out of 4876 cities scored here, Herrin comes in at 2411; within IL alone it ranks 58 of 330. Population is about 12,253.
Checking the actual forecast
These figures come from Carbondale Sewage Plt, IL US, the NOAA station 8.7 miles from Herrin, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is