| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 28°F | 21°F | 1.7" |
| February | 16°F | 30°F | 23°F | 2.3" |
| March | 29°F | 46°F | 36°F | 2.7" |
| April | 39°F | 59°F | 48°F | 4.4" |
| May | 50°F | 71°F | 60°F | 4.6" |
| June | 60°F | 79°F | 69°F | 9.5" |
| July | 64°F | 82°F | 72°F | 7.7" |
| August | 62°F | 80°F | 71°F | 6.1" |
| September | 54°F | 74°F | 63°F | 4.2" |
| October | 43°F | 61°F | 51°F | 4.4" |
| November | 32°F | 47°F | 38°F | 3.3" |
| December | 20°F | 32°F | 26°F | 1.1" |
| Index | Warren | Illinois | National |
| Air quality index | 29 | 41 | 42 |
| Pollution index | 701,052 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 304 |
| Days with moderate air quality | 60 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Apple Canyon Lake, IL | 639 | 29 | 42.0% |
| Gratiot, WI | 270 | 29 | 42.0% |
| Nora, IL | 189 | 29 | 42.0% |
| Browntown, WI | 255 | 29 | 42.0% |
| Apple River, IL | 333 | 29 | 42.0% |
| Warren, IL | 1,208 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| Six Shooter Canyon, AZ | 1,208 | 60 | 20.0% |
| Chebanse, IL | 1,208 | 0 | 100.0% |
| Energy, IL | 1,208 | 43 | 14.0% |
| Valmeyer, IL | 1,208 | 54 | 8.0% |
| Dunes City, OR | 1,208 | 19 | 62.0% |
| Warren, IL | 1,208 | 29 | 42.0% |
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