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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 38°F | 29°F | 3.3" |
| February | 24°F | 40°F | 31°F | 3.5" |
| March | 36°F | 55°F | 44°F | 3.9" |
| April | 45°F | 67°F | 55°F | 9.3" |
| May | 55°F | 75°F | 64°F | 5.6" |
| June | 64°F | 84°F | 73°F | 7.9" |
| July | 66°F | 86°F | 76°F | 5.0" |
| August | 65°F | 86°F | 74°F | 5.1" |
| September | 57°F | 80°F | 67°F | 6.0" |
| October | 46°F | 68°F | 56°F | 5.6" |
| November | 36°F | 54°F | 44°F | 3.6" |
| December | 28°F | 42°F | 34°F | 3.6" |
| Index | Harvel | Illinois | National |
| Air quality index | 40 | 41 | 42 |
| Pollution index | 5,136,080 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 360 |
| Days with good air quality | 287 |
| Days with moderate air quality | 73 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.090% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.390% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Farmersville, IL | 867 | 40 | 20.0% |
| Witt, IL | 613 | 40 | 20.0% |
| Virden, IL | 3,444 | 40 | 20.0% |
| Standard City, IL | 219 | 40 | 20.0% |
| Irving, IL | 340 | 40 | 20.0% |
| Harvel, IL | 246 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Sanford, AL | 246 | 35 | 30.0% |
| Garland, AR | 246 | 39 | 22.0% |
| Del Muerto, AZ | 246 | 17 | 66.0% |
| Houstonia, MO | 246 | 38 | 24.0% |
| Fort Peck, MT | 246 | 34 | 32.0% |
| Harvel, IL | 246 | 40 | 20.0% |
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