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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 38°F | 30°F | 1.7" |
| February | 25°F | 40°F | 32°F | 2.3" |
| March | 36°F | 54°F | 44°F | 1.1" |
| April | 46°F | 67°F | 55°F | 4.3" |
| May | 55°F | 76°F | 64°F | 0.0" |
| June | 66°F | 86°F | 75°F | 3.0" |
| July | 66°F | 86°F | 75°F | 7.9" |
| August | 66°F | 87°F | 76°F | 4.8" |
| September | 59°F | 81°F | 69°F | 8.6" |
| October | 47°F | 69°F | 57°F | 1.4" |
| November | 36°F | 56°F | 46°F | 11.8" |
| December | 25°F | 38°F | 31°F | 7.1" |
| Index | Montrose | Illinois | National |
| Air quality index | 40 | 41 | 42 |
| Pollution index | 583,029 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 245 |
| Days with good air quality | 224 |
| Days with moderate air quality | 21 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Greenup, IL | 1,754 | 40 | 20.0% |
| Strasburg, IL | 528 | 40 | 20.0% |
| Watson, IL | 795 | 40 | 20.0% |
| Jewett, IL | 281 | 40 | 20.0% |
| Wheeler, IL | 178 | 40 | 20.0% |
| Montrose, IL | 202 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Fairford, AL | 202 | 42 | 16.0% |
| Ratcliff, AR | 202 | 36 | 28.0% |
| Carrizo, AZ | 202 | 44 | 12.0% |
| Greenhorn, CA | 202 | 44 | 12.0% |
| Alpine, CO | 202 | 44 | 12.0% |
| Montrose, IL | 202 | 40 | 20.0% |
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