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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 35°F | 25°F | 1.1" |
| February | 20°F | 38°F | 28°F | 1.5" |
| March | 33°F | 53°F | 41°F | 1.9" |
| April | 43°F | 65°F | 53°F | 3.7" |
| May | 53°F | 75°F | 64°F | 5.1" |
| June | 63°F | 84°F | 73°F | 5.5" |
| July | 66°F | 87°F | 76°F | 4.1" |
| August | 64°F | 84°F | 74°F | 3.3" |
| September | 56°F | 79°F | 67°F | 3.3" |
| October | 45°F | 68°F | 55°F | 3.0" |
| November | 33°F | 53°F | 42°F | 2.4" |
| December | 23°F | 39°F | 31°F | 1.9" |
| Index | Montrose | Iowa | National |
| Air quality index | 29 | 39 | 42 |
| Pollution index | 802,114 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 120 |
| Days with good air quality | 101 |
| Days with moderate air quality | 19 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| 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. |
| Revere, MO | 35 | 29 | 42.0% |
| Basco, IL | 85 | 29 | 42.0% |
| Hamilton, IL | 2,808 | 29 | 42.0% |
| Alexandria, MO | 105 | 29 | 42.0% |
| Donnellson, IA | 908 | 29 | 42.0% |
| Montrose, IA | 844 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| Tuntutuliak, AK | 844 | 31 | 38.0% |
| Danielsville, GA | 844 | 44 | 12.0% |
| Battle Creek, IA | 844 | 35 | 30.0% |
| Morgan, MN | 844 | 32 | 36.0% |
| Henefer, UT | 844 | 51 | 2.0% |
| Montrose, IA | 844 | 29 | 42.0% |
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