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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 33°F | 22°F | 2.3" |
| February | 20°F | 39°F | 28°F | 3.1" |
| March | 34°F | 58°F | 44°F | 4.4" |
| April | 42°F | 65°F | 52°F | 10.1" |
| May | 55°F | 77°F | 65°F | 14.1" |
| June | 64°F | 85°F | 73°F | 6.4" |
| July | 67°F | 90°F | 78°F | 4.8" |
| August | 67°F | 87°F | 76°F | 9.9" |
| September | 58°F | 82°F | 68°F | 6.9" |
| October | 46°F | 69°F | 56°F | 8.1" |
| November | 31°F | 54°F | 40°F | 1.8" |
| December | 16°F | 34°F | 24°F | 2.8" |
| Index | Grant | Iowa | National |
| Air quality index | 40 | 39 | 42 |
| Pollution index | 338,773 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 283 |
| Days with moderate air quality | 82 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Massena, IA | 387 | 39 | 22.0% |
| Griswold, IA | 1,179 | 40 | 20.0% |
| Corning, IA | 1,671 | 40 | 20.0% |
| Villisca, IA | 1,162 | 40 | 20.0% |
| Lewis, IA | 513 | 40 | 20.0% |
| Grant, IA | 61 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Klukwan, AK | 61 | 20 | 60.0% |
| Jennette, AR | 61 | 45 | 10.0% |
| Yucca, AZ | 61 | 13 | 74.0% |
| Mount Hebron, CA | 61 | 29 | 42.0% |
| Rodriguez Camp, CA | 61 | 67 | 34.0% |
| Grant, IA | 61 | 40 | 20.0% |