| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 33°F | 24°F | 2.2" |
| February | 20°F | 34°F | 26°F | 3.0" |
| March | 33°F | 52°F | 42°F | 3.7" |
| April | 41°F | 63°F | 51°F | 6.9" |
| May | 52°F | 75°F | 63°F | 8.3" |
| June | 62°F | 82°F | 72°F | 7.5" |
| July | 66°F | 86°F | 76°F | 8.9" |
| August | 63°F | 84°F | 73°F | 7.8" |
| September | 54°F | 77°F | 64°F | 4.7" |
| October | 43°F | 66°F | 53°F | 5.8" |
| November | 31°F | 50°F | 40°F | 6.8" |
| December | 18°F | 34°F | 26°F | 3.5" |
| Index | Long Grove | Iowa | National |
| Air quality index | 46 | 39 | 42 |
| Pollution index | 4,306,550 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 217 |
| Days with moderate air quality | 145 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.090% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.140% |
| Mercury | 0.110% |
| City | Population | Air Quality Index | National Avg. |
| Low Moor, IA | 326 | 42 | 16.0% |
| Welton, IA | 150 | 42 | 16.0% |
| McCausland, IA | 379 | 42 | 16.0% |
| DeWitt, IA | 5,215 | 42 | 16.0% |
| Princeton, IA | 942 | 42 | 16.0% |
| Long Grove, IA | 893 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Lansing, IA | 893 | 35 | 30.0% |
| Riverton, KS | 893 | 37 | 26.0% |
| Gardiner, MT | 893 | 25 | 50.0% |
| Port Royal, PA | 893 | 44 | 12.0% |
| Hilshire Village, TX | 893 | 52 | 4.0% |
| Long Grove, IA | 893 | 46 | 8.0% |
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