| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 34°F | 27°F | 2.6" |
| February | 20°F | 35°F | 27°F | 1.8" |
| March | 28°F | 47°F | 37°F | 2.5" |
| April | 37°F | 60°F | 48°F | 4.0" |
| May | 47°F | 70°F | 58°F | 3.5" |
| June | 56°F | 79°F | 68°F | 3.3" |
| July | 61°F | 82°F | 72°F | 3.6" |
| August | 60°F | 81°F | 70°F | 4.8" |
| September | 53°F | 75°F | 63°F | 3.4" |
| October | 43°F | 63°F | 53°F | 5.5" |
| November | 33°F | 51°F | 42°F | 2.7" |
| December | 25°F | 39°F | 32°F | 2.5" |
| Index | Watervliet | Michigan | National |
| Air quality index | 39 | 69 | 42 |
| Pollution index | 1,797,130 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 260 |
| Days with good air quality | 232 |
| Days with moderate air quality | 26 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Lawrence, MI | 918 | 38 | 24.0% |
| Decatur, MI | 1,935 | 38 | 24.0% |
| Hartford, MI | 2,588 | 39 | 22.0% |
| St. Joseph, MI | 8,328 | 39 | 22.0% |
| Fair Plain, MI | 7,148 | 39 | 22.0% |
| Watervliet, MI | 2,082 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Bellevue, IA | 2,082 | 42 | 16.0% |
| Fairmont City, IL | 2,082 | 54 | 8.0% |
| Genoa, OH | 2,082 | 40 | 20.0% |
| Morrisville, NY | 2,081 | 27 | 46.0% |
| Greenwich, NY | 2,083 | 35 | 30.0% |
| Watervliet, MI | 2,082 | 39 | 22.0% |
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