| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 49°F | 37°F | 1.9" |
| February | 30°F | 51°F | 39°F | 2.0" |
| March | 40°F | 64°F | 51°F | 3.8" |
| April | 49°F | 73°F | 60°F | 5.2" |
| May | 57°F | 78°F | 67°F | 5.3" |
| June | 66°F | 87°F | 76°F | 2.9" |
| July | 69°F | 90°F | 78°F | 4.2" |
| August | 68°F | 89°F | 78°F | 3.3" |
| September | 60°F | 82°F | 70°F | 2.9" |
| October | 49°F | 72°F | 59°F | 3.0" |
| November | 40°F | 61°F | 49°F | 2.6" |
| December | 31°F | 50°F | 40°F | 3.0" |
| Index | Gainesville | Missouri | National |
| Air quality index | 36 | 97 | 42 |
| Pollution index | 12,814,500 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 347 |
| Days with moderate air quality | 18 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.340% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.100% |
| Mercury | 0.180% |
| City | Population | Air Quality Index | National Avg. |
| Theodosia, MO | 116 | 18 | 64.0% |
| Wasola, MO | 157 | 18 | 64.0% |
| Pontiac, MO | 101 | 36 | 28.0% |
| Sundown, MO | 106 | 36 | 28.0% |
| Midway, AR | 1,004 | 36 | 28.0% |
| Gainesville, MO | 584 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Norwood, CO | 584 | 44 | 12.0% |
| Allenhurst, GA | 584 | 39 | 22.0% |
| Loyall, KY | 584 | 39 | 22.0% |
| Alma, MO | 584 | 47 | 6.0% |
| Duck, NC | 584 | 40 | 20.0% |
| Gainesville, MO | 584 | 36 | 28.0% |
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