| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 30°F | 48°F | 37°F | 16.0" |
| February | 33°F | 52°F | 41°F | 3.3" |
| March | 43°F | 64°F | 52°F | 4.4" |
| April | 47°F | 67°F | 56°F | 7.6" |
| May | 57°F | 77°F | 66°F | 8.2" |
| June | 66°F | 84°F | 74°F | 3.9" |
| July | 68°F | 87°F | 77°F | 5.3" |
| August | 71°F | 91°F | 80°F | 21.7" |
| September | 65°F | 83°F | 73°F | 24.0" |
| October | 52°F | 72°F | 61°F | 0.3" |
| November | 42°F | 62°F | 50°F | 4.6" |
| December | 30°F | 50°F | 38°F | 9.1" |
| Index | Exeter | Missouri | National |
| Air quality index | 18 | 97 | 42 |
| Pollution index | 1,360,620 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 60 |
| Days with good air quality | 58 |
| Days with moderate air quality | 2 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Eagle Rock, MO | 119 | 18 | 64.0% |
| Butterfield, MO | 608 | 18 | 64.0% |
| Emerald Beach, MO | 222 | 18 | 64.0% |
| Cassville, MO | 3,206 | 18 | 64.0% |
| Holiday Island, AR | 2,467 | 18 | 64.0% |
| Exeter, MO | 1,023 | 18 | 64.0% |
| City | Population | Air Quality Index | National Avg. |
| Monte Rio, CA | 1,023 | 34 | 32.0% |
| Otterbein, IN | 1,023 | 42 | 16.0% |
| Orient, NY | 1,023 | 37 | 26.0% |
| Emerald Bay, TX | 1,023 | 36 | 28.0% |
| Chester, VT | 1,023 | 34 | 32.0% |
| Exeter, MO | 1,023 | 18 | 64.0% |
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