| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 60°F | 48°F | 6.6" |
| February | 40°F | 64°F | 50°F | 6.8" |
| March | 48°F | 72°F | 59°F | 10.3" |
| April | 55°F | 79°F | 66°F | 8.7" |
| May | 61°F | 84°F | 72°F | 6.8" |
| June | 69°F | 91°F | 78°F | 7.6" |
| July | 70°F | 91°F | 79°F | 6.7" |
| August | 71°F | 92°F | 79°F | 9.4" |
| September | 66°F | 88°F | 75°F | 8.4" |
| October | 55°F | 79°F | 65°F | 3.9" |
| November | 44°F | 69°F | 55°F | 4.1" |
| December | 42°F | 62°F | 51°F | 6.6" |
| Index | Seminary | Mississippi | National |
| Air quality index | 35 | 40 | 42 |
| Pollution index | 364,090 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 358 |
| Days with good air quality | 298 |
| Days with moderate air quality | 60 |
| 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 | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Mount Olive, MS | 1,776 | 35 | 30.0% |
| Glendale, MS | 1,483 | 35 | 30.0% |
| Sumrall, MS | 2,276 | 35 | 30.0% |
| Rawls Springs, MS | 1,708 | 35 | 30.0% |
| Bassfield, MS | 241 | 35 | 30.0% |
| Seminary, MS | 267 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Manchester, CA | 267 | 33 | 34.0% |
| No Name, CO | 267 | 44 | 12.0% |
| Cantril, IA | 267 | 29 | 42.0% |
| Allerton, IL | 267 | 42 | 16.0% |
| Compton, IL | 267 | 0 | 100.0% |
| Seminary, MS | 267 | 35 | 30.0% |
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