| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 48°F | 34°F | 2.4" |
| February | 25°F | 51°F | 37°F | 2.1" |
| March | 36°F | 63°F | 48°F | 3.8" |
| April | 45°F | 71°F | 57°F | 5.2" |
| May | 54°F | 78°F | 65°F | 5.9" |
| June | 64°F | 87°F | 75°F | 4.7" |
| July | 68°F | 91°F | 79°F | 4.3" |
| August | 66°F | 90°F | 77°F | 4.0" |
| September | 58°F | 83°F | 69°F | 5.4" |
| October | 46°F | 72°F | 58°F | 4.0" |
| November | 35°F | 61°F | 47°F | 3.2" |
| December | 26°F | 48°F | 36°F | 3.0" |
| Index | Sparta | Missouri | National |
| Air quality index | 39 | 97 | 42 |
| Pollution index | 5,910,880 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 322 |
| Days with moderate air quality | 43 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.090% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.020% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Saddlebrooke, MO | 306 | 18 | 64.0% |
| Spokane, MO | 184 | 18 | 64.0% |
| Rogersville, MO | 4,096 | 39 | 22.0% |
| Fordland, MO | 834 | 39 | 22.0% |
| Fremont Hills, MO | 1,058 | 39 | 22.0% |
| Sparta, MO | 2,167 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Woodside East, DE | 2,167 | 42 | 16.0% |
| Mount Zion, GA | 2,167 | 44 | 12.0% |
| Lincoln Park, NY | 2,167 | 36 | 28.0% |
| Rockwell City, IA | 2,166 | 37 | 26.0% |
| Oakwood, PA | 2,166 | 31 | 38.0% |
| Sparta, MO | 2,167 | 39 | 22.0% |
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