| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 44°F | 32°F | 1.3" |
| February | 25°F | 47°F | 35°F | 1.8" |
| March | 38°F | 61°F | 48°F | 3.5" |
| April | 47°F | 71°F | 58°F | 5.4" |
| May | 56°F | 78°F | 67°F | 4.9" |
| June | 66°F | 87°F | 76°F | 4.2" |
| July | 69°F | 90°F | 79°F | 4.5" |
| August | 67°F | 88°F | 77°F | 2.9" |
| September | 58°F | 81°F | 69°F | 4.2" |
| October | 47°F | 71°F | 58°F | 3.4" |
| November | 37°F | 59°F | 47°F | 2.4" |
| December | 27°F | 46°F | 36°F | 2.6" |
| Index | Holts Summit | Missouri | National |
| Air quality index | 39 | 97 | 42 |
| Pollution index | 1,482,560 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 245 |
| Days with good air quality | 238 |
| Days with moderate air quality | 7 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Ashland, MO | 3,956 | 38 | 24.0% |
| Fulton, MO | 12,696 | 38 | 24.0% |
| Pierpont, MO | 72 | 38 | 24.0% |
| Westphalia, MO | 411 | 39 | 22.0% |
| Hartsburg, MO | 120 | 39 | 22.0% |
| Holts Summit, MO | 4,790 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| West Milton, OH | 4,790 | 47 | 6.0% |
| Nassau Village-Ratliff, FL | 4,789 | 43 | 14.0% |
| Shenandoah, PA | 4,789 | 42 | 16.0% |
| Westlake, LA | 4,788 | 45 | 10.0% |
| Wrightsboro, NC | 4,788 | 34 | 32.0% |
| Holts Summit, MO | 4,790 | 39 | 22.0% |
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