| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 48°F | 35°F | 1.7" |
| February | 29°F | 51°F | 39°F | 1.7" |
| March | 40°F | 63°F | 50°F | 3.5" |
| April | 48°F | 71°F | 59°F | 5.6" |
| May | 57°F | 78°F | 67°F | 7.3" |
| June | 67°F | 88°F | 77°F | 6.2" |
| July | 70°F | 92°F | 80°F | 4.0" |
| August | 69°F | 91°F | 79°F | 4.6" |
| September | 61°F | 83°F | 71°F | 4.7" |
| October | 49°F | 72°F | 59°F | 3.9" |
| November | 39°F | 61°F | 49°F | 2.9" |
| December | 29°F | 49°F | 38°F | 2.7" |
| Index | Newtonia | Missouri | National |
| Air quality index | 37 | 97 | 42 |
| Pollution index | 1,360,620 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 324 |
| Days with moderate air quality | 40 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| 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. |
| Exeter, MO | 1,023 | 18 | 64.0% |
| Purdy, MO | 1,312 | 37 | 26.0% |
| Pierce City, MO | 1,462 | 37 | 26.0% |
| Fidelity, MO | 382 | 37 | 26.0% |
| Granby, MO | 2,224 | 37 | 26.0% |
| Newtonia, MO | 183 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Litchfield, CA | 183 | 46 | 8.0% |
| Dinosaur, CO | 183 | 49 | 2.0% |
| Marathon, IA | 183 | 35 | 30.0% |
| Washta, IA | 183 | 35 | 30.0% |
| Schneider, IN | 183 | 55 | 10.0% |
| Newtonia, MO | 183 | 37 | 26.0% |
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