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| 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 | Greenfield | Missouri | National |
| Air quality index | 39 | 97 | 42 |
| Pollution index | 504,674 | 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 | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Jerico Springs, MO | 234 | 37 | 26.0% |
| Lockwood, MO | 1,078 | 37 | 26.0% |
| Golden City, MO | 639 | 37 | 26.0% |
| Everton, MO | 325 | 39 | 22.0% |
| Arcola, MO | 65 | 39 | 22.0% |
| Greenfield, MO | 1,401 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Bull Valley, IL | 1,401 | 42 | 16.0% |
| Wheaton, MN | 1,401 | 25 | 50.0% |
| Panama, OK | 1,401 | 36 | 28.0% |
| Phoenix, IL | 1,402 | 55 | 10.0% |
| Rich Hill, MO | 1,402 | 37 | 26.0% |
| Greenfield, MO | 1,401 | 39 | 22.0% |
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