| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 51°F | 38°F | 3.2" |
| February | 30°F | 54°F | 40°F | 4.3" |
| March | 41°F | 66°F | 51°F | 4.2" |
| April | 48°F | 73°F | 59°F | 6.2" |
| May | 57°F | 80°F | 68°F | 6.8" |
| June | 69°F | 91°F | 79°F | 8.7" |
| July | 71°F | 94°F | 82°F | 9.5" |
| August | 70°F | 92°F | 81°F | 6.5" |
| September | 62°F | 85°F | 73°F | 6.6" |
| October | 51°F | 75°F | 62°F | 5.4" |
| November | 39°F | 62°F | 49°F | 11.2" |
| December | 29°F | 50°F | 38°F | 3.9" |
| Index | Greenfield | Oklahoma | National |
| Air quality index | 48 | 55 | 42 |
| Pollution index | 286,399 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 204 |
| Days with moderate air quality | 159 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.004% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Bridgeport, OK | 99 | 48 | 4.0% |
| Calumet, OK | 531 | 48 | 4.0% |
| Geary, OK | 895 | 48 | 4.0% |
| Watonga, OK | 2,867 | 48 | 4.0% |
| Hydro, OK | 1,175 | 48 | 4.0% |
| Greenfield, OK | 176 | 48 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Glacier View, AK | 176 | 31 | 38.0% |
| Point Lay, AK | 176 | 38 | 24.0% |
| Alpine, AZ | 176 | 44 | 12.0% |
| Little River, CA | 176 | 33 | 34.0% |
| San Geronimo, CA | 176 | 40 | 20.0% |
| Greenfield, OK | 176 | 48 | 4.0% |
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