| 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. |
| 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% |
| Bridgeport, OK | 99 | 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% |
Here are the best places to live in Oklahoma
Most Dangerous States In The US
Check out the 10 most dangerous cities in Oklahoma
Check out the 10 safest cities in Oklahoma