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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 52°F | 39°F | 1.9" |
| February | 32°F | 55°F | 42°F | 2.0" |
| March | 43°F | 67°F | 53°F | 3.5" |
| April | 50°F | 74°F | 61°F | 5.1" |
| May | 58°F | 80°F | 68°F | 6.2" |
| June | 68°F | 89°F | 78°F | 4.2" |
| July | 71°F | 93°F | 81°F | 4.5" |
| August | 70°F | 93°F | 81°F | 3.7" |
| September | 62°F | 86°F | 73°F | 4.5" |
| October | 51°F | 75°F | 62°F | 4.1" |
| November | 40°F | 64°F | 51°F | 3.0" |
| December | 31°F | 52°F | 40°F | 2.2" |
| Index | Grandview | Oklahoma | National |
| Air quality index | 36 | 55 | 42 |
| Pollution index | 454,845 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 291 |
| Days with good air quality | 269 |
| Days with moderate air quality | 22 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Fort Gibson, OK | 3,966 | 5 | 90.0% |
| Rocky Mountain, OK | 682 | 36 | 28.0% |
| Welling, OK | 709 | 36 | 28.0% |
| Cedar Crest, OK | 139 | 36 | 28.0% |
| Flint Creek, OK | 735 | 36 | 28.0% |
| Grandview, OK | 1,237 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Oak Grove Heights, AR | 1,237 | 26 | 48.0% |
| Leland Grove, IL | 1,237 | 40 | 20.0% |
| St.-Charles, ON | 1,237 | n/a | |
| March ARB, CA | 1,236 | 89 | 78.0% |
| Boyce, LA | 1,236 | 30 | 40.0% |
| Grandview, OK | 1,237 | 36 | 28.0% |
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