| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 46°F | 36°F | 4.0" |
| February | 34°F | 54°F | 42°F | 2.0" |
| March | 45°F | 67°F | 54°F | 11.3" |
| April | 48°F | 70°F | 58°F | 3.7" |
| May | 61°F | 79°F | 69°F | 8.8" |
| June | 68°F | 86°F | 77°F | 13.3" |
| July | 70°F | 90°F | 80°F | 7.4" |
| August | 72°F | 92°F | 82°F | 14.7" |
| September | 66°F | 87°F | 76°F | 4.0" |
| October | 54°F | 75°F | 63°F | 9.3" |
| November | 42°F | 66°F | 52°F | 3.0" |
| December | 28°F | 50°F | 38°F | 0.9" |
| Index | El Reno | Oklahoma | National |
| Air quality index | 48 | 55 | 42 |
| Pollution index | 395,464 | 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 | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Piedmont, OK | 8,155 | 48 | 4.0% |
| Mustang, OK | 22,228 | 48 | 4.0% |
| Calumet, OK | 531 | 48 | 4.0% |
| Union City, OK | 1,497 | 48 | 4.0% |
| Okarche, OK | 1,398 | 48 | 4.0% |
| El Reno, OK | 19,539 | 48 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Monroe, MI | 19,543 | 1 | 98.0% |
| Upper St. Clair, PA | 19,521 | 56 | 12.0% |
| Montgomery, IL | 19,515 | 0 | 100.0% |
| Makakilo, HI | 19,565 | 30 | 40.0% |
| Salmon Creek, WA | 19,506 | 38 | 24.0% |
| El Reno, OK | 19,539 | 48 | 4.0% |
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