| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 56°F | 40°F | 0.7" |
| February | 32°F | 60°F | 44°F | 1.0" |
| March | 42°F | 71°F | 55°F | 1.4" |
| April | 50°F | 78°F | 63°F | 3.0" |
| May | 59°F | 85°F | 71°F | 4.7" |
| June | 69°F | 94°F | 81°F | 2.8" |
| July | 72°F | 98°F | 85°F | 2.9" |
| August | 72°F | 98°F | 84°F | 3.2" |
| September | 64°F | 90°F | 76°F | 2.8" |
| October | 51°F | 79°F | 64°F | 2.2" |
| November | 40°F | 67°F | 52°F | 1.2" |
| December | 30°F | 55°F | 41°F | 1.1" |
| Index | Meridian | Oklahoma | National |
| Air quality index | 43 | 55 | 42 |
| Pollution index | 906,693 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 285 |
| Days with moderate air quality | 80 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Hastings, OK | 99 | 26 | 48.0% |
| Duncan, OK | 22,529 | 43 | 14.0% |
| Bray, OK | 1,053 | 43 | 14.0% |
| Empire City, OK | 830 | 43 | 14.0% |
| Addington, OK | 95 | 43 | 14.0% |
| Meridian, OK | 13 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Lime Village, AK | 13 | 31 | 38.0% |
| Drytown, CA | 13 | 52 | 4.0% |
| Beaconsfield, IA | 13 | 39 | 22.0% |
| Meyer, IA | 13 | 15 | 70.0% |
| Spencer, ID | 13 | 43 | 14.0% |
| Meridian, OK | 13 | 43 | 14.0% |
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