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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 49°F | 35°F | 0.9" |
| February | 28°F | 52°F | 38°F | 1.3" |
| March | 40°F | 64°F | 51°F | 3.7" |
| April | 49°F | 72°F | 59°F | 4.6" |
| May | 57°F | 79°F | 67°F | 7.0" |
| June | 68°F | 89°F | 78°F | 5.4" |
| July | 71°F | 94°F | 82°F | 3.6" |
| August | 69°F | 93°F | 80°F | 4.6" |
| September | 61°F | 84°F | 71°F | 4.6" |
| October | 49°F | 74°F | 60°F | 3.4" |
| November | 39°F | 62°F | 49°F | 2.3" |
| December | 28°F | 49°F | 38°F | 1.7" |
| Index | Welch | Oklahoma | National |
| Air quality index | 38 | 55 | 42 |
| Pollution index | 947,958 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 289 |
| Days with moderate air quality | 73 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| 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. |
| Narcissa, OK | 137 | 38 | 24.0% |
| Dotyville, OK | 106 | 38 | 24.0% |
| Chetopa, KS | 1,158 | 38 | 24.0% |
| Afton, OK | 906 | 38 | 24.0% |
| Miami, OK | 13,176 | 38 | 24.0% |
| Welch, OK | 663 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Central City, AR | 663 | 36 | 28.0% |
| Kiowa, CO | 663 | 58 | 16.0% |
| North Washington, CO | 663 | 58 | 16.0% |
| Roeville, FL | 663 | 41 | 18.0% |
| Kennard, IN | 663 | 28 | 44.0% |
| Welch, OK | 663 | 38 | 24.0% |
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