| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 53°F | 39°F | 1.5" |
| February | 30°F | 57°F | 42°F | 1.8" |
| March | 41°F | 68°F | 53°F | 3.1" |
| April | 49°F | 76°F | 62°F | 5.1" |
| May | 58°F | 82°F | 70°F | 6.1" |
| June | 69°F | 91°F | 80°F | 4.8" |
| July | 72°F | 96°F | 84°F | 4.1" |
| August | 71°F | 95°F | 82°F | 4.1" |
| September | 62°F | 88°F | 74°F | 4.1" |
| October | 50°F | 77°F | 63°F | 3.5" |
| November | 39°F | 66°F | 52°F | 2.5" |
| December | 29°F | 53°F | 40°F | 2.5" |
| Index | Chelsea | Oklahoma | National |
| Air quality index | 45 | 55 | 42 |
| Pollution index | 261,723 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 249 |
| Days with moderate air quality | 114 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Big Cabin, OK | 181 | 38 | 24.0% |
| New Alluwe, OK | 62 | 38 | 24.0% |
| Adair, OK | 669 | 38 | 24.0% |
| White Oak, OK | 284 | 38 | 24.0% |
| Nowata, OK | 3,673 | 45 | 10.0% |
| Chelsea, OK | 2,158 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Colquitt, GA | 2,158 | 35 | 30.0% |
| North Seekonk, MA | 2,158 | 44 | 12.0% |
| Vernonia, OR | 2,158 | 18 | 64.0% |
| Arial, SC | 2,158 | 46 | 8.0% |
| Lac La Ronge 156, SK | 2,158 | n/a | |
| Chelsea, OK | 2,158 | 45 | 10.0% |
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