| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 55°F | 41°F | 0.5" |
| February | 35°F | 58°F | 45°F | 0.7" |
| March | 45°F | 68°F | 55°F | 1.0" |
| April | 52°F | 75°F | 62°F | 1.1" |
| May | 59°F | 81°F | 69°F | 2.6" |
| June | 69°F | 92°F | 79°F | 0.9" |
| July | 71°F | 95°F | 82°F | 8.3" |
| August | 71°F | 95°F | 82°F | 2.5" |
| September | 63°F | 87°F | 73°F | 0.7" |
| October | 52°F | 77°F | 62°F | 2.4" |
| November | 42°F | 66°F | 52°F | 2.1" |
| December | 33°F | 54°F | 42°F | 3.8" |
| Index | Sulphur | Oklahoma | National |
| Air quality index | 43 | 55 | 42 |
| Pollution index | 1,277,600 | 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 | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.030% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Fitzhugh, OK | 319 | 43 | 14.0% |
| Dougherty, OK | 227 | 43 | 14.0% |
| Hickory, OK | 196 | 43 | 14.0% |
| Mill Creek, OK | 303 | 43 | 14.0% |
| Roff, OK | 781 | 43 | 14.0% |
| Sulphur, OK | 5,023 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Pawcatuck, CT | 5,024 | 37 | 26.0% |
| Ettrick, VA | 5,024 | 44 | 12.0% |
| Orange, VA | 5,024 | 40 | 20.0% |
| Hutchinson Island South, FL | 5,025 | 36 | 28.0% |
| Utica, MI | 5,025 | 56 | 12.0% |
| Sulphur, OK | 5,023 | 43 | 14.0% |
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