| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 52°F | 39°F | 1.9" |
| February | 32°F | 55°F | 42°F | 2.0" |
| March | 43°F | 67°F | 53°F | 3.5" |
| April | 50°F | 74°F | 61°F | 5.1" |
| May | 58°F | 80°F | 68°F | 6.2" |
| June | 68°F | 89°F | 78°F | 4.2" |
| July | 71°F | 93°F | 81°F | 4.5" |
| August | 70°F | 93°F | 81°F | 3.7" |
| September | 62°F | 86°F | 73°F | 4.5" |
| October | 51°F | 75°F | 62°F | 4.1" |
| November | 40°F | 64°F | 51°F | 3.0" |
| December | 31°F | 52°F | 40°F | 2.2" |
| Index | Hulbert | Oklahoma | National |
| Air quality index | 36 | 55 | 42 |
| Pollution index | 2,448,980 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 291 |
| Days with good air quality | 269 |
| Days with moderate air quality | 22 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.310% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.100% |
| Mercury | 0.200% |
| City | Population | Air Quality Index | National Avg. |
| Muskogee, OK | 37,337 | 5 | 90.0% |
| Fort Gibson, OK | 3,966 | 5 | 90.0% |
| Okay, OK | 496 | 5 | 90.0% |
| Mazie, OK | 83 | 5 | 90.0% |
| Mulberry, OK | 98 | 5 | 90.0% |
| Hulbert, OK | 549 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Leslie, AR | 549 | 36 | 28.0% |
| Smelterville, ID | 549 | 43 | 14.0% |
| St. Leonard, MD | 549 | 41 | 18.0% |
| Terry, MT | 549 | 33 | 34.0% |
| Deercroft, NC | 549 | 41 | 18.0% |
| Hulbert, OK | 549 | 36 | 28.0% |
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