| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 30°F | 54°F | 40°F | 2.4" |
| February | 33°F | 56°F | 43°F | 5.0" |
| March | 43°F | 68°F | 54°F | 4.7" |
| April | 51°F | 75°F | 62°F | 8.7" |
| May | 59°F | 80°F | 68°F | 12.5" |
| June | 69°F | 90°F | 79°F | 8.0" |
| July | 71°F | 95°F | 82°F | 7.7" |
| August | 70°F | 94°F | 81°F | 7.9" |
| September | 62°F | 86°F | 73°F | 7.9" |
| October | 51°F | 76°F | 62°F | 11.3" |
| November | 41°F | 65°F | 52°F | 6.8" |
| December | 32°F | 53°F | 41°F | 9.8" |
| Index | Okmulgee | Oklahoma | National |
| Air quality index | 5 | 55 | 42 |
| Pollution index | 14,334,000 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 286 |
| Days with good air quality | 269 |
| Days with moderate air quality | 15 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.190% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.170% |
| Mercury | 0.090% |
| City | Population | Air Quality Index | National Avg. |
| Grayson, OK | 178 | 5 | 90.0% |
| Morris, OK | 1,739 | 5 | 90.0% |
| Hoffman, OK | 103 | 5 | 90.0% |
| Hitchita, OK | 60 | 5 | 90.0% |
| Schulter, OK | 556 | 5 | 90.0% |
| Okmulgee, OK | 11,768 | 5 | 90.0% |
| City | Population | Air Quality Index | National Avg. |
| Arkansas City, KS | 11,767 | 40 | 20.0% |
| Cantley, QC | 11,767 | n/a | |
| Freehold, NJ | 11,755 | 41 | 18.0% |
| Richfield, WI | 11,782 | 44 | 12.0% |
| Madison, IN | 11,783 | 35 | 30.0% |
| Okmulgee, OK | 11,768 | 5 | 90.0% |
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