| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 56°F | 43°F | 3.9" |
| February | 37°F | 60°F | 47°F | 3.5" |
| March | 47°F | 69°F | 56°F | 7.8" |
| April | 54°F | 76°F | 64°F | 7.5" |
| May | 62°F | 82°F | 71°F | 8.3" |
| June | 71°F | 91°F | 80°F | 3.7" |
| July | 73°F | 94°F | 83°F | 4.9" |
| August | 73°F | 95°F | 83°F | 4.9" |
| September | 66°F | 88°F | 76°F | 4.8" |
| October | 54°F | 78°F | 65°F | 5.1" |
| November | 44°F | 67°F | 54°F | 4.6" |
| December | 37°F | 57°F | 46°F | 5.3" |
| Index | Hugo | Oklahoma | National |
| Air quality index | 325 | 55 | 42 |
| Pollution index | 482,541 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 138 |
| Days with good air quality | 120 |
| Days with moderate air quality | 17 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Rattan, OK | 316 | 43 | 14.0% |
| Sawyer, OK | 467 | 325 | 550.0% |
| Fort Towson, OK | 551 | 325 | 550.0% |
| Soper, OK | 211 | 325 | 550.0% |
| Grant, OK | 303 | 325 | 550.0% |
| Hugo, OK | 5,114 | 325 | 550.0% |
| City | Population | Air Quality Index | National Avg. |
| Grandwood Park, IL | 5,114 | 39 | 22.0% |
| Layhill, MD | 5,112 | 47 | 6.0% |
| Worland, WY | 5,112 | 45 | 10.0% |
| Salisbury, MA | 5,116 | 37 | 26.0% |
| Lakehills, TX | 5,116 | 49 | 2.0% |
| Hugo, OK | 5,114 | 325 | 550.0% |
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