| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 54°F | 41°F | 2.2" |
| February | 35°F | 57°F | 45°F | 2.0" |
| March | 45°F | 68°F | 55°F | 3.6" |
| April | 52°F | 76°F | 63°F | 5.6" |
| May | 60°F | 81°F | 69°F | 7.1" |
| June | 70°F | 90°F | 79°F | 4.7" |
| July | 72°F | 94°F | 82°F | 4.6" |
| August | 72°F | 94°F | 82°F | 3.6" |
| September | 64°F | 88°F | 74°F | 3.1" |
| October | 52°F | 77°F | 63°F | 4.1" |
| November | 43°F | 66°F | 53°F | 2.7" |
| December | 33°F | 55°F | 43°F | 2.8" |
| Index | Longtown | Oklahoma | National |
| Air quality index | 43 | 55 | 42 |
| Pollution index | 1,454,170 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 272 |
| Days with moderate air quality | 91 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Texanna, OK | 2,371 | 5 | 90.0% |
| Duchess Landing, OK | 48 | 5 | 90.0% |
| Porum, OK | 897 | 5 | 90.0% |
| Stidham, OK | 20 | 43 | 14.0% |
| Indianola, OK | 153 | 43 | 14.0% |
| Longtown, OK | 3,044 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Algoma, WI | 3,044 | 36 | 28.0% |
| Bishopville, SC | 3,043 | 40 | 20.0% |
| East Gaffney, SC | 3,043 | 36 | 28.0% |
| McCormick, SC | 3,043 | 47 | 6.0% |
| West Brattleboro, VT | 3,042 | 34 | 32.0% |
| Longtown, OK | 3,044 | 43 | 14.0% |
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