| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 55°F | 41°F | 3.1" |
| February | 32°F | 59°F | 44°F | 2.4" |
| March | 41°F | 69°F | 54°F | 4.4" |
| April | 50°F | 78°F | 63°F | 5.5" |
| May | 58°F | 83°F | 70°F | 7.2" |
| June | 69°F | 92°F | 80°F | 4.0" |
| July | 72°F | 96°F | 83°F | 4.0" |
| August | 71°F | 95°F | 82°F | 4.2" |
| September | 63°F | 89°F | 75°F | 4.8" |
| October | 51°F | 79°F | 63°F | 5.2" |
| November | 40°F | 68°F | 53°F | 3.3" |
| December | 31°F | 56°F | 42°F | 3.5" |
| Index | Altus | Arkansas | National |
| Air quality index | 35 | 38 | 50 |
| Pollution index | 2,360,150 | 1,270,108 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 317 |
| Days with moderate air quality | 48 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| Branch, AR | 363 | 35 | 30% |
| Hartman, AR | 578 | 35 | 30% |
| Ratcliff, AR | 159 | 35 | 30% |
| Caulksville, AR | 226 | 35 | 30% |
| Morrison Bluff, AR | 50 | 35 | 30% |
| Altus, AR | 754 | 35 | 30% |
| City, State | Population | Air Quality Index | National Avg. |
| Sylvan Beach, NY | 754 | 32 | 36% |
| Hissop, AL | 754 | 38 | 24% |
| Wood Heights, MO | 754 | 58 | 16% |
| Carolina, RI | 754 | 44 | 12% |
| McDowell, KY | 755 | 45 | 10% |
| Altus, AR | 754 | 35 | 30% |