| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 48°F | 40°F | 9.1" |
| February | 34°F | 51°F | 41°F | 3.8" |
| March | 43°F | 66°F | 54°F | 6.1" |
| April | 49°F | 70°F | 59°F | 9.6" |
| May | 59°F | 83°F | 70°F | 1.7" |
| June | 68°F | 91°F | 79°F | 6.4" |
| July | 71°F | 90°F | 79°F | 8.1" |
| August | 74°F | 96°F | 84°F | 8.8" |
| September | 65°F | 87°F | 75°F | 4.9" |
| October | 52°F | 75°F | 62°F | 11.5" |
| November | 42°F | 63°F | 52°F | 6.2" |
| December | 32°F | 50°F | 40°F | 6.0" |
| Index | Lepanto | Arkansas | National |
| Air quality index | 45 | 38 | 42 |
| Pollution index | 2,860,420 | 1,487,822 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 221 |
| Days with moderate air quality | 139 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.040% |
| Mercury | 0.640% |
| City | Population | Air Quality Index | National Avg. |
| Dyess, AR | 295 | 45 | 10.0% |
| Trumann, AR | 7,000 | 45 | 10.0% |
| Keiser, AR | 791 | 45 | 10.0% |
| Etowah, AR | 324 | 45 | 10.0% |
| Bay, AR | 2,341 | 45 | 10.0% |
| Lepanto, AR | 1,922 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Laurium, MI | 1,922 | 8 | 84.0% |
| Woodcreek, TX | 1,922 | 44 | 12.0% |
| Newtown, CT | 1,921 | 43 | 14.0% |
| Plantsville, CT | 1,923 | 41 | 18.0% |
| Emerson, GA | 1,921 | 44 | 12.0% |
| Lepanto, AR | 1,922 | 45 | 10.0% |
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