| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 47°F | 36°F | 12.8" |
| February | 30°F | 52°F | 40°F | 4.2" |
| March | 40°F | 64°F | 51°F | 2.6" |
| April | 43°F | 67°F | 55°F | 5.3" |
| May | 54°F | 77°F | 65°F | 6.0" |
| June | 63°F | 84°F | 73°F | 6.7" |
| July | 65°F | 89°F | 76°F | 7.8" |
| August | 68°F | 92°F | 79°F | 9.3" |
| September | 60°F | 84°F | 71°F | 6.6" |
| October | 48°F | 73°F | 59°F | 8.2" |
| November | 38°F | 62°F | 49°F | 2.5" |
| December | 27°F | 49°F | 37°F | 4.3" |
| Index | Highfill | Arkansas | National |
| Air quality index | 44 | 38 | 42 |
| Pollution index | 182,136 | 1,487,822 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 267 |
| Days with moderate air quality | 98 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Bella Vista, AR | 28,819 | 44 | 12.0% |
| Decatur, AR | 1,536 | 44 | 12.0% |
| Pea Ridge, AR | 5,960 | 44 | 12.0% |
| Elm Springs, AR | 2,442 | 44 | 12.0% |
| Lowell, AR | 9,433 | 44 | 12.0% |
| Highfill, AR | 1,383 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Monrovia, IN | 1,383 | 54 | 8.0% |
| Harwich Center, MA | 1,383 | 36 | 28.0% |
| Bel Air CDP, MD | 1,383 | 46 | 8.0% |
| Coldstream, OH | 1,383 | 54 | 8.0% |
| Tiltonsville, OH | 1,383 | 39 | 22.0% |
| Highfill, AR | 1,383 | 44 | 12.0% |
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