| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 50°F | 38°F | 2.0" |
| February | 30°F | 52°F | 40°F | 2.2" |
| March | 39°F | 63°F | 50°F | 4.8" |
| April | 48°F | 72°F | 60°F | 6.3" |
| May | 55°F | 77°F | 66°F | 5.8" |
| June | 65°F | 87°F | 75°F | 2.8" |
| July | 68°F | 91°F | 79°F | 4.7" |
| August | 67°F | 89°F | 77°F | 3.8" |
| September | 59°F | 83°F | 70°F | 3.9" |
| October | 49°F | 73°F | 60°F | 2.9" |
| November | 39°F | 61°F | 49°F | 2.9" |
| December | 31°F | 51°F | 40°F | 3.2" |
| Index | Harrison | Arkansas | National |
| Air quality index | 36 | 38 | 42 |
| Pollution index | 993,329 | 1,487,822 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 347 |
| Days with moderate air quality | 18 |
| 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 | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Bergman, AR | 674 | 36 | 28.0% |
| Zinc, AR | 67 | 36 | 28.0% |
| Valley Springs, AR | 273 | 36 | 28.0% |
| Diamond City, AR | 982 | 36 | 28.0% |
| Western Grove, AR | 666 | 36 | 28.0% |
| Harrison, AR | 13,124 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Monfort Heights, OH | 13,124 | 54 | 8.0% |
| La Grange Park, IL | 13,129 | 55 | 10.0% |
| Timberlake, VA | 13,130 | 26 | 48.0% |
| Prince Rupert, BC | 13,113 | n/a | |
| Warrenville, IL | 13,137 | 55 | 10.0% |
| Harrison, AR | 13,124 | 36 | 28.0% |
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