| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 51°F | 42°F | 3.3" |
| February | 37°F | 55°F | 44°F | 4.0" |
| March | 46°F | 65°F | 55°F | 6.9" |
| April | 55°F | 75°F | 64°F | 8.6" |
| May | 63°F | 82°F | 72°F | 8.2" |
| June | 72°F | 91°F | 80°F | 3.9" |
| July | 73°F | 92°F | 82°F | 4.5" |
| August | 72°F | 91°F | 81°F | 6.8" |
| September | 65°F | 85°F | 74°F | 6.2" |
| October | 53°F | 75°F | 63°F | 4.9" |
| November | 44°F | 63°F | 52°F | 3.4" |
| December | 38°F | 54°F | 45°F | 6.8" |
| Index | Humphrey | Arkansas | National |
| Air quality index | 45 | 38 | 42 |
| Pollution index | 539,372 | 1,487,822 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 235 |
| Days with moderate air quality | 130 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Altheimer, AR | 772 | 45 | 10.0% |
| Stuttgart, AR | 8,617 | 45 | 10.0% |
| Sherrill, AR | 285 | 45 | 10.0% |
| Ulm, AR | 237 | 45 | 10.0% |
| Coy, AR | 65 | 45 | 10.0% |
| Humphrey, AR | 353 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Coleville, CA | 353 | 13 | 74.0% |
| Atalissa, IA | 353 | 32 | 36.0% |
| Rock Island Arsenal, IL | 353 | 46 | 8.0% |
| Earl Park, IN | 353 | 42 | 16.0% |
| Macks Creek, MO | 353 | 39 | 22.0% |
| Humphrey, AR | 353 | 45 | 10.0% |
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