| 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 | 47 | 38 | 50 |
| Pollution index | 539,372 | 1,270,108 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 211 |
| Days with moderate air quality | 153 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| Humnoke, AR | 215 | 47 | 6% |
| Wabbaseka, AR | 281 | 47 | 6% |
| Allport, AR | 189 | 47 | 6% |
| Sherrill, AR | 44 | 47 | 6% |
| Altheimer, AR | 1,028 | 47 | 6% |
| Humphrey, AR | 494 | 47 | 6% |
| City, State | Population | Air Quality Index | National Avg. |
| Glidden, WI | 494 | 37 | 26% |
| Castleberry, AL | 494 | 40 | 20% |
| Coral, PA | 494 | 36 | 28% |
| Seven Valleys, PA | 494 | 45 | 10% |
| Cedar Vale, KS | 494 | 44 | 12% |
| Humphrey, AR | 494 | 47 | 6% |