| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 48°F | 37°F | 6.8" |
| February | 32°F | 52°F | 40°F | 6.0" |
| March | 41°F | 63°F | 51°F | 8.6" |
| April | 51°F | 73°F | 61°F | 8.4" |
| May | 60°F | 82°F | 70°F | 10.2" |
| June | 70°F | 92°F | 80°F | 7.3" |
| July | 71°F | 92°F | 80°F | 9.3" |
| August | 70°F | 91°F | 80°F | 5.8" |
| September | 62°F | 86°F | 73°F | 7.8" |
| October | 51°F | 76°F | 62°F | 8.7" |
| November | 40°F | 63°F | 50°F | 7.3" |
| December | 33°F | 50°F | 41°F | 10.3" |
| Index | Diaz | Arkansas | National |
| Air quality index | 45 | 38 | 42 |
| Pollution index | 485,658 | 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 | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.080% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Newark, AR | 1,290 | 45 | 10.0% |
| Grubbs, AR | 448 | 45 | 10.0% |
| Sulphur Rock, AR | 582 | 45 | 10.0% |
| Newport, AR | 7,552 | 45 | 10.0% |
| Swifton, AR | 1,182 | 45 | 10.0% |
| Diaz, AR | 1,435 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| LeChee, AZ | 1,435 | 45 | 10.0% |
| Lakeshire, MO | 1,435 | 54 | 8.0% |
| Flat Rock CDP, NC | 1,435 | 44 | 12.0% |
| Pioche, NV | 1,435 | 44 | 12.0% |
| Waterville, WA | 1,435 | 24 | 52.0% |
| Diaz, AR | 1,435 | 45 | 10.0% |
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