| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 50°F | 37°F | 3.1" |
| February | 29°F | 52°F | 40°F | 2.6" |
| March | 38°F | 63°F | 50°F | 5.5" |
| April | 47°F | 71°F | 58°F | 7.3" |
| May | 55°F | 77°F | 65°F | 7.4" |
| June | 64°F | 86°F | 75°F | 4.2" |
| July | 67°F | 90°F | 78°F | 5.1" |
| August | 66°F | 90°F | 77°F | 4.7" |
| September | 58°F | 82°F | 69°F | 5.0" |
| October | 46°F | 72°F | 58°F | 5.2" |
| November | 37°F | 62°F | 49°F | 3.5" |
| December | 29°F | 51°F | 39°F | 3.8" |
| Index | Greenland | Arkansas | National |
| Air quality index | 44 | 38 | 42 |
| Pollution index | 2,360,150 | 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 | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Bethel Heights, AR | 2,490 | 44 | 12.0% |
| Fayetteville, AR | 86,622 | 44 | 12.0% |
| Prairie Grove, AR | 6,236 | 44 | 12.0% |
| Winslow, AR | 377 | 44 | 12.0% |
| Elkins, AR | 3,283 | 44 | 12.0% |
| Greenland, AR | 1,558 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Guthrie Center, IA | 1,558 | 39 | 22.0% |
| Canby, MN | 1,558 | 32 | 36.0% |
| Buxton, NC | 1,558 | 37 | 26.0% |
| Arlington, OH | 1,558 | 39 | 22.0% |
| Hubbard, TX | 1,558 | 41 | 18.0% |
| Greenland, AR | 1,558 | 44 | 12.0% |
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