| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 49°F | 40°F | 10.9" |
| February | 34°F | 52°F | 41°F | 7.4" |
| March | 43°F | 68°F | 53°F | 5.4" |
| April | 49°F | 71°F | 59°F | 8.1" |
| May | 59°F | 83°F | 70°F | 9.3" |
| June | 69°F | 90°F | 79°F | 3.3" |
| July | 70°F | 89°F | 79°F | 9.9" |
| August | 72°F | 95°F | 82°F | 1.9" |
| September | 65°F | 87°F | 74°F | 4.3" |
| October | 52°F | 76°F | 62°F | 15.9" |
| November | 42°F | 64°F | 51°F | 5.4" |
| December | 32°F | 50°F | 39°F | 7.9" |
| Index | Lynn | Arkansas | National |
| Air quality index | 45 | 38 | 42 |
| Pollution index | 507,185 | 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 | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Imboden, AR | 805 | 26 | 48.0% |
| Black Rock, AR | 854 | 45 | 10.0% |
| Powhatan, AR | 153 | 45 | 10.0% |
| Smithville, AR | 59 | 45 | 10.0% |
| Minturn, AR | 55 | 45 | 10.0% |
| Lynn, AR | 226 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Fredonia, AL | 226 | 42 | 16.0% |
| Keo, AR | 226 | 45 | 10.0% |
| Sierra Village, CA | 226 | 39 | 22.0% |
| Volga, IA | 226 | 39 | 22.0% |
| Browns, IL | 226 | 36 | 28.0% |
| Lynn, AR | 226 | 45 | 10.0% |
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