| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 58°F | 46°F | 7.1" |
| February | 40°F | 62°F | 50°F | 4.5" |
| March | 47°F | 71°F | 58°F | 7.6" |
| April | 54°F | 77°F | 65°F | 11.1" |
| May | 61°F | 83°F | 71°F | 9.5" |
| June | 69°F | 90°F | 79°F | 8.5" |
| July | 72°F | 93°F | 81°F | 8.6" |
| August | 71°F | 93°F | 81°F | 7.5" |
| September | 64°F | 88°F | 75°F | 5.5" |
| October | 53°F | 79°F | 64°F | 12.0" |
| November | 44°F | 68°F | 55°F | 9.4" |
| December | 40°F | 60°F | 49°F | 7.6" |
| Index | Downsville | Louisiana | National |
| Air quality index | 34 | 106 | 42 |
| Pollution index | 4,786,940 | 2,526,475 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 335 |
| Days with moderate air quality | 28 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.030% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Farmerville, LA | 3,679 | 34 | 32.0% |
| Choudrant, LA | 1,458 | 34 | 32.0% |
| Vienna, LA | 604 | 34 | 32.0% |
| Bawcomville, LA | 2,150 | 34 | 32.0% |
| Claiborne, LA | 11,904 | 34 | 32.0% |
| Downsville, LA | 146 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Chinese Camp, CA | 146 | 39 | 22.0% |
| Sharpsburg, IA | 146 | 43 | 14.0% |
| Harmon, IL | 146 | 42 | 16.0% |
| Hettick, IL | 146 | 40 | 20.0% |
| Stoy, IL | 146 | 36 | 28.0% |
| Downsville, LA | 146 | 34 | 32.0% |
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