| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 62°F | 49°F | 4.8" |
| February | 42°F | 65°F | 52°F | 4.8" |
| March | 50°F | 73°F | 60°F | 4.7" |
| April | 57°F | 80°F | 67°F | 4.9" |
| May | 64°F | 86°F | 74°F | 3.5" |
| June | 71°F | 92°F | 80°F | 3.7" |
| July | 73°F | 93°F | 82°F | 4.7" |
| August | 73°F | 94°F | 82°F | 4.7" |
| September | 67°F | 90°F | 77°F | 4.0" |
| October | 55°F | 82°F | 67°F | 3.7" |
| November | 47°F | 71°F | 58°F | 4.2" |
| December | 43°F | 63°F | 52°F | 5.4" |
| Index | Colfax | Louisiana | National |
| Air quality index | 30 | 106 | 42 |
| Pollution index | 724,806 | 2,526,475 | 2,726,193 |
| Measurement | Total |
| Days measured | 119 |
| Days with good air quality | 107 |
| Days with moderate air quality | 12 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.004% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Prospect, LA | 177 | 30 | 40.0% |
| Boyce, LA | 1,236 | 30 | 40.0% |
| Rock Hill, LA | 192 | 30 | 40.0% |
| Creola, LA | 154 | 30 | 40.0% |
| Montgomery, LA | 778 | 30 | 40.0% |
| Colfax, LA | 2,261 | 30 | 40.0% |
| City | Population | Air Quality Index | National Avg. |
| Tremont, IL | 2,261 | 41 | 18.0% |
| Henderson, LA | 2,261 | 41 | 18.0% |
| Paquetville, NB | 2,261 | n/a | |
| Corralitos, CA | 2,260 | 35 | 30.0% |
| Columbus Junction, IA | 2,260 | 32 | 36.0% |
| Colfax, LA | 2,261 | 30 | 40.0% |
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