| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 35°F | 23°F | 0.9" |
| February | 17°F | 39°F | 26°F | 1.2" |
| March | 30°F | 54°F | 41°F | 2.2" |
| April | 41°F | 67°F | 53°F | 4.9" |
| May | 51°F | 76°F | 63°F | 4.9" |
| June | 62°F | 86°F | 74°F | 6.5" |
| July | 66°F | 89°F | 77°F | 4.2" |
| August | 64°F | 87°F | 75°F | 5.1" |
| September | 56°F | 81°F | 68°F | 3.7" |
| October | 43°F | 68°F | 55°F | 3.2" |
| November | 31°F | 54°F | 42°F | 1.8" |
| December | 18°F | 38°F | 27°F | 2.1" |
| Index | Colfax | Iowa | National |
| Air quality index | 39 | 39 | 42 |
| Pollution index | 3,955,060 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 306 |
| Days with moderate air quality | 59 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Maxwell, IA | 739 | 37 | 26.0% |
| Baxter, IA | 935 | 37 | 26.0% |
| Elkhart, IA | 695 | 39 | 22.0% |
| Newton, IA | 15,160 | 39 | 22.0% |
| Prairie City, IA | 1,827 | 39 | 22.0% |
| Colfax, IA | 1,886 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Memphis, MO | 1,886 | 29 | 42.0% |
| Saint-Narcisse, QC | 1,886 | n/a | |
| Sulligent, AL | 1,887 | 39 | 22.0% |
| Wabasso Beach, FL | 1,885 | 36 | 28.0% |
| Kualapuu, HI | 1,887 | 15 | 70.0% |
| Colfax, IA | 1,886 | 39 | 22.0% |
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