| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 29°F | 20°F | 1.9" |
| February | 16°F | 32°F | 24°F | 2.2" |
| March | 30°F | 51°F | 39°F | 4.5" |
| April | 40°F | 63°F | 51°F | 9.1" |
| May | 51°F | 74°F | 62°F | 9.6" |
| June | 62°F | 83°F | 72°F | 7.8" |
| July | 63°F | 86°F | 74°F | 6.7" |
| August | 63°F | 83°F | 72°F | 8.6" |
| September | 54°F | 79°F | 66°F | 5.4" |
| October | 44°F | 66°F | 54°F | 6.3" |
| November | 29°F | 50°F | 38°F | 3.0" |
| December | 13°F | 27°F | 21°F | 2.4" |
| Index | Colo | Iowa | National |
| Air quality index | 37 | 39 | 42 |
| Pollution index | 1,171,930 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 214 |
| Days with good air quality | 210 |
| Days with moderate air quality | 4 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.060% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.004% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Nevada, IA | 6,737 | 37 | 26.0% |
| Maxwell, IA | 739 | 37 | 26.0% |
| Zearing, IA | 547 | 37 | 26.0% |
| Cambridge, IA | 941 | 37 | 26.0% |
| Clemons, IA | 152 | 37 | 26.0% |
| Colo, IA | 764 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Seligman, AZ | 764 | 43 | 14.0% |
| Ballard, CA | 764 | 44 | 12.0% |
| Lockridge, IA | 764 | 29 | 42.0% |
| St. Clair, MN | 764 | 46 | 8.0% |
| Highland Hills, OH | 764 | 50 | = 100 |
| Colo, IA | 764 | 37 | 26.0% |
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