| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 41°F | 28°F | 1.5" |
| February | 24°F | 48°F | 34°F | 0.9" |
| March | 27°F | 56°F | 41°F | 1.2" |
| April | 35°F | 66°F | 50°F | 2.0" |
| May | 43°F | 76°F | 60°F | 1.8" |
| June | 50°F | 86°F | 68°F | 1.3" |
| July | 59°F | 95°F | 77°F | 0.5" |
| August | 56°F | 88°F | 71°F | 3.3" |
| September | 49°F | 80°F | 63°F | 3.4" |
| October | 36°F | 67°F | 50°F | 1.9" |
| November | 26°F | 55°F | 39°F | 1.5" |
| December | 16°F | 39°F | 26°F | 2.1" |
| Index | Olathe | Colorado | National |
| Air quality index | 44 | 38 | 42 |
| Pollution index | 1,091,100 | 2,068,342 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 289 |
| Days with moderate air quality | 75 |
| 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 | 0.003% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Orchard City, CO | 3,164 | 44 | 12.0% |
| Montrose, CO | 19,396 | 44 | 12.0% |
| Delta, CO | 8,893 | 44 | 12.0% |
| Hotchkiss, CO | 1,230 | 44 | 12.0% |
| Olathe, CO | 1,800 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Flatonia, TX | 1,800 | 44 | 12.0% |
| Cana, VA | 1,800 | 45 | 10.0% |
| Daniels, WV | 1,800 | 295 | 490.0% |
| Bon Accord, AB | 1,800 | n/a | |
| Priest River, ID | 1,799 | 43 | 14.0% |
| Olathe, CO | 1,800 | 44 | 12.0% |
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