| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 39°F | 25°F | 0.4" |
| February | 22°F | 47°F | 33°F | 0.5" |
| March | 29°F | 59°F | 43°F | 0.5" |
| April | 35°F | 66°F | 49°F | 0.7" |
| May | 43°F | 75°F | 58°F | 0.9" |
| June | 53°F | 89°F | 71°F | 0.3" |
| July | 59°F | 91°F | 74°F | 1.0" |
| August | 56°F | 88°F | 71°F | 1.1" |
| September | 48°F | 80°F | 63°F | 1.2" |
| October | 37°F | 67°F | 50°F | 1.0" |
| November | 26°F | 55°F | 39°F | 0.5" |
| December | 16°F | 39°F | 27°F | 0.5" |
| Index | Montrose | Colorado | National |
| Air quality index | 44 | 38 | 42 |
| Pollution index | 805,080 | 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 | 0.020% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Colona, CO | 42 | 44 | 12.0% |
| Olathe, CO | 1,800 | 44 | 12.0% |
| Montrose, CO | 19,396 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Five Forks, SC | 19,399 | 46 | 8.0% |
| Fairwood, WA | 19,400 | 45 | 10.0% |
| Langley Park, MD | 19,391 | 47 | 6.0% |
| Monroe, WA | 19,403 | 45 | 10.0% |
| Yorkville, IL | 19,386 | 0 | 100.0% |
| Montrose, CO | 19,396 | 44 | 12.0% |
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