| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 42°F | 28°F | 2.5" |
| February | 22°F | 48°F | 33°F | 1.1" |
| March | 29°F | 57°F | 41°F | 3.0" |
| April | 33°F | 61°F | 45°F | 4.0" |
| May | 43°F | 71°F | 57°F | 3.8" |
| June | 51°F | 82°F | 66°F | 3.7" |
| July | 59°F | 91°F | 75°F | 5.4" |
| August | 56°F | 85°F | 70°F | 5.6" |
| September | 49°F | 81°F | 64°F | 1.5" |
| October | 39°F | 68°F | 52°F | 4.9" |
| November | 29°F | 58°F | 42°F | 1.2" |
| December | 17°F | 43°F | 29°F | 1.7" |
| Index | Parker | Colorado | National |
| Air quality index | 58 | 38 | 42 |
| Pollution index | 10,406,900 | 2,068,342 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 91 |
| Days with moderate air quality | 252 |
| Days w/ poor A.Q. for sensitive groups | 20 |
| Days with unhealthy air quality | 2 |
| Pollutant | Total |
| Arsenic | 0.080% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.250% |
| Mercury | 0.100% |
| City | Population | Air Quality Index | National Avg. |
| Greenwood Village, CO | 15,100 | 58 | 16.0% |
| Castle Rock, CO | 65,176 | 58 | 16.0% |
| Rock Creek Park, CO | 80 | 58 | 16.0% |
| Glendale, CO | 5,186 | 58 | 16.0% |
| Centennial, CO | 111,331 | 58 | 16.0% |
| Parker, CO | 55,460 | 58 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Lake Havasu City, AZ | 55,463 | 13 | 74.0% |
| Oak Lawn, IL | 55,432 | 55 | 10.0% |
| Blue Springs, MO | 55,415 | 47 | 6.0% |
| Belleville, ON | 55,515 | n/a | |
| Hacienda Heights, CA | 55,386 | 72 | 44.0% |
| Parker, CO | 55,460 | 58 | 16.0% |
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