| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 45°F | 31°F | 1.8" |
| February | 22°F | 46°F | 32°F | 2.0" |
| March | 30°F | 58°F | 42°F | 2.1" |
| April | 35°F | 63°F | 47°F | 4.0" |
| May | 44°F | 70°F | 55°F | 5.2" |
| June | 54°F | 84°F | 68°F | 4.6" |
| July | 60°F | 89°F | 73°F | 5.7" |
| August | 59°F | 87°F | 71°F | 4.5" |
| September | 51°F | 79°F | 63°F | 5.7" |
| October | 39°F | 67°F | 51°F | 4.1" |
| November | 29°F | 56°F | 41°F | 2.2" |
| December | 19°F | 44°F | 30°F | 2.9" |
| Index | Westminster | Colorado | National |
| Air quality index | 58 | 38 | 42 |
| Pollution index | 24,040 | 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 | 0.000% |
| Benzene | 0.000% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Lafayette, CO | 27,952 | 47 | 6.0% |
| Boulder, CO | 108,777 | 47 | 6.0% |
| Valmont, CO | 98 | 47 | 6.0% |
| Louisville, CO | 19,342 | 47 | 6.0% |
| Broomfield, CO | 69,444 | 47 | 6.0% |
| Westminster, CO | 114,832 | 58 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Springfield, IL | 115,075 | 40 | 20.0% |
| The Woodlands, TX | 114,532 | 52 | 4.0% |
| West Jordan, UT | 115,181 | 51 | 2.0% |
| Carlsbad, CA | 114,411 | 64 | 28.0% |
| Murrieta, CA | 114,066 | 89 | 78.0% |
| Westminster, CO | 114,832 | 58 | 16.0% |
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