| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 46°F | 32°F | 0.5" |
| February | 20°F | 48°F | 33°F | 0.5" |
| March | 28°F | 58°F | 42°F | 0.9" |
| April | 33°F | 63°F | 47°F | 2.0" |
| May | 42°F | 70°F | 55°F | 2.3" |
| June | 53°F | 85°F | 68°F | 2.0" |
| July | 59°F | 88°F | 73°F | 2.3" |
| August | 57°F | 86°F | 71°F | 2.1" |
| September | 49°F | 79°F | 63°F | 1.7" |
| October | 37°F | 67°F | 51°F | 1.3" |
| November | 28°F | 58°F | 41°F | 0.4" |
| December | 18°F | 45°F | 30°F | 0.5" |
| Index | Golden | Colorado | National |
| Air quality index | 58 | 38 | 42 |
| Pollution index | 513,217 | 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 | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.040% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Black Hawk, CO | 98 | 47 | 6.0% |
| Superior, CO | 13,292 | 47 | 6.0% |
| Floyd Hill, CO | 824 | 47 | 6.0% |
| Broomfield, CO | 69,444 | 47 | 6.0% |
| Coal Creek, CO | 2,605 | 47 | 6.0% |
| Golden, CO | 20,391 | 58 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Forest Lake, MN | 20,393 | 46 | 8.0% |
| Crest Hill, IL | 20,388 | 55 | 10.0% |
| Elko, NV | 20,396 | 14 | 72.0% |
| Northfield, MN | 20,399 | 37 | 26.0% |
| Bayshore Gardens, FL | 20,380 | 38 | 24.0% |
| Golden, CO | 20,391 | 58 | 16.0% |
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