| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 46°F | 31°F | 4.5" |
| February | 20°F | 48°F | 33°F | 1.1" |
| March | 29°F | 59°F | 43°F | 2.3" |
| April | 35°F | 64°F | 48°F | 3.0" |
| May | 43°F | 72°F | 56°F | 4.6" |
| June | 54°F | 85°F | 69°F | 3.1" |
| July | 59°F | 88°F | 72°F | 8.4" |
| August | 57°F | 84°F | 69°F | 5.6" |
| September | 50°F | 79°F | 63°F | 4.2" |
| October | 38°F | 68°F | 51°F | 2.9" |
| November | 28°F | 57°F | 41°F | 1.4" |
| December | 18°F | 45°F | 30°F | 2.2" |
| Index | Williamsburg | Colorado | National |
| Air quality index | 16 | 38 | 42 |
| Pollution index | 1,162,500 | 2,068,342 | 2,726,193 |
| Measurement | Total |
| Days measured | 62 |
| Days with good air quality | 60 |
| Days with moderate air quality | 2 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Brookside, CO | 224 | 16 | 68.0% |
| Penrose, CO | 3,185 | 16 | 68.0% |
| Cañon City, CO | 16,369 | 16 | 68.0% |
| Rockvale, CO | 548 | 16 | 68.0% |
| Florence, CO | 3,913 | 16 | 68.0% |
| Williamsburg, CO | 533 | 16 | 68.0% |
| City | Population | Air Quality Index | National Avg. |
| Paradise Heights, FL | 533 | 39 | 22.0% |
| Mansfield, GA | 533 | 44 | 12.0% |
| Chicopee, KS | 533 | 37 | 26.0% |
| Kanopolis, KS | 533 | 40 | 20.0% |
| Ingold, NC | 533 | 41 | 18.0% |
| Williamsburg, CO | 533 | 16 | 68.0% |
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