| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 55°F | 38°F | 1.3" |
| February | 29°F | 58°F | 42°F | 1.0" |
| March | 33°F | 64°F | 49°F | 0.8" |
| April | 38°F | 70°F | 55°F | 0.4" |
| May | 46°F | 78°F | 63°F | 0.4" |
| June | 56°F | 90°F | 75°F | 0.5" |
| July | 63°F | 91°F | 77°F | 2.4" |
| August | 61°F | 88°F | 74°F | 2.6" |
| September | 54°F | 84°F | 69°F | 1.2" |
| October | 43°F | 75°F | 58°F | 0.8" |
| November | 33°F | 65°F | 48°F | 0.5" |
| December | 26°F | 54°F | 38°F | 1.4" |
| Index | Williamson | Arizona | National |
| Air quality index | 43 | 57 | 42 |
| Pollution index | 5,460,430 | 9,766,019 | 2,726,193 |
| Measurement | Total |
| Days measured | 356 |
| Days with good air quality | 298 |
| Days with moderate air quality | 58 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Paulden, AZ | 5,003 | 43 | 14.0% |
| Chino Valley, AZ | 11,362 | 43 | 14.0% |
| Prescott, AZ | 43,463 | 43 | 14.0% |
| Prescott Valley, AZ | 45,592 | 43 | 14.0% |
| Williamson, AZ | 5,602 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Marlin, TX | 5,602 | 38 | 24.0% |
| Trent Lakes, ON | 5,602 | n/a | |
| Brookshire, TX | 5,601 | 52 | 4.0% |
| Wayne, NE | 5,603 | 35 | 30.0% |
| Waimanalo, HI | 5,599 | 30 | 40.0% |
| Williamson, AZ | 5,602 | 43 | 14.0% |
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