| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 76°F | 47°F | 0.8" |
| February | 19°F | 83°F | 52°F | 0.7" |
| March | 26°F | 88°F | 57°F | 0.3" |
| April | 34°F | 95°F | 66°F | 0.2" |
| May | 43°F | 109°F | 76°F | 0.2" |
| June | 53°F | 110°F | 85°F | 0.4" |
| July | 64°F | 110°F | 87°F | 1.4" |
| August | 62°F | 108°F | 84°F | 0.7" |
| September | 51°F | 103°F | 79°F | 0.4" |
| October | 28°F | 96°F | 68°F | 0.5" |
| November | 16°F | 101°F | 58°F | 0.1" |
| December | 19°F | 73°F | 45°F | 0.3" |
| Index | San Carlos | Arizona | National |
| Air quality index | 42 | 57 | 50 |
| Pollution index | 3,235,590 | 5,576,494 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 308 |
| Days with moderate air quality | 57 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.070% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.050% |
| Mercury | 0.050% |
| City, State | Population | Air Quality Index | National Avg. |
| Rainbow City, AZ | 1,181 | 42 | 16% |
| Peridot, AZ | 1,633 | 42 | 16% |
| Cutter, AZ | 45 | 74 | 48% |
| San Carlos, AZ | 4,440 | 42 | 16% |
| City, State | Population | Air Quality Index | National Avg. |
| Beaver, PA | 4,441 | 6 | 88% |
| Montgomery, NY | 4,438 | 36 | 28% |
| St. James, NC | 4,438 | 39 | 22% |
| Boulder Creek, CA | 4,442 | 36 | 28% |
| Three Rivers, OR | 4,438 | 32 | 36% |
| San Carlos, AZ | 4,440 | 42 | 16% |