| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 62°F | 46°F | 0.7" |
| February | 36°F | 69°F | 52°F | 0.3" |
| March | 42°F | 77°F | 59°F | 0.2" |
| April | 48°F | 84°F | 67°F | 0.1" |
| May | 56°F | 92°F | 75°F | 0.1" |
| June | 67°F | 103°F | 86°F | 0.3" |
| July | 73°F | 100°F | 86°F | 2.1" |
| August | 71°F | 98°F | 84°F | 1.3" |
| September | 64°F | 93°F | 78°F | 1.3" |
| October | 52°F | 85°F | 68°F | 0.7" |
| November | 42°F | 73°F | 57°F | 0.3" |
| December | 33°F | 61°F | 46°F | 0.6" |
| 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. |
| Peridot, AZ | 1,633 | 42 | 16% |
| Rainbow City, AZ | 1,181 | 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% |
| Boulder Creek, CA | 4,442 | 36 | 28% |
| Three Rivers, OR | 4,438 | 32 | 36% |
| St. James, NC | 4,438 | 39 | 22% |
| Montgomery, NY | 4,438 | 36 | 28% |
| San Carlos, AZ | 4,440 | 42 | 16% |