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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 43°F | 67°F | 54°F | 1.1" |
| February | 46°F | 71°F | 58°F | 0.6" |
| March | 51°F | 78°F | 65°F | 0.8" |
| April | 56°F | 85°F | 71°F | 0.3" |
| May | 64°F | 93°F | 79°F | 0.2" |
| June | 74°F | 104°F | 90°F | 0.0" |
| July | 82°F | 105°F | 93°F | 0.8" |
| August | 80°F | 104°F | 92°F | 1.3" |
| September | 74°F | 98°F | 86°F | 1.0" |
| October | 63°F | 88°F | 75°F | 0.3" |
| November | 52°F | 77°F | 64°F | 0.4" |
| December | 43°F | 65°F | 53°F | 1.2" |
| Index | Carefree | Arizona | National |
| Air quality index | 74 | 57 | 42 |
| Pollution index | 4,063,380 | 9,766,019 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 50 |
| Days with moderate air quality | 261 |
| Days w/ poor A.Q. for sensitive groups | 42 |
| Days with unhealthy air quality | 2 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Anthem, AZ | 23,508 | 74 | 48.0% |
| Fountain Hills, AZ | 25,167 | 74 | 48.0% |
| Cave Creek, AZ | 5,766 | 74 | 48.0% |
| Rio Verde, AZ | 2,327 | 74 | 48.0% |
| New River, AZ | 16,303 | 74 | 48.0% |
| Carefree, AZ | 3,863 | 74 | 48.0% |
| City | Population | Air Quality Index | National Avg. |
| Hopkinton, MA | 3,864 | 40 | 20.0% |
| Forks, WA | 3,864 | 34 | 32.0% |
| Beaupré, QC | 3,861 | n/a | |
| Valdez, AK | 3,865 | 31 | 38.0% |
| Ridgecrest, FL | 3,865 | 43 | 14.0% |
| Carefree, AZ | 3,863 | 74 | 48.0% |
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