| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 58°F | 49°F | 2.5" |
| February | 42°F | 62°F | 52°F | 1.6" |
| March | 47°F | 69°F | 59°F | 5.9" |
| April | 52°F | 77°F | 65°F | 3.2" |
| May | 60°F | 86°F | 73°F | 2.5" |
| June | 68°F | 94°F | 82°F | 2.8" |
| July | 71°F | 93°F | 82°F | 6.1" |
| August | 69°F | 88°F | 77°F | 8.5" |
| September | 65°F | 87°F | 76°F | 5.6" |
| October | 56°F | 81°F | 68°F | 3.5" |
| November | 50°F | 73°F | 61°F | 3.3" |
| December | 38°F | 61°F | 49°F | 3.2" |
| Index | Tombstone | Arizona | National |
| Air quality index | 45 | 57 | 42 |
| Pollution index | 4,063,380 | 9,766,019 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 266 |
| Days with moderate air quality | 99 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| 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. |
| Sierra Vista, AZ | 43,756 | 45 | 10.0% |
| St. David, AZ | 1,481 | 45 | 10.0% |
| Tombstone, AZ | 1,205 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Moenkopi, AZ | 1,205 | 45 | 10.0% |
| Georgetown, CO | 1,205 | 47 | 6.0% |
| Hegins, PA | 1,205 | 42 | 16.0% |
| McClure, PA | 1,205 | 44 | 12.0% |
| West Mayfield, PA | 1,205 | 31 | 38.0% |
| Tombstone, AZ | 1,205 | 45 | 10.0% |
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