| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 55°F | 44°F | 6.6" |
| February | 35°F | 58°F | 46°F | 10.8" |
| March | 43°F | 66°F | 54°F | 6.4" |
| April | 52°F | 76°F | 63°F | 7.8" |
| May | 60°F | 82°F | 70°F | 8.3" |
| June | 68°F | 90°F | 78°F | 9.5" |
| July | 71°F | 92°F | 80°F | 7.7" |
| August | 70°F | 90°F | 79°F | 7.5" |
| September | 65°F | 84°F | 73°F | 13.6" |
| October | 53°F | 75°F | 63°F | 5.4" |
| November | 42°F | 65°F | 53°F | 7.8" |
| December | 39°F | 59°F | 48°F | 7.2" |
| Index | Mar-Mac | North Carolina | National |
| Air quality index | 40 | 35 | 42 |
| Pollution index | 949,752 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 359 |
| Days with good air quality | 237 |
| Days with moderate air quality | 122 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Pine Level, NC | 2,234 | 40 | 20.0% |
| Eureka, NC | 221 | 40 | 20.0% |
| Seven Springs, NC | 46 | 40 | 20.0% |
| Pikeville, NC | 697 | 40 | 20.0% |
| Princeton, NC | 1,436 | 40 | 20.0% |
| Mar-Mac, NC | 3,231 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Hamburg, NJ | 3,231 | 34 | 32.0% |
| El Cerro, NM | 3,231 | 53 | 6.0% |
| West Simsbury, CT | 3,230 | 41 | 18.0% |
| El Cenizo, TX | 3,232 | 41 | 18.0% |
| Opportunity No. 17, AB | 3,232 | n/a | |
| Mar-Mac, NC | 3,231 | 40 | 20.0% |