| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 30°F | 52°F | 40°F | 5.6" |
| February | 30°F | 56°F | 42°F | 5.0" |
| March | 39°F | 65°F | 51°F | 4.3" |
| April | 47°F | 74°F | 60°F | 5.0" |
| May | 56°F | 80°F | 67°F | 7.1" |
| June | 64°F | 88°F | 75°F | 4.1" |
| July | 68°F | 90°F | 78°F | 5.7" |
| August | 68°F | 89°F | 77°F | 6.1" |
| September | 62°F | 83°F | 71°F | 3.2" |
| October | 49°F | 73°F | 60°F | 3.7" |
| November | 38°F | 63°F | 49°F | 4.8" |
| December | 35°F | 56°F | 45°F | 5.4" |
| Index | Richfield | North Carolina | National |
| Air quality index | 40 | 35 | 42 |
| Pollution index | 691,074 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 292 |
| Days with moderate air quality | 73 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Granite Quarry, NC | 2,973 | 40 | 20.0% |
| East Spencer, NC | 1,382 | 40 | 20.0% |
| New London, NC | 640 | 40 | 20.0% |
| Rockwell, NC | 2,090 | 40 | 20.0% |
| Albemarle, NC | 16,073 | 40 | 20.0% |
| Richfield, NC | 892 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Diablo Grande, CA | 892 | 49 | 2.0% |
| Aurelia, IA | 892 | 35 | 30.0% |
| Lilydale, MN | 892 | 46 | 8.0% |
| Mesquite, NM | 892 | 51 | 2.0% |
| Montandon, PA | 892 | 35 | 30.0% |
| Richfield, NC | 892 | 40 | 20.0% |
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