| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 37°F | 29°F | 5.6" |
| February | 23°F | 38°F | 29°F | 5.2" |
| March | 32°F | 48°F | 39°F | 3.4" |
| April | 42°F | 60°F | 50°F | 7.5" |
| May | 51°F | 66°F | 57°F | 7.4" |
| June | 59°F | 73°F | 65°F | 8.8" |
| July | 62°F | 76°F | 68°F | 7.0" |
| August | 61°F | 75°F | 67°F | 6.3" |
| September | 55°F | 69°F | 61°F | 8.5" |
| October | 45°F | 60°F | 51°F | 9.1" |
| November | 34°F | 49°F | 41°F | 5.7" |
| December | 28°F | 42°F | 34°F | 5.3" |
| Index | Monterey | Virginia | National |
| Air quality index | 36 | 58 | 42 |
| Pollution index | 271,619 | 1,561,881 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 349 |
| Days with moderate air quality | 16 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.005% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Durbin, WV | 314 | 36 | 28.0% |
| Deerfield, VA | 228 | 36 | 28.0% |
| Frank, WV | 52 | 36 | 28.0% |
| Arbovale, WV | 124 | 36 | 28.0% |
| Bartow, WV | 79 | 36 | 28.0% |
| Monterey, VA | 174 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Gantt, AL | 174 | 35 | 30.0% |
| St. Stephens, AL | 174 | 42 | 16.0% |
| Antoine, AR | 174 | 32 | 36.0% |
| Red Rock CDP (Apache County), AZ | 174 | 47 | 6.0% |
| Fort Bidwell, CA | 174 | 29 | 42.0% |
| Monterey, VA | 174 | 36 | 28.0% |
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