| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 44°F | 29°F | 3.5" |
| February | 20°F | 46°F | 32°F | 3.4" |
| March | 24°F | 50°F | 36°F | 2.7" |
| April | 28°F | 56°F | 41°F | 1.6" |
| May | 33°F | 64°F | 48°F | 1.5" |
| June | 39°F | 74°F | 57°F | 0.6" |
| July | 44°F | 83°F | 64°F | 0.3" |
| August | 42°F | 81°F | 62°F | 0.5" |
| September | 37°F | 75°F | 56°F | 0.4" |
| October | 31°F | 64°F | 45°F | 2.1" |
| November | 25°F | 53°F | 37°F | 1.9" |
| December | 19°F | 45°F | 31°F | 3.7" |
| Index | Volcano | California | National |
| Air quality index | 39 | 55 | 50 |
| Pollution index | 1,641,280 | 18,106,726 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 331 |
| Days with moderate air quality | 33 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.090% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City, State | Population | Air Quality Index | National Avg. |
| Jackson, CA | 4,630 | 39 | 22% |
| Sutter Creek, CA | 2,487 | 39 | 22% |
| Buckhorn, CA | 2,725 | 39 | 22% |
| Martell, CA | 312 | 39 | 22% |
| Rail Road Flat, CA | 265 | 39 | 22% |
| Volcano, CA | 24 | 39 | 22% |
| City, State | Population | Air Quality Index | National Avg. |
| Long Lake, SD | 24 | 20 | 60% |
| Carlton, AL | 24 | 42 | 16% |
| Beaverdam, NV | 24 | 44 | 12% |
| Berea, NE | 24 | 19 | 62% |
| Kupreanof, AK | 24 | 20 | 60% |
| Volcano, CA | 24 | 39 | 22% |
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