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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 58°F | 46°F | 2.6" |
| February | 39°F | 64°F | 51°F | 2.0" |
| March | 43°F | 70°F | 56°F | 2.0" |
| April | 46°F | 76°F | 60°F | 1.5" |
| May | 51°F | 84°F | 66°F | 0.3" |
| June | 56°F | 92°F | 73°F | 0.2" |
| July | 59°F | 97°F | 77°F | 0.1" |
| August | 59°F | 95°F | 76°F | 0.1" |
| September | 56°F | 92°F | 72°F | 0.2" |
| October | 49°F | 81°F | 64°F | 0.7" |
| November | 41°F | 68°F | 54°F | 1.2" |
| December | 36°F | 58°F | 47°F | 2.5" |
| Index | Jackson | California | National |
| Air quality index | 39 | 55 | 42 |
| Pollution index | 1,641,280 | 10,473,190 | 2,726,193 |
| 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 | Population | Air Quality Index | National Avg. |
| Buckhorn, CA | 2,175 | 39 | 22.0% |
| Martell, CA | 113 | 39 | 22.0% |
| Rail Road Flat, CA | 97 | 39 | 22.0% |
| Volcano, CA | 45 | 39 | 22.0% |
| Mokelumne Hill, CA | 484 | 39 | 22.0% |
| Jackson, CA | 4,844 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Ocean Bluff-Brant Rock, MA | 4,843 | 43 | 14.0% |
| Glen Head, NY | 4,843 | 51 | 2.0% |
| Stone Park, IL | 4,842 | 55 | 10.0% |
| Luray, VA | 4,842 | 36 | 28.0% |
| Cornwallis, MB | 4,840 | n/a | |
| Jackson, CA | 4,844 | 39 | 22.0% |
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