| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 58°F | 47°F | 3.5" |
| February | 42°F | 62°F | 51°F | 3.9" |
| March | 45°F | 67°F | 56°F | 3.7" |
| April | 48°F | 74°F | 60°F | 2.1" |
| May | 55°F | 84°F | 69°F | 0.7" |
| June | 61°F | 92°F | 76°F | 0.3" |
| July | 65°F | 98°F | 81°F | 0.0" |
| August | 63°F | 95°F | 79°F | 0.0" |
| September | 59°F | 90°F | 74°F | 0.2" |
| October | 51°F | 79°F | 64°F | 1.2" |
| November | 44°F | 65°F | 54°F | 2.6" |
| December | 38°F | 57°F | 47°F | 4.1" |
| Index | Quincy | California | National |
| Air quality index | 46 | 55 | 50 |
| Pollution index | 1,799,830 | 18,106,726 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 224 |
| Days with moderate air quality | 136 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 2 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.004% |
| City, State | Population | Air Quality Index | National Avg. |
| Cromberg, CA | 116 | 44 | 12% |
| Greenhorn, CA | 199 | 44 | 12% |
| Johnsville, CA | 0 | 44 | 12% |
| Spring Garden, CA | 17 | 44 | 12% |
| Indian Falls, CA | 100 | 46 | 8% |
| Quincy, CA | 1,582 | 46 | 8% |
| City, State | Population | Air Quality Index | National Avg. |
| Searles Valley, CA | 1,582 | 15 | 70% |
| Babbitt, MN | 1,582 | 35 | 30% |
| Leona Valley, CA | 1,582 | 72 | 44% |
| Gorham, NH | 1,582 | 40 | 20% |
| White Island Shores, MA | 1,582 | 36 | 28% |
| Quincy, CA | 1,582 | 46 | 8% |
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