| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 49°F | 41°F | 7.8" |
| February | 35°F | 47°F | 40°F | 8.4" |
| March | 36°F | 49°F | 41°F | 10.1" |
| April | 38°F | 54°F | 45°F | 5.7" |
| May | 46°F | 62°F | 53°F | 3.7" |
| June | 55°F | 71°F | 62°F | 1.4" |
| July | 64°F | 79°F | 71°F | 0.1" |
| August | 63°F | 79°F | 70°F | 0.1" |
| September | 58°F | 74°F | 65°F | 1.4" |
| October | 48°F | 63°F | 54°F | 4.8" |
| November | 40°F | 53°F | 46°F | 7.3" |
| December | 34°F | 46°F | 39°F | 11.7" |
| Index | East Quincy | California | National |
| Air quality index | 46 | 55 | 42 |
| Pollution index | 1,799,830 | 10,473,190 | 2,726,193 |
| 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 | Population | Air Quality Index | National Avg. |
| Cromberg, CA | 322 | 44 | 12.0% |
| Graeagle, CA | 563 | 44 | 12.0% |
| Greenhorn, CA | 207 | 44 | 12.0% |
| Johnsville, CA | 0 | 44 | 12.0% |
| Plumas Eureka, CA | 372 | 44 | 12.0% |
| East Quincy, CA | 2,367 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Lebanon Junction, KY | 2,367 | 39 | 22.0% |
| Huntingdon, QC | 2,367 | n/a | |
| Ashville, AL | 2,368 | 43 | 14.0% |
| Lyons, CO | 2,368 | 47 | 6.0% |
| Neillsville, WI | 2,368 | 34 | 32.0% |
| East Quincy, CA | 2,367 | 46 | 8.0% |