| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 58°F | 47°F | 3.3" |
| February | 41°F | 63°F | 51°F | 3.1" |
| March | 44°F | 68°F | 55°F | 2.9" |
| April | 47°F | 74°F | 59°F | 1.8" |
| May | 52°F | 82°F | 65°F | 0.5" |
| June | 57°F | 90°F | 71°F | 0.3" |
| July | 59°F | 95°F | 74°F | 0.0" |
| August | 58°F | 93°F | 73°F | 0.0" |
| September | 56°F | 90°F | 70°F | 0.1" |
| October | 50°F | 79°F | 63°F | 1.2" |
| November | 43°F | 66°F | 53°F | 1.6" |
| December | 38°F | 57°F | 47°F | 3.8" |
| Index | Martell | 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. |
| Valley Springs, CA | 3,890 | 39 | 22.0% |
| Pioneer, CA | 1,224 | 39 | 22.0% |
| Mountain Ranch, CA | 318 | 39 | 22.0% |
| Sutter Creek, CA | 2,638 | 39 | 22.0% |
| San Andreas, CA | 3,729 | 39 | 22.0% |
| Martell, CA | 113 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Peterman, AL | 113 | 37 | 26.0% |
| McNab, AR | 113 | 39 | 22.0% |
| Sehili, AZ | 113 | 17 | 66.0% |
| Guinda, CA | 113 | 31 | 38.0% |
| Monmouth, CA | 113 | 60 | 20.0% |
| Martell, CA | 113 | 39 | 22.0% |
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