| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 61°F | 49°F | 1.1" |
| February | 42°F | 67°F | 54°F | 1.0" |
| March | 46°F | 74°F | 59°F | 0.7" |
| April | 49°F | 79°F | 63°F | 0.7" |
| May | 57°F | 87°F | 71°F | 0.3" |
| June | 64°F | 95°F | 80°F | 0.0" |
| July | 71°F | 101°F | 86°F | 0.0" |
| August | 70°F | 99°F | 84°F | 0.0" |
| September | 64°F | 94°F | 79°F | 0.1" |
| October | 54°F | 82°F | 67°F | 0.2" |
| November | 45°F | 70°F | 57°F | 0.5" |
| December | 38°F | 61°F | 49°F | 1.3" |
| Index | Mettler | California | National |
| Air quality index | 67 | 55 | 42 |
| Pollution index | 13,529,800 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 119 |
| Days with moderate air quality | 151 |
| Days w/ poor A.Q. for sensitive groups | 87 |
| Days with unhealthy air quality | 6 |
| Pollutant | Total |
| Arsenic | 0.150% |
| Benzene | 0.190% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.180% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Edmundson Acres, CA | 341 | 67 | 34.0% |
| Lamont, CA | 14,724 | 67 | 34.0% |
| Weedpatch, CA | 2,879 | 67 | 34.0% |
| Arvin, CA | 21,220 | 67 | 34.0% |
| Mettler, CA | 115 | 67 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Nikolai, AK | 115 | 31 | 38.0% |
| Onycha, AL | 115 | 35 | 30.0% |
| Staves, AR | 115 | 32 | 36.0% |
| Wet Camp Village, AZ | 115 | 74 | 48.0% |
| Snelling, CA | 115 | 48 | 4.0% |
| Mettler, CA | 115 | 67 | 34.0% |
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