| 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 | Galt | California | National |
| Air quality index | 45 | 55 | 42 |
| Pollution index | 15,476,500 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 229 |
| Days with moderate air quality | 123 |
| Days w/ poor A.Q. for sensitive groups | 12 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.090% |
| Benzene | 0.130% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.130% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Collierville, CA | 2,354 | 45 | 10.0% |
| Lodi, CA | 66,562 | 45 | 10.0% |
| Terminous, CA | 400 | 45 | 10.0% |
| Thornton, CA | 903 | 45 | 10.0% |
| Dogtown, CA | 3,006 | 45 | 10.0% |
| Galt, CA | 26,235 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Clarksburg, MD | 26,234 | 47 | 6.0% |
| Superior, WI | 26,260 | 35 | 30.0% |
| Plainview, NY | 26,267 | 51 | 2.0% |
| Smithtown, NY | 26,197 | 43 | 14.0% |
| Orchards, WA | 26,289 | 38 | 24.0% |
| Galt, CA | 26,235 | 45 | 10.0% |
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