| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 58°F | 46°F | 8.6" |
| February | 40°F | 63°F | 50°F | 6.8" |
| March | 43°F | 67°F | 54°F | 6.5" |
| April | 46°F | 72°F | 58°F | 4.4" |
| May | 51°F | 79°F | 63°F | 2.6" |
| June | 55°F | 87°F | 69°F | 5.0" |
| July | 57°F | 90°F | 71°F | 3.3" |
| August | 57°F | 89°F | 70°F | 3.3" |
| September | 55°F | 89°F | 69°F | 4.3" |
| October | 49°F | 79°F | 63°F | 5.1" |
| November | 42°F | 67°F | 53°F | 4.2" |
| December | 36°F | 58°F | 46°F | 6.4" |
| Index | Isleton | California | National |
| Air quality index | 45 | 55 | 42 |
| Pollution index | 2,457,150 | 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 | 0.010% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Country Club, CA | 9,242 | 45 | 10.0% |
| Thornton, CA | 903 | 45 | 10.0% |
| Rio Vista, CA | 9,407 | 45 | 10.0% |
| Knightsen, CA | 1,100 | 45 | 10.0% |
| Bethel Island, CA | 2,015 | 45 | 10.0% |
| Isleton, CA | 495 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Gambell, AK | 495 | 38 | 24.0% |
| Wilkerson, CA | 495 | 47 | 6.0% |
| Ideal, GA | 495 | 39 | 22.0% |
| Hume, IL | 495 | 42 | 16.0% |
| Fairview, MO | 495 | 37 | 26.0% |
| Isleton, CA | 495 | 45 | 10.0% |
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