| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 60°F | 47°F | 5.6" |
| February | 41°F | 64°F | 52°F | 4.8" |
| March | 45°F | 69°F | 56°F | 4.6" |
| April | 47°F | 74°F | 60°F | 2.5" |
| May | 52°F | 82°F | 67°F | 0.7" |
| June | 57°F | 91°F | 74°F | 0.3" |
| July | 60°F | 96°F | 77°F | 0.0" |
| August | 59°F | 95°F | 75°F | 0.0" |
| September | 56°F | 92°F | 73°F | 0.1" |
| October | 50°F | 81°F | 64°F | 1.9" |
| November | 43°F | 68°F | 54°F | 2.3" |
| December | 37°F | 59°F | 47°F | 4.6" |
| Index | Dixon | California | National |
| Air quality index | 55 | 55 | 50 |
| Pollution index | 2,457,150 | 18,106,726 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 155 |
| Days with moderate air quality | 175 |
| Days w/ poor A.Q. for sensitive groups | 31 |
| Days with unhealthy air quality | 4 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.020% |
| City, State | Population | Air Quality Index | National Avg. |
| Hartley, CA | 2,988 | 43 | 14% |
| Vacaville, CA | 95,607 | 43 | 14% |
| Winters, CA | 6,974 | 43 | 14% |
| Elmira, CA | 208 | 43 | 14% |
| Suisun City, CA | 29,045 | 43 | 14% |
| Dixon, CA | 19,144 | 55 | 10% |
| City, State | Population | Air Quality Index | National Avg. |
| Milledgeville, GA | 19,146 | 41 | 18% |
| Bellwood, IL | 19,146 | 60 | 20% |
| Horizon City, TX | 19,142 | 51 | 2% |
| Stillwater, MN | 19,142 | 44 | 12% |
| Matteson, IL | 19,146 | 60 | 20% |
| Dixon, CA | 19,144 | 55 | 10% |