| 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 | Vacaville | California | National |
| Air quality index | 35 | 55 | 50 |
| Pollution index | 2,457,150 | 18,106,726 | 5,066,862 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 330 |
| Days with moderate air quality | 31 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| 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. |
| Green Valley CDP (Los Angeles County), CA | 1,000 | 35 | 30% |
| Moskowite Corner, CA | 198 | 35 | 30% |
| Green Valley, CA | 1,224 | 35 | 30% |
| Suisun City, CA | 29,045 | 35 | 30% |
| Allendale, CA | 1,349 | 35 | 30% |
| Vacaville, CA | 95,607 | 35 | 30% |
| City, State | Population | Air Quality Index | National Avg. |
| Dearborn, MI | 95,520 | 56 | 12% |
| South Gate, CA | 95,219 | 72 | 44% |
| Portsmouth, VA | 96,071 | 40 | 20% |
| Mission Viejo, CA | 96,178 | 89 | 78% |
| New Bedford, MA | 94,988 | 44 | 12% |
| Vacaville, CA | 95,607 | 35 | 30% |
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