| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 58°F | 47°F | 3.8" |
| February | 39°F | 62°F | 50°F | 3.4" |
| March | 41°F | 66°F | 52°F | 3.0" |
| April | 42°F | 69°F | 55°F | 1.6" |
| May | 46°F | 74°F | 59°F | 0.5" |
| June | 50°F | 80°F | 64°F | 0.3" |
| July | 53°F | 81°F | 65°F | 0.0" |
| August | 53°F | 80°F | 64°F | 0.0" |
| September | 49°F | 82°F | 64°F | 0.1" |
| October | 45°F | 76°F | 59°F | 1.3" |
| November | 40°F | 66°F | 52°F | 1.8" |
| December | 36°F | 58°F | 47°F | 3.8" |
| Index | Green Valley | California | National |
| Air quality index | 35 | 55 | 42 |
| Pollution index | 7,123,510 | 10,473,190 | 2,726,193 |
| 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 | 0.110% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.090% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Yountville, CA | 3,001 | 35 | 30.0% |
| Lemon Hill, CA | 15,104 | 35 | 30.0% |
| Suisun City, CA | 29,459 | 35 | 30.0% |
| Elmira, CA | 234 | 35 | 30.0% |
| Allendale, CA | 1,429 | 35 | 30.0% |
| Green Valley, CA | 1,583 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Resaca, GA | 1,583 | 43 | 14.0% |
| Hartley, IA | 1,583 | 35 | 30.0% |
| Elmendorf, TX | 1,583 | 49 | 2.0% |
| Metlakatla, AK | 1,582 | 20 | 60.0% |
| Grayson, CA | 1,582 | 49 | 2.0% |
| Green Valley, CA | 1,583 | 35 | 30.0% |
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