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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 59°F | 47°F | 2.6" |
| February | 41°F | 63°F | 51°F | 2.6" |
| March | 43°F | 67°F | 54°F | 2.1" |
| April | 45°F | 72°F | 57°F | 1.4" |
| May | 50°F | 78°F | 62°F | 0.3" |
| June | 54°F | 85°F | 67°F | 0.2" |
| July | 58°F | 90°F | 71°F | 0.0" |
| August | 57°F | 89°F | 70°F | 0.0" |
| September | 56°F | 88°F | 69°F | 0.1" |
| October | 50°F | 79°F | 63°F | 0.9" |
| November | 43°F | 67°F | 54°F | 1.5" |
| December | 38°F | 60°F | 48°F | 2.8" |
| Index | Sunol | California | National |
| Air quality index | 43 | 55 | 42 |
| Pollution index | 6,427,290 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 263 |
| Days with moderate air quality | 98 |
| Days w/ poor A.Q. for sensitive groups | 4 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.110% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Ashland, CA | 23,566 | 40 | 20.0% |
| San Lorenzo, CA | 30,117 | 40 | 20.0% |
| Camino Tassajara, CA | 5,870 | 40 | 20.0% |
| San Ramon, CA | 81,344 | 40 | 20.0% |
| Castro Valley, CA | 64,392 | 40 | 20.0% |
| Sunol, CA | 835 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Hennepin, IL | 835 | 0 | 100.0% |
| Mendon, MI | 835 | 38 | 24.0% |
| Wanblee, SD | 835 | 44 | 12.0% |
| Lake Nebagamon, WI | 835 | 35 | 30.0% |
| Lone Rock, WI | 835 | 35 | 30.0% |
| Sunol, CA | 835 | 43 | 14.0% |
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