| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 44°F | 58°F | 51°F | 3.2" |
| February | 46°F | 62°F | 53°F | 3.4" |
| March | 47°F | 64°F | 54°F | 2.7" |
| April | 49°F | 67°F | 56°F | 1.7" |
| May | 51°F | 69°F | 58°F | 0.3" |
| June | 54°F | 72°F | 61°F | 0.2" |
| July | 56°F | 73°F | 62°F | 0.0" |
| August | 56°F | 73°F | 62°F | 0.0" |
| September | 56°F | 76°F | 63°F | 0.1" |
| October | 54°F | 73°F | 62°F | 1.0" |
| November | 49°F | 65°F | 56°F | 1.7" |
| December | 44°F | 58°F | 51°F | 4.4" |
| Index | Daly City | California | National |
| Air quality index | 40 | 55 | 42 |
| Pollution index | 8,232,360 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 290 |
| Days with moderate air quality | 74 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Emeryville, CA | 12,131 | 40 | 20.0% |
| Alto, CA | 841 | 40 | 20.0% |
| Mill Valley, CA | 14,823 | 40 | 20.0% |
| Strawberry, CA | 5,466 | 40 | 20.0% |
| Albany, CA | 20,944 | 40 | 20.0% |
| Daly City, CA | 111,327 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Hillsboro, OR | 111,390 | 38 | 24.0% |
| Thunder Bay, ON | 111,499 | n/a | |
| San Buenaventura (Ventura), CA | 111,548 | 46 | 8.0% |
| Lewisville, TX | 111,065 | 51 | 2.0% |
| Sandy Springs, GA | 111,012 | 52 | 4.0% |
| Daly City, CA | 111,327 | 40 | 20.0% |