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| 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. |
| Brisbane, CA | 4,645 | 40 | 20.0% |
| Oakland, CA | 422,575 | 40 | 20.0% |
| South San Francisco, CA | 66,878 | 40 | 20.0% |
| Marin City, CA | 3,040 | 40 | 20.0% |
| Stinson Beach, CA | 583 | 40 | 20.0% |
| Daly City, CA | 107,197 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Highlands Ranch, CO | 107,017 | 58 | 16.0% |
| Greeley, CO | 107,445 | 45 | 10.0% |
| Lewisville, TX | 107,740 | 51 | 2.0% |
| Jurupa Valley, CA | 106,646 | 89 | 78.0% |
| Meridian, ID | 107,787 | 36 | 28.0% |
| Daly City, CA | 107,197 | 40 | 20.0% |
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