| 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 | Colma | 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. |
| Muir Beach, CA | 360 | 40 | 20.0% |
| Tamalpais-Homestead Valley, CA | 12,331 | 40 | 20.0% |
| Alameda, CA | 79,827 | 40 | 20.0% |
| Emeryville, CA | 11,679 | 40 | 20.0% |
| Oakland, CA | 422,575 | 40 | 20.0% |
| Colma, CA | 1,492 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Wilson, WY | 1,492 | 43 | 14.0% |
| Brudenell, Lyndoch and Raglan, ON | 1,492 | n/a | |
| Laird No. 404, SK | 1,492 | n/a | |
| Pierson, FL | 1,491 | 31 | 38.0% |
| Bedford, IA | 1,493 | 43 | 14.0% |
| Colma, CA | 1,492 | 40 | 20.0% |
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