| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 59°F | 50°F | 2.8" |
| February | 45°F | 62°F | 53°F | 3.1" |
| March | 47°F | 65°F | 55°F | 2.9" |
| April | 49°F | 67°F | 57°F | 1.8" |
| May | 52°F | 69°F | 59°F | 0.4" |
| June | 54°F | 72°F | 62°F | 0.3" |
| July | 56°F | 73°F | 63°F | 0.0" |
| August | 57°F | 73°F | 63°F | 0.0" |
| September | 55°F | 76°F | 64°F | 0.1" |
| October | 52°F | 73°F | 61°F | 1.0" |
| November | 47°F | 65°F | 56°F | 1.9" |
| December | 42°F | 59°F | 50°F | 4.1" |
| Index | Larkspur | 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. |
| North Richmond, CA | 4,258 | 40 | 20.0% |
| San Pablo, CA | 30,959 | 40 | 20.0% |
| Lucas Valley-Marinwood, CA | 6,738 | 40 | 20.0% |
| San Anselmo, CA | 12,623 | 40 | 20.0% |
| Sleepy Hollow, CA | 2,366 | 40 | 20.0% |
| Larkspur, CA | 12,363 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Lakeland Village, CA | 12,362 | 89 | 78.0% |
| Urbana, MD | 12,362 | 40 | 20.0% |
| Fairfax Station, VA | 12,364 | 47 | 6.0% |
| Winnetka, IL | 12,361 | 55 | 10.0% |
| Wellesley, ON | 12,358 | n/a | |
| Larkspur, CA | 12,363 | 40 | 20.0% |
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