| 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 | 50 |
| 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, State | Population | Air Quality Index | National Avg. |
| Kensington, CA | 5,602 | 40 | 20% |
| Richmond, CA | 108,303 | 40 | 20% |
| Fairfax, CA | 7,598 | 40 | 20% |
| Novato, CA | 54,790 | 40 | 20% |
| San Rafael, CA | 58,948 | 40 | 20% |
| Larkspur, CA | 12,268 | 40 | 20% |
| City, State | Population | Air Quality Index | National Avg. |
| New Baltimore, MI | 12,266 | 56 | 12% |
| Wilton Manors, FL | 12,270 | 41 | 18% |
| Newington Forest, VA | 12,262 | 47 | 6% |
| Ocean Pointe, HI | 12,274 | 30 | 40% |
| Portales, NM | 12,275 | 15 | 70% |
| Larkspur, CA | 12,268 | 40 | 20% |
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