| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 63°F | 50°F | 3.5" |
| February | 42°F | 64°F | 52°F | 2.9" |
| March | 44°F | 65°F | 53°F | 3.5" |
| April | 45°F | 68°F | 55°F | 1.6" |
| May | 48°F | 70°F | 57°F | 0.3" |
| June | 51°F | 73°F | 60°F | 0.2" |
| July | 54°F | 73°F | 61°F | 0.0" |
| August | 54°F | 73°F | 62°F | 0.0" |
| September | 53°F | 76°F | 62°F | 0.1" |
| October | 50°F | 75°F | 60°F | 0.9" |
| November | 44°F | 68°F | 54°F | 1.7" |
| December | 39°F | 62°F | 49°F | 3.6" |
| Index | Scotts Valley | California | National |
| Air quality index | 35 | 55 | 42 |
| Pollution index | 5,429,550 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 347 |
| Days with moderate air quality | 18 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.050% |
| Mercury | 0.150% |
| City | Population | Air Quality Index | National Avg. |
| Ben Lomond, CA | 7,378 | 35 | 30.0% |
| Day Valley, CA | 3,414 | 35 | 30.0% |
| Live Oak, CA | 8,794 | 35 | 30.0% |
| Paradise Park, CA | 468 | 35 | 30.0% |
| Santa Cruz, CA | 65,011 | 35 | 30.0% |
| Scotts Valley, CA | 12,055 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Festus, MO | 12,054 | 54 | 8.0% |
| Londonderry, NH | 12,053 | 37 | 26.0% |
| Cheval, FL | 12,052 | 43 | 14.0% |
| Enumclaw, WA | 12,062 | 45 | 10.0% |
| Overlea, MD | 12,063 | 46 | 8.0% |
| Scotts Valley, CA | 12,055 | 35 | 30.0% |
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