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 | Half Moon Bay | California | National |
Air quality index | 43 | 55 | 50 |
Pollution index | 9,645,610 | 18,106,726 | 5,066,862 |
Measurement | Total |
Days measured | 365 |
Days with good air quality | 263 |
Days with moderate air quality | 98 |
Days w/ poor A.Q. for sensitive groups | 4 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.140% |
Benzene | 0.070% |
Carbon Tetrachloride | 0.000% |
Lead | 0.100% |
Mercury | 0.020% |
City, State | Population | Air Quality Index | National Avg. |
Loma Mar, CA | 150 | 35 | 30% |
Brisbane, CA | 4,568 | 40 | 20% |
South San Francisco, CA | 66,587 | 40 | 20% |
Colma, CA | 1,540 | 40 | 20% |
Emerald Lake Hills, CA | 4,716 | 43 | 14% |
Half Moon Bay, CA | 12,281 | 43 | 14% |
City, State | Population | Air Quality Index | National Avg. |
Finneytown, OH | 12,279 | 54 | 8% |
Winfield, KS | 12,283 | 40 | 20% |
Rogers, MN | 12,284 | 46 | 8% |
Okmulgee, OK | 12,284 | 5 | 90% |
Portales, NM | 12,275 | 15 | 70% |
Half Moon Bay, CA | 12,281 | 43 | 14% |