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| Half Moon Bay Air Quality San Mateo County |
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| . | Good Days | Moderate Days | Unhealthy for Sensitive Persons Days | Unhealthy Days | Very Unhealthy Days |
| 2017 | 294 | 64 | 4 | 3 | 0 |
| 2016 | 302 | 63 | 0 | 0 | 0 |
| 2015 | 327 | 37 | 1 | 0 | 0 |
| 2014 | 321 | 44 | 0 | 0 | 0 |
| 2013 | 261 | 101 | 3 | 0 | 0 |
| Half Moon Bay Water Quality San Francisco Coastal South Watershed |
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| . | % Good | % Threatened | % Impaired |
| 2014 | na | na | na |
| 2012 | 0 | 0 | 100 |
| 2010 | na | na | na |
| 2008 | na | na | na |
| 2006 | na | na | na |
| 2004 | 8 | 13 | 79 |
| 2002 | 8 | 13 | 79 |
| Half Moon Bay Recreation |
||
| . | # of Parks | # of Parks (99 City Avg) |
| National Parks, Historic Sites, etc. (managed by National Park Service) |
Alcatraz Island, Golden Gate National Recreation Area plus 13 more | 7 |
| National Campgrounds, Lodges, etc. (other federal agency-managed sites) |
3 | 26 |
| State Parks, Sites, etc. | 63 | 11 |
| Half Moon Bay Climate (1971-2000) |
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| . | . | 99 City Avg | January - Avg Low Temp | 43 F | 27 F |
| January - Avg Daily Temp | 51 F | 37 F |
| July - Avg Daily Temp | 58 F | 74 F |
| July - Avg High Temp | 65 F | 86 F |
| Avg Annual Precipitation | 28 in | 35 in |
| Half Moon Bay Elevation | |
| 16 feet | GPTR 99 City Average 1,652 feet |
| Half Moon Bay Natural Hazards |
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| . | Risk Level | 99 City Average |
| Total Hazard Risk | Higher | Moderate |
| Earthquake | 80% | 10.9% |
| Tsunami | Risk | No Risk |
| Hurricane | 0 | 10 |
| Flood | Very High | Very High |
| Tornado | Very Low | Low |
| Volcano | Low Ash Fall | No Risk |
| Wildfire | Low | Low |
| Half Moon Bay Man-Made Hazards (Nuclear) |
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| Nuclear Power Stations (# Reactors) |
Distance from City | GPTR 99 City Average |
| Diablo Canyon (2) | 170 miles | 50% of cities are within 100 miles of at least one nuclear station |
| Half Moon Bay Heating and Cooling Degree Days (avg annual) |
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| . | . | 99 City Avg |
| Total Degree Days | 3,765 | 5,915 |
| HDD | 3,754 | 4,662 |
| CDD | 11 | 1,253 |
Legend: Small green circles (older style maps) or multi-colored circles (newer style maps: click here for legend) indicate 1)Superfund Sites 2)Federal Facilities 3)RCRA Corrective Action Sites and 4)Brownfields Properties (EPA hazardous material cleanup sites defined at Environment link)
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| Napa is also Wine Country | Newport Beach has Similar Geography & Climate | Video Tours for California Retirement Cities | See more photos for Half Moon Bay |
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