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Half Moon Bay Environment Facts

Air Quality, Water Quality, Climate and more


Half Moon Bay
Air Quality
San Mateo County
. 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
. % 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)
. . 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
. 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)
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)
. . 99 City Avg
Total Degree Days 3,765 5,915
HDD 3,754 4,662
CDD 11 1,253



EPA Hazardous Material Cleanup Sites
(Half Moon Bay Area)
Half Moon Bay Area EPA Cleanup Sites


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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