Editing Vallejo, California (section)

== Geography ==
[[File:Napa River in Vallejo.jpg|thumb|left|280px|Aerial view of Vallejo, showing [[San Pablo Bay]] to the center left and the [[Napa River]] dividing mainland Vallejo from [[Mare Island]] in the bottom left.]]
According to [[United States Census Bureau]], the city has a total area of {{convert|49.5|sqmi|km2}}. Land area is {{convert|30.7|sqmi|km2}}, and {{convert|18.9|sqmi|km2}} (38.09%) is water. The [[Napa River]] flows until it changes into the Mare Island Strait in Vallejo which then flows into [[San Pablo Bay]], in the northeastern part of [[San Francisco Bay]].

Vallejo is located on the southwestern edge of [[Solano County, California]] in the [[North Bay (San Francisco Bay Area)|North Bay]] region of the [[San Francisco Bay Area]] in Northern California. Vallejo borders the city of [[Benicia, California|Benicia]] to the east, American Canyon and the Napa county line to the north, the [[Carquinez Strait]] to the south and the [[San Pablo Bay]] to the west.

Several faults have been mapped in the vicinity of Vallejo. The [[San Andreas Fault]] and [[Hayward Fault]]s are the most [[active fault]]s, although the San Andreas is at some distance. Locally, the Sulphur Springs Valley Thrust Fault and Southampton Fault are found. No quaternary seismic activity along these minor faults has been observed with the possible exception of a slight offset revealed by trenching. The Sulphur Mountain and Green Valley faults have been associated with the [[Concord Fault]] to the south. The Concord Fault is considered active. 
[[File:Carquinez Strait aerial view.jpg|thumb|right|The [[Carquinez Bridge]] spans the [[Carquinez Strait]], connecting Vallejo (left) to [[Contra Costa County, California|Contra Costa]] (right).]]
Historically there have been local [[cinnabar]] mines in the Vallejo area.<ref>C.Michael Hogan, Marc Papineau et al., ''Environmental Assessment of the Columbus Parkway Widening between Ascot Parkway and the Northgate Development, Vallejo'', Earth Metrics Inc. Report 7853, California State Clearinghouse, Sept 1989</ref>  The [[Hastings Mine]] and [[St. John's Mine]] contribute ongoing water contamination for [[mercury (element)|mercury]]; furthermore, mine shaft development has depleted much of this area's spring water. Both [[Rindler Creek]] and [[Blue Rock Springs Creek]] have been affected.

=== Climate ===
Vallejo has a mild, coastal [[Mediterranean climate]] and can be an average of {{convert|10|°F|°C|abbr=on}} cooler than nearby inland cities. Vallejo is influenced by its position on the northeastern shore of San Pablo Bay, but is less sheltered from heatwaves than areas directly on or nearer the Pacific Ocean/Golden Gate such as [[San Francisco]] and [[Oakland]]. Although slightly less marine, average temperatures range between {{convert|8|C|F}} in January and {{convert|19.8|C|F}} in July.<ref name="Weatherbase">{{cite web |url= http://www.weatherbase.com/weather/weather.php3?s=470640&cityname=Vallejo-California-United-States-of-America |title=Vallejo, California Temperature Averages |publisher=Weatherbase |access-date=March 5, 2015 |archive-url= https://web.archive.org/web/20150402091549/http://www.weatherbase.com/weather/weather.php3?s=470640&cityname=Vallejo-California-United-States-of-America |archive-date=April 2, 2015 |url-status=live}}</ref> However, summer is very long with June–September being almost equal in historical average temperatures. This [[seasonal lag]] sees October averages being higher than in May<ref name="Weatherbase" /> in spite of it being after the [[Equinox]] (meaning less daylight than darkness).

<!-- Do not change unless you find a new source to link to. -->
{{Weather box|location = Vallejo
|single line = Yes
|Jan record high C = 29.4
|Feb record high C = 30.0
|Mar record high C = 33.3
|Apr record high C = 35.0
|May record high C = 40.0
|Jun record high C = 46.0
|Jul record high C = 44.4
|Aug record high C = 43.3
|Sep record high C = 43.3
|Oct record high C = 41.1
|Nov record high C = 32.2
|Dec record high C = 27.2
|year record high C = 46.0
|Jan high C = 13.9
|Feb high C = 16.4
|Mar high C = 18.4
|Apr high C = 20.9
|May high C = 23.6
|Jun high C = 26.1
|Jul high C = 26.6
|Aug high C = 27.7
|Sep high C = 27.8
|Oct high C = 24.7
|Nov high C = 18.8
|Dec high C = 14.2
|year high C = 21.6
|Jan mean C = 8.7
|Feb mean C = 10.6
|Mar mean C = 11.9
|Apr mean C = 13.7
|May mean C = 16.2
|Jun mean C = 18.7
|Jul mean C = 19.8
|Aug mean C = 19.7
|Sep mean C = 19.3
|Oct mean C = 16.7
|Nov mean C = 12.4
|Dec mean C = 9.0
|year mean C = 14.7
|Jan low C = 3.5
|Feb low C = 4.9
|Mar low C = 5.6
|Apr low C = 6.5
|May low C = 8.7
|Jun low C = 10.7
|Jul low C = 11.9
|Aug low C = 11.7
|Sep low C = 10.8
|Oct low C = 8.8
|Nov low C = 5.9
|Dec low C = 3.8
|year low C = 7.7
|Jan record low C = -7.2
|Feb record low C = -5.0
|Mar record low C = -5.0
|Apr record low C = -2.8
|May record low C = -1.1
|Jun record low C = 1.1
|Jul record low C = 3.3
|Aug record low C = 0.0
|Sep record low C = 2.2
|Oct record low C = -2.2
|Nov record low C = -3.0
|Dec record low C = -10.0
|year record low C = -10.0
|precipitation colour = green
|Jan precipitation mm = 131
|Feb precipitation mm = 112
|Mar precipitation mm = 84
|Apr precipitation mm = 42
|May precipitation mm = 18
|Jun precipitation mm = 5
|Jul precipitation mm = 0
|Aug precipitation mm = 2
|Sep precipitation mm = 8
|Oct precipitation mm = 35
|Nov precipitation mm = 76
|Dec precipitation mm = 116
|year precipitation mm = 627
|Jan precipitation days = 11
|Feb precipitation days = 10
|Mar precipitation days = 9
|Apr precipitation days = 6
|May precipitation days = 3
|Jun precipitation days = 1
|Jul precipitation days = 0
|Aug precipitation days = 0
|Sep precipitation days = 1
|Oct precipitation days = 4
|Nov precipitation days = 8
|Dec precipitation days = 10
|year precipitation days = 63
|source 1 = <ref name="Weatherbase" />
}}