Editing Alameda County, California (section)

==Geography and climate==
[[File:Oaklandatnight02192006.JPG|thumb|View of [[downtown Oakland]] looking west across [[Lake Merritt]]]]
[[File:BerkeleyAndBayAtNight.jpg|thumb|View of Berkeley and the San Francisco Bay at nightfall]]
[[File:Mission-SJ.jpg|thumb|175px|The reconstructed mission at [[Mission San José (California)|Mission San José]] (located in Fremont)]]

According to the [[U.S. Census Bureau]], the county has a total area of {{convert|821|sqmi}}, of which {{convert|739|sqmi}} is land and {{convert|82|sqmi}} (10%) is water.<ref name="GR1">{{cite web|url=http://www2.census.gov/geo/docs/maps-data/data/gazetteer/counties_list_06.txt|publisher=United States Census Bureau|access-date=September 24, 2015|date=August 22, 2012|title=2010 Census Gazetteer Files}}</ref> The [[San Francisco Bay]] borders the county on the west.

The crest of the [[Berkeley Hills]] forms part of the northeastern boundary and reaches into the center of the county. A coastal plain several miles wide lines the bay; and is Oakland's most populous region. Livermore Valley lies in the eastern part of the county. Amador Valley abuts the western edge of Livermore Valley and continues west to the Pleasanton Ridge. The ridges and valleys of the [[Diablo Range]], containing the county's highest peaks, cover the very sparsely populated southeast portion of the county.

The [[Hayward Fault]], a major branch of the San Andreas Fault to the west, runs through the most populated parts of Alameda County, while the [[Calaveras Fault]] runs through the southeastern part of the county.

The areas near the Bay itself have a maritime [[warm-summer Mediterranean climate]], whereas behind the mountains, summers are significantly warmer. The climate charts below are for [[Oakland, California|Oakland]] and inland [[Livermore, California|Livermore]].

{{Weather box
|location = Oakland Museum (1981–2010 normals, extremes 1970–present)
|single line = Y
|width = auto
| Jan record high F  = 78
| Feb record high F  = 82
| Mar record high F  = 88
| Apr record high F  = 97
| May record high F  = 105
| Jun record high F  = 106
| Jul record high F  = 103
| Aug record high F  = 99
| Sep record high F  = 109
| Oct record high F  = 103
| Nov record high F  = 84
| Dec record high F  = 75
| year record high F = 109
| Jan avg record high F  = 67.0
| Feb avg record high F  = 72.4
| Mar avg record high F  = 75.9
| Apr avg record high F  = 82.8
| May avg record high F  = 85.5
| Jun avg record high F  = 89.1
| Jul avg record high F  = 87.3
| Aug avg record high F  = 88.7
| Sep avg record high F  = 89.7
| Oct avg record high F  = 87.8
| Nov avg record high F  = 75.8
| Dec avg record high F  = 66.5
| year avg record high F = 94.7
| Jan high F  = 58.0
| Feb high F  = 61.8
| Mar high F  = 63.6
| Apr high F  = 66.0
| May high F  = 68.8
| Jun high F  = 71.2
| Jul high F  = 71.7
| Aug high F  = 73.0
| Sep high F  = 74.1
| Oct high F  = 71.7
| Nov high F  = 64.6
| Dec high F  = 58.1
| year high F = 66.6
| Jan mean F  = 51.4
| Feb mean F  = 54.7
| Mar mean F  = 56.4
| Apr mean F  = 58.3
| May mean F  = 61.1
| Jun mean F  = 63.5
| Jul mean F  = 64.3
| Aug mean F  = 65.6
| Sep mean F  = 66.0
| Oct mean F  = 63.3
| Nov mean F  = 57.1
| Dec mean F  = 51.8
| year mean F = 59.2
| Jan low F  = 44.7
| Feb low F  = 47.7
| Mar low F  = 49.1
| Apr low F  = 50.5
| May low F  = 53.5
| Jun low F  = 55.7
| Jul low F  = 56.9
| Aug low F  = 58.1
| Sep low F  = 57.8
| Oct low F  = 55.1
| Nov low F  = 49.8
| Dec low F  = 45.4
| year low F = 51.9
| Jan avg record low F  = 38.0
| Feb avg record low F  = 40.0
| Mar avg record low F  = 42.2
| Apr avg record low F  = 45.2
| May avg record low F  = 49.1
| Jun avg record low F  = 51.9
| Jul avg record low F  = 54.0
| Aug avg record low F  = 55.5
| Sep avg record low F  = 53.8
| Oct avg record low F  = 49.0
| Nov avg record low F  = 41.6
| Dec avg record low F  = 37.3
| year avg record low F = 36.0
| Jan record low F  = 30
| Feb record low F  = 29
| Mar record low F  = 34
| Apr record low F  = 37
| May record low F  = 43
| Jun record low F  = 48
| Jul record low F  = 51
| Aug record low F  = 50
| Sep record low F  = 48
| Oct record low F  = 43
| Nov record low F  = 36
| Dec record low F  = 26
| year record low F = 26
| precipitation colour    = green
| Jan precipitation inch  = 4.59
| Feb precipitation inch  = 4.65
| Mar precipitation inch  = 3.52
| Apr precipitation inch  = 1.32
| May precipitation inch  = 0.73
| Jun precipitation inch  = 0.12
| Jul precipitation inch  = 0.00
| Aug precipitation inch  = 0.07
| Sep precipitation inch  = 0.23
| Oct precipitation inch  = 1.29
| Nov precipitation inch  = 3.07
| Dec precipitation inch  = 4.44
| year precipitation inch = 24.09
| unit precipitation days = 0.01 in.
| Jan precipitation days  = 10.2
| Feb precipitation days  = 10.5
| Mar precipitation days  = 10.7
| Apr precipitation days  = 5.9
| May precipitation days  = 3.4
| Jun precipitation days  = 1.0
| Jul precipitation days  = 0.1
| Aug precipitation days  = 0.4
| Sep precipitation days  = 1.2
| Oct precipitation days  = 3.5
| Nov precipitation days  = 8.1
| Dec precipitation days  = 10.4
| year precipitation days = 69.1
|source 1 = NOAA<ref name= NCDC >{{cite web|url = https://w2.weather.gov/climate/xmacis.php?wfo=mtr|title = NowData – NOAA Online Weather Data|publisher = [[National Oceanic and Atmospheric Administration]]|access-date = September 29, 2015}}</ref><ref name=NOAAtxt>{{cite web|url = ftp://ftp.ncdc.noaa.gov/pub/data/normals/1981-2010/products/station/USC00046336.normals.txt|title = CA Oakland Museum|publisher = [[National Oceanic and Atmospheric Administration]]|access-date = September 29, 2015}}</ref>
}}

{{Weather box
|collapsed = Y
|location = Livermore, California (1903–2013)
|single line = Y
|width = auto
|Jan record high F = 77
|Feb record high F = 80
|Mar record high F = 88
|Apr record high F = 96
|May record high F = 108
|Jun record high F = 113
|Jul record high F = 113
|Aug record high F = 112
|Sep record high F = 115
|Oct record high F = 106
|Nov record high F = 93
|Dec record high F = 79
|year record high F= 113
|Jan high F = 56.8
|Feb high F = 61.2
|Mar high F = 65.2
|Apr high F = 70.5
|May high F = 76.4
|Jun high F = 83.1
|Jul high F = 89.0
|Aug high F = 88.2
|Sep high F = 86.0
|Oct high F = 77.7
|Nov high F = 66.3
|Dec high F = 57.5
|year high F = 73.2
|Jan low F = 36.7
|Feb low F = 39.4
|Mar low F = 41.3
|Apr low F = 43.6
|May low F = 47.6
|Jun low F = 51.7
|Jul low F = 54.2
|Aug low F = 54.0
|Sep low F = 52.5
|Oct low F = 47.7
|Nov low F = 41.1
|Dec low F = 37.0
|year low F = 45.6
|Jan avg record high F=66.9
|Feb avg record high F=71.4
|Mar avg record high F=77.9
|Apr avg record high F=85.8
|May avg record high F=94.3
|Jun avg record high F=102.0
|Jul avg record high F=104.3
|Aug avg record high F=102.8
|Sep avg record high F=101.2
|Oct avg record high F=92.6
|Nov avg record high F=79.0
|Dec avg record high F=67.8
|year avg record high F=106.3
|Jan avg record low F=26.4 
|Feb avg record low F=29.5
|Mar avg record low F=32.1
|Apr avg record low F=34.9
|May avg record low F=39.3
|Jun avg record low F=44.4
|Jul avg record low F=47.7
|Aug avg record low F=47.8
|Sep avg record low F=44.5
|Oct avg record low F=38.3
|Nov avg record low F=30.5
|Dec avg record low F=26.7
|year avg record low F=24.5
|Jan record low F = 18
|Feb record low F = 21
|Mar record low F = 22
|Apr record low F = 29
|May record low F = 32
|Jun record low F = 38
|Jul record low F = 36
|Aug record low F = 36
|Sep record low F = 35
|Oct record low F = 29
|Nov record low F = 22
|Dec record low F = 18
|year record low F= 18
|Jan precipitation inch = 2.97
|Feb precipitation inch = 2.47
|Mar precipitation inch = 2.15
|Apr precipitation inch = 1.00
|May precipitation inch = .44
|Jun precipitation inch = .11
|Jul precipitation inch = .02
|Aug precipitation inch = .04
|Sep precipitation inch = .22
|Oct precipitation inch = .67
|Nov precipitation inch = 1.54
|Dec precipitation inch = 2.56
|unit precipitation days = .01 in
|Jan precipitation days = 10
|Feb precipitation days = 9
|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 = 3
|Nov precipitation days = 7
|Dec precipitation days = 9
|year rain days = 58
| Jan snow days  =trace
| Feb snow days  =0.0
| Mar snow days  =0.0
| Apr snow days  =0.0
| May snow days  =0.0
| Jun snow days  =0.0
| Jul snow days  =0.0
| Aug snow days  =0.0
| Sep snow days  =0.0
| Oct snow days  =0.0
| Nov snow days  =0.0
| Dec snow days  =0.1

|precipitation colour = green
|source 1 = WRCC<ref name=WRCC>{{cite web|url=http://www.wrcc.dri.edu/cgi-bin/cliMAIN.pl?ca4997|title=LIVERMORE, CALIFORNIA – Climate Summary|website=www.wrcc.dri.edu|access-date=June 5, 2018}}</ref> and pogodaiklimat.ru<ref>{{cite web|url=http://www.pogodaiklimat.ru/climate3/KLVK.htm|title=Климат Ливермора – Погода и климат|website=www.pogodaiklimat.ru|access-date=June 20, 2019}}</ref>
}}

===Adjacent counties===
The City and County of [[San Francisco, California]], borders the county on the west, and has a small land border with the city of [[Alameda, California]] due to land filling.<ref>{{cite news|url=https://www.kqed.org/news/11702058/why-is-part-of-alameda-island-in-san-francisco|title=Why Is Part of Alameda Island in San Francisco?|publisher=KQED|date=November 1, 2018}}</ref>

[[Santa Clara County, California|Santa Clara County]] borders the county on the south.

[[San Joaquin County, California|San Joaquin County]] borders the county on the east.

[[Contra Costa County, California|Contra Costa County]] borders the county on the north.

[[Stanislaus County, California|Stanislaus County]] borders the county on the easternmost end of its southern boundary for {{convert|250|ft|m}}.<ref>{{cite web|url=https://viewer.nationalmap.gov/advanced-viewer/|title = The National Map - Advanced Viewer}}</ref>

===National protected area===
* [[Don Edwards San Francisco Bay National Wildlife Refuge]] (part)