Babe Ruth has the best wOBA in a season, with a wOBA of .597 in 1920.

who has the highest weighted on base percentage in a season
Interpreted as:
Who has the highest weighted on base percentage with a minimum of 3.1 PA per team game in a season?
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1920Ruth1921Ruth1923Ruth1941Williams1926Ruth1924Ruth1927Ruth2002Bonds1925Hornsby1927Gehrig1924Hornsby2004Bonds2001Bonds1894Duffy1931Ruth1946Williams1887O'Neill1957Williams1942Williams1932Foxx1922Hornsby1930Ruth.597.575.571.568.551.549.545.544.540.540.537.537.537.526.525.525.525.524.524.522.520.517
NAMESEASONTMGWOBAABRH2B3BHRRBISHSFSBCSBBIBBHBPSOGIDPPATBXBHAVGOBPSLGOPSWRCWRC+WRAABRAA
Babe RuthBabe Ruth1920
NYYNYY
142.597458158172369541355141415038061638899.376.532.8471.379191237120.9110.5
Babe RuthBabe Ruth1921
NYYNYY
152.57554017720444165916841713145481693457119.378.512.8461.359214224127.8118.7
Babe RuthBabe Ruth1923
NYYNYY
152.5715221512054513411303172117049369939999.393.545.7641.309211230124.7120.4
Ted WilliamsTed Williams1941
BSABSA
143.568456135185333371200241473271060633573.406.553.7351.287179221108.896.9
Babe RuthBabe Ruth1926
NYYNYY
152.551495139184305471531011914437665236582.372.516.7371.253184216105.6100.6
Babe RuthBabe Ruth1924
NYYNYY
153.54952914320039746124691314248168139192.378.513.7391.252193210109.2102
Babe RuthBabe Ruth1927
NYYNYY
151.54554015819229860165147613708969141797.356.486.7721.258195212109.9104.8
Barry BondsBarry Bonds2002
SFGSFG
143.54440311714931246110029219868947461232279.370.582.7991.381183244110109.9
Rogers HornsbyRogers Hornsby1925
SLNSLN
138.54050413320341103914316538323960538190.403.489.7561.24517320894.190.1
Lou GehrigLou Gehrig1927
NYYNYY
155.54058414921852184717321108109384717447117.373.474.7651.240199209110.9105.6
Rogers HornsbyRogers Hornsby1924
SLNSLN
143.53753612122743142594135128923264037382.424.507.6961.20317522196.795.9
Barry BondsBarry Bonds2004
SFGSFG
147.537373129135273451010361232120941561730375.362.609.8121.422185233108105.7
Barry BondsBarry Bonds2001
SFGSFG
153.5374761291563227313702133177359935664411107.328.515.8631.379200234117.7116.6
Hugh DuffyHugh Duffy1894
BSNBSN
125.52653916023751161814510486611561637485.440.502.6941.19620316991.380.7
Babe RuthBabe Ruth1931
NYYNYY
145.5255341491993134616205412815166337480.373.495.7001.19518120698.695.1
Ted WilliamsTed Williams1946
BSABSA
150.525514142176378381230001562441267234383.342.497.6671.16416621495.887.5
Tip O'NeillTip O'Neill1887
STL
124.525517167225521914123305052057235785.435.490.6911.18019119096.488.9
Ted WilliamsTed Williams1957
BOSBOS
132.5244209616328138870201119335431154630767.388.526.7311.25714822387.379
Ted WilliamsTed Williams1942
BSABSA
150.524522141186345361370321454511267133875.356.499.6481.14716820996.286.5
Jimmie FoxxJimmie Foxx1932
PHAPHA
154.52258515121333958169037116096701438100.364.469.7491.218193198105.695.8
Rogers HornsbyRogers Hornsby1922
SLNSLN
154.52062314125046144215215171265150704450102.401.459.7221.18118619797.892.7
Babe RuthBabe Ruth1930
NYYNYY
145.5175181501862894915321101013616167637986.359.493.7321.22519220497100.6
Lou GehrigLou Gehrig1936
NYYNYY
155.5125791672053774915233413074671940393.354.478.6961.17419217897.685.8
Stan MusialStan Musial1948
SLNSLN
155.512611135230461839131177933418694429103.376.450.7021.15217420192.386.4
Lou GehrigLou Gehrig1934
NYYNYY
154.5115791282104064916609510923169040995.363.465.7061.17218219494.890.9