LeBron James had his best three-point percentage in a season in 2012-13, at 40.6 percent.

lebron james highest 3pt% in a season
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2012-13James2013-14James2017-18James2020-21James2016-17James2011-12James2021-22James2014-15James2004-05James2019-20James2008-09James2018-19James2005-06James2009-10James2010-11James2006-07James2007-08James2015-16James2003-04James40.637.936.736.536.336.236.235.435.134.834.433.933.533.333.031.931.530.929.0
NAMESEASONTMGP3P%MPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PAFTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
LeBron JamesLeBron James2012-13MIAMIA7640.637.926.88.07.31.70.93.010.117.856.51.43.35.37.075.32,8772,03661055112967226110+720
LeBron JamesLeBron James2013-14MIAMIA7737.937.727.16.96.31.60.33.510.017.656.71.54.05.77.675.02,9022,08953348812126270126+410
LeBron JamesLeBron James2017-18CLECLE8236.736.927.58.69.11.40.94.210.519.354.21.85.04.76.573.13,0262,25170974711671347136+104
LeBron JamesLeBron James2020-21LALLAL4536.533.425.07.77.81.10.63.79.418.351.32.36.34.05.769.81,5041,126346350482516870+287
LeBron JamesLeBron James2016-17CLECLE7436.337.826.48.68.71.20.64.19.918.254.81.74.64.87.267.42,7951,9546396469244303134+483
LeBron JamesLeBron James2011-12MIAMIA6236.237.527.17.96.21.90.83.410.018.953.10.92.46.28.177.12,3261,6834923871155021396+473
LeBron JamesLeBron James2021-22LALLAL3136.236.728.97.56.51.61.23.210.820.851.92.97.94.55.876.71,13789723220050369870-3
LeBron JamesLeBron James2014-15CLECLE6935.436.125.36.07.41.60.73.99.018.548.81.74.95.47.771.02,4931,74341651110949272135+539
LeBron JamesLeBron James2004-05CLECLE8035.142.427.27.47.22.20.73.39.921.147.21.43.96.08.075.03,3882,17558857717752262146+152
LeBron JamesLeBron James2019-20LALLAL6734.834.625.37.810.21.20.53.99.619.449.32.26.33.95.769.32,3161,6985256847836261118+441
LeBron JamesLeBron James2008-09CLECLE8134.437.728.47.67.21.71.13.09.719.948.91.64.77.39.478.03,0542,30461358713793241139+870
LeBron JamesLeBron James2018-19LALLAL5533.935.227.48.58.31.30.63.610.119.951.02.05.95.17.666.51,9371,505465454723319794+115
LeBron JamesLeBron James2005-06CLECLE7933.542.531.47.06.61.60.83.311.123.148.01.64.87.610.373.83,3612,47855652112366260181+275
LeBron JamesLeBron James2009-10CLECLE7633.339.029.77.38.61.61.03.410.120.150.31.75.17.810.276.72,9662,25855465112577261119+648
LeBron JamesLeBron James2010-11MIAMIA7933.038.826.77.57.01.60.63.69.618.851.01.23.56.48.475.93,0632,11159055412450284163+619
LeBron JamesLeBron James2006-07CLECLE7831.940.927.36.76.01.60.73.29.920.847.61.34.06.39.069.83,1902,13252647012555250171+377
LeBron JamesLeBron James2007-08CLECLE7531.540.430.07.97.21.81.13.410.621.948.41.54.87.310.371.23,0272,25059253913881255165+139
LeBron JamesLeBron James2015-16CLECLE7630.935.625.37.46.81.40.63.39.718.652.01.13.74.76.573.12,7091,92056551410449249143+618
LeBron JamesLeBron James2003-04CLECLE7929.039.520.95.55.91.60.73.57.918.941.70.82.74.45.875.43,1221,65443246513058273149-144
StatMuse has season-level data for three-point percentage going back to the 1979-80 season.