Quarterbacks had their worst completion percentage in a season in 1936, at 27.7 percent.

worst quarterback completion percentage nfl history season
1936QB1934QB1933QB1935QB1932QB1937QB1939QB1940QB1943QB1938QB1950QB1949QB1951QB1942QB1953QB1946QB1952QB1944QB1955QB1947QB1965QB1948QB1941QB27.728.934.235.539.441.142.342.545.245.446.647.447.547.547.847.847.947.948.148.848.949.049.3
POSITIONSEASONGPPCTCMPATTYDSAVGYDS/GTDTD%INTINT%SCKSCKYRATE
Quarterback19363327.723834966.015.067.21012.036.5
Quarterback19342228.911382717.112.337.925.361.2
Quarterback19332634.227795346.820.556.31012.740.2
Quarterback19357435.5651831,0635.814.4105.52212.034.5
Quarterback19322939.428714175.914.434.245.650.0
Quarterback19375341.11022481,5666.329.5176.9156.060.3
Quarterback19395942.31132671,7876.730.3134.9197.151.8
Quarterback19407542.52525933,6966.249.3183.0406.745.5
Quarterback19433945.21763893,3648.686.33910.0348.772.8
Quarterback19387645.41383042,0486.726.9185.9227.257.6
Quarterback195024846.61,7583,76925,2806.7101.91945.12937.853.7
Quarterback194925247.41,4433,04620,0826.679.71585.22277.555.3
Quarterback195123647.51,6233,42023,7997.0100.81835.42487.358.2
Quarterback19425547.51944083,4078.461.9297.14611.360.6
Quarterback195326447.81,9544,09226,9716.6102.21784.32947.253.9
Quarterback194617947.86731,4099,9987.155.9896.31138.059.1
Quarterback195222947.91,5643,26621,9256.795.71735.32256.958.9
Quarterback194410547.93837995,3306.750.8516.4729.053.6
Quarterback195527448.11,8153,77224,9286.691.01734.62546.756.9
Quarterback194726548.81,1372,32817,1647.464.81526.51888.161.6
Quarterback196553348.94,3968,98662,6997.0117.64615.14705.267.2
Quarterback194824549.01,1812,41216,2626.766.41606.61737.263.2
Quarterback19417349.32234523,4467.647.2286.2388.460.6
Quarterback196666249.54,96010,01268,6756.9103.74754.75265.365.9
Quarterback196055849.63,7647,58952,4786.994.03895.14746.263.3
StatMuse has season-level data for completion percentage going back to the 1932 season.

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