I think you mean the "Landing Climb Limit Weight" graph which is not just for an autoland. The exact figures depend upon series & engine rating but for a 20K 737-300 the wording is:
"If operating in icing conditions during any part of the flight when the forecast landing temperature is 8C reduce the flap 40 climb limit weight by 4670kg or the flap 30 climb limit weight by 4360kg or the flap 15 climb limit weight by 4170kg."
Ref FPPM 1.3.7
S&L