▁( Q ) ▁or ▁at ▁least ▁the ▁ 1 2 ▁best ▁perform ers ▁( q ) ▁advance ▁to ▁the ▁Final ▁ ▁Sum mary ▁ ▁Details ▁With ▁qual ifying ▁standard ▁of ▁ 7 4 . 5 0 ▁( Q ) ▁or ▁at ▁least ▁the ▁ 1 2 ▁best ▁perform ers ▁( q ) ▁advance ▁to ▁the ▁Final ▁ ▁Group ▁A ▁ 2 5 ▁July ▁Start ▁time ; ▁ 1 0 : 3 0 ▁ ▁Tem per ature : ▁ 1 6 ° ▁C ▁ ▁Hum id ity : ▁ 6 8 ▁% ▁End ▁time : ▁ 1 1 : 0 9 ▁ ▁Tem per ature : ▁ 2 0 ° ▁C ▁ ▁Hum id ity : ▁ 5 6 ▁% ▁ ▁Group ▁B ▁ 2 5 ▁July ▁Start ▁time ; ▁ 1 1 : 5 9 ▁ ▁Tem per ature : ▁ 2 0 ° ▁C ▁ ▁Hum id ity : ▁ 5 6 ▁% ▁End ▁time : ▁ 1 2 : 4 1 ▁ ▁Tem per ature : ▁ 2 1 ° ▁C ▁ ▁Hum id ity : ▁ 5 3 ▁% ▁ ▁Part icip ation ▁According ▁to ▁an ▁uno fficial ▁count , ▁ 2 6 ▁athlet es ▁from ▁ 1 8 ▁countries ▁participated ▁in ▁the ▁event . ▁ ▁References ▁ ▁Ham mer ▁throw ▁Category : H ammer ▁throw ▁at ▁the ▁World ▁Athletics ▁U 2 0 ▁Championships <0x0A> </s> ▁Walter ▁Henry ▁Er sk ine , ▁Earl ▁of ▁Mar ▁and ▁of ▁K ell ie ▁( 1 7 ▁December ▁ 1 8 3 9 ▁–