November has 30 days, December has 31 days, January has 31 days and February has 28 days for a total of 30+31+31+28 = <<30+31+31+28=120>>120 days
He burns 5 pieces of wood every day so 120*5 = <<120*5=600>>600 pieces of wood
Every tree he cuts down supplies 75 pieces of firewood and he will burn 600 pieces so he needs 600/75 = <<600/75=8>>8 trees
#### 8