I think it was the case 10+ years ago when verts were the cold, drafty choice but modern cars with multi-layer roofs, decent climate control, seat heaters, air scarfs etc - verts are usable all year round.
Mowflow, didn't know you'd sold - have you replaced it yet?
Gone but not forgotten:
325i M Sport (E92), Black Sapphire, Coral Red Dakota, 19" 225's, Seat Heating, 6FL and de-badge
Replaced by 6.2 litres of AMG powered C class.