Playing in very cold but dry conditions is better than wet conditions imo. The ball bounces unexpectedly due to the glass being a frozen sheet of ice however it atleast bounces.

A freshly opened can of balls helps however you can just toss them in the training basket after 1 session due to them getting soft and soggy.

Playing in the rain requires a different tactic. Balls dont bounce as much. Playing deep lobs are killer during the rain. Hard to look up with rain falling in your eyes and you cant allow it to bounce as it will fall dead after hitting the glass.