also need this feature, here in the mile high city we still get spring snow that wont come close to freezing the ground and the sprinkler system, but it will blow sprinkler heads apart or at least make a giant icy mess if you attempt to use them.
A temperature setpoint to not turn on the sprinklers would be good enough.
our last spring snow storm the high of the day was 68 degrees @ midnight, then we got 2ft of heavy wet snow fall that was entirely melted within another 48h.. this was in late April when I already had turned on the system to help the grass seed I had planted.