If it was 30 with wind that's cold even for the north. A few years ago I watched a BC-GT doubleheader under those conditions. I kept asking myself why I was there and stayed. Afterwards someone asked if the Georgia people were cold. I responded in those conditions everyone is cold.
I pitched in cold weather through high school. I figured I had an advantage. Pitching kept me warm and loose (relative to the weather).. The hitters were never loose. They spent most of the game standing around in the cold and the wind. Plus the ball didn't propel off the bat as well. As a pitcher if you want to make a position player hate playing jam him in cold weather. The only issue for a pitcher is your team having a long inning at the plate. The best the pitcher can do is walk and jog back and forth in the dugout which annoys everyone.