Thank goodness you didn't hurt yourself with hot syrup or broken glass. I can only imagine the mess you had to clean up. Temps here tonight are going to be the same as where you are. Not ideal for sap. Sometimes you still get a surprise, but they become few and far between at this time of year. You will start to notice the sap becoming a little more opaque, but still not cloudy. Then one day you look in the bucket and the stuff looks gross and smells a little funky. I think we are only a few days away from gross and funky.