Whats up with the weather

I just finished watching the weather, and we are supposed to get a mix of rain and snow on Friday night/Saturday morning.  What is going on???  It was 70 degrees last weekend and now it is going to snow?  When we moved down here to Peoria, someone, whose name will not be revealed, (mom), said that Illinois does not get much snow and it is warmer here than in Iowa.  Well, we have experienced a lot of snow, and now they are talking about snow in April. I just don't understand.  We want the nice weather we had last weekend.