(In fact, Marquette, Mich. reported low temperatures below zero on Wednesday morning. Yes, April 16th!!!)
For just the 30 day May forecast, forecasts paint a moderately strong signal that the month will be warmer than average, and a fairly decent signal that it will also be drier than average.
(Key: Brown is warmer than average, blue is cooler than average on the temperature map. For rainfall, brown means drier than normal while green means higher odds of wetter than normal conditions.)