Weather stats are composites of every day they have records for.
Rare occurrences of weather patterns are normal. Today is normal, it was normal two years ago when Lake Michigan froze over, it was normal when the ice caps were melting, it was normal now that they're on the way back, it's normal every day.
Enjoy the weather today, it's the only weather you have........and like they say, if you don't like it, just wait a while..........
It would be interesting to see what the mean average of world temps have been over the centuries.