According to "Google"; Over the past 50 years, the average global temperature has increased at the fastest rate in recorded history. And experts see the trend is accelerating: All but one of the 16 hottest years in NASA’s 134-year record have occurred since 2000.
I really didn't need to look that up, from my own experience here in St. Louis I know that's true; 6 below zero was common in the middle of January, but now it just gets below freezing.