Here in America, we've had a relatively cold winter. April's temperature measurements were only about average. However, if you look worldwide, it turns out April 2014 was the second-hottest April ever recorded, according to preliminary measurements. This discrepancy is because while some places were only average or below-average in temperature, more places were above-average, some ludicrously so. This fact is brought home in the latest temperature anomaly world map from NASA:
Check out that chunk of planet in eastern Asia. Roughly speaking, eastern Russia, Mongolia, and northeast China were getting absolutely fried last month, pegging the chart's maximum over an area about the size of the whole U.S. Remember that next time someone pulls the old "it's cold where I can see, how about that global warming?!" routine.