I exaggerate a bit in saying that but our warmth in March was muted out quite a bit globally by aggressive cold in East Asia and Alaska.
In April, warmth was centered in the Midwest and Plains States in the US but it was also much, much warmer than average in Central Asia as a strong upper level ridge built in and controlled the weather. The only significant cooling of note was across the Southern Hemisphere, specifically in Patagonia and in the southern quarter of Africa as their cold season got off to an early start.
The warmth in the Northern Hemisphere, not surprisingly, coincided with a shortfall in snowfall compared to average as well. Snowcover in April 2012 was the fourth lowest since records were first kept in 1967 and has been part of an overall trend in recent years where snow cover has melted in North America and the Northern Hemisphere in quicker succession compared to average.