April has featured 33 days of 90 plus temperatures. It's not unusual for April to get hot...rare, yes, but it isn't unusual in the sense that every few years the region gets a chance to bake with a stretch of heat. It is rare to get an April heat wave -- it's only occurred five times since 1874 in Philadelphia, last occurring in 2009.
April heat can occur at any time in the month but is more common in the latter half of the month...only four times has the thermometer hit 90 before April 14th...none before April 7th. This isn't surprising given the trend for the surface to warm further as the month progresses and given extended daylight into late April...but one can get to 90 or close to it at just about any point in April. The longest April heat wave occurred back in the mid 70's -- four day stretch that topped out at a then-record for the month of 94 degrees on April 18th (since broken in 2002).
that we found this past winter over the East Coast. In essence, strong ridge east...strong trough west. No real surprises there...it is interesting to note how close it matches what we went through this past winter. These type of patterns don't always correlate into summer though!
For those wanting heat this summer (I'm not sure who does), take solace in the fact we missed out on an April heat wave!