It was a warm Easter this year with rain showers, which isn't as rare as you may think.
The high temperature for Easter Sunday, 2013 was 58 degrees, well above the daily average of 48, in Buffalo. Rainfall was measured at the Buffalo Airport at 0.08".
Looking back at high temperatures for Easter over the past 12 years, about half of the Easter Sundays were at or above average, and half had precipitation, mainly in the form of rain.
However, take the data with a grain of salt since Easter can fall on a Sunday in March or even in late April.
Note: My current meteorology intern, Chase, helped me with these stats. Yes, he interned on Easter. That's how it is in this business. Work odd hours and most holidays. Have to really love what you do!