A vigorous upper level low pressure system tracked across the region bringing a chilly airmass into the region. temperatures were cold enough for snow to fall across most of eastern Pennsylvania during the day on the 9th. Accumulations of snow were mainly an inch or two where it fell hard enough to accumulate on grass. Localized amounts up to 5 inches were reported. Highest snowfall total, county-by-county, were:  2.0 inches in Seisholtzville (Berks County), 0.6 inches in West Rockhill Township (Bucks), 2.0 inches in Lake Harmony (Carbon), 5.0 inches in Malvern (Chester), 4.7 inches in Wayne (Delaware County), 3.5 inches in Salisbury Township (Lehigh), 1.0 inches in Pocono Summit (Monroe), 2.0 inches in Graterford (Montgomery), and 0.4 inches at Philadelphia International Airport.
Cold air behind the departing low pressure system brought minimum temperatures down to the low to mid 20s by Sunday morning, April 10th.  The lowest temperature recorded at various locations were:  20 degrees F in Mount Pocono (Monroe), 26 degrees at Lehigh Valley International Airport (Northampton), 25 degrees in Reading (Berks), 25 degrees in Pottstown (Montgomery), 25 degrees in Doylestown (Bucks), and 31 degrees in Philadelphia.  Given the early start of the growing season due to warmer-than-normal temperatures the previous month, unprotected plants were subject to a hard freeze.
A few power outages were reported in Northampton County from this event as well.

Winter Weather in EASTERN CHESTER, PENNSYLVANIA
From 09-APR-16 09:15:00 to 09-APR-16 15:00:00 (EST-5)
Reported by: Trained Spotter

A vigorous upper level low pressure system, combined with unseasonably cold air, produced rain and snow showers during the daytime hours on the 9th.  Most of the accumulating snow was confined to grassy surfaces, so human impact was minimal.  By late in the day, precipitation had moved out of the area.  Some snowfall totals were:  5.0 inches in Malvern, 3.5 inches in Valley Forge, 3.5 inches in Exton, and 1.8 inches in West Chester.  All other reports from the county were less than 2.0 inches.

Winter Weather in DELAWARE, PENNSYLVANIA
From 09-APR-16 09:15:00 to 09-APR-16 15:00:00 (EST-5)
Reported by: Trained Spotter

A vigorous upper level low pressure system, combined with unseasonably cold air, produced rain and snow showers during the daytime hours on the 9th.  Most of the accumulating snow was confined to grassy surfaces, so human impact was minimal.  By late in the day, precipitation had moved out of the area.  Some snowfall totals were:  4.7 inches in Wayne, 3.3 inches in Glen Mills, 3.0 inches in Ridley Park, 3.0 inches in Bromall, and 2.5 inches in Chadds Ford.   All other reports from the county were less than 2.0 inches.

Winter Weather in LEHIGH, PENNSYLVANIA
From 09-APR-16 10:00:00 to 09-APR-16 15:00:00 (EST-5)
Reported by: Trained Spotter

A vigorous upper level low pressure system, combined with unseasonably cold air, produced rain and snow showers during the daytime hours on the 9th.  Most of the accumulating snow was confined to grassy surfaces, so human impact was minimal.  By late in the day, precipitation had moved out of the area.  3.5 inches of snow was reported in Salisbury Township.  All other reports from the county were less than 1.0 inch.