Forecast by city

Philadelphia-Delaware Valley Winter Forecast 2016-17 (La Nina Snow)

Winter Forecast
La Nina is here but it's on the weaker side as of September. We see this weak La Nina to peak now but get a second burst in December and January before moving to a neutral pattern Febraury and March. This weak La Nina means a colder winter for most of the nation and certainly much colder than last winter. The key to this winter will be how cold is the cold and how dominate will the Northern Jet (Arctic Jet) be vs. the moisture loaded Southern (Sub-Tropical Jet)?. Last year the Southern Jet was the big player off a massive El Nino but this winter that will not be the case most of the country. We expect an average swing of the NAO (North Atlantic Oscillation) but much more of a dip from the AO (Arctic Oscillation) bringing a few polar vortex periods and many Alberta Clippers.
Winter Forecast

Philadelphia and the Delaware Valley sits in the slightly above average snowfall this winter and below normal temperatures overall. Do not be surprised to see an early snow event this season. We are expecting more snow storms overall, but with smaller type systems.

Last Winter’s Snowfall
27.5″

Biggest Winter Snowfall Ever!
78.7″ (2009-2010)

Normal Snowfall
22.3″

This Winter (2016-2017)
25.0″ (+2.7″)

TEMPS THIS WINTER
OVERALL -1 to -2 BELOW NORMAL

DECEMBER COLDER
JANUARY NORMAL
FEBRUARY COLDER
MARCH WARMER

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