Why were the temperatures so warm late 2006 through early 2007 in southeast PA/NJ

Essentially, the jet stream assumed a position much further north than normal for the early winter months. This allowed warm air (from the south) to flood into our area, while the coldest air was capped well to the north.

As areas of Low pressure passed through the Great Lakes, we ended up being on the mild side of those storms, resulting in rain instead of snow.

Another factor that impacted our unseasonably warm weather was the weak to mild El Niño occurring off the coast of South America (which often has a significant impact on weather globally).

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Historical Averages

High Low
Current 42°F 38°F
Average 41°F 23°F
Record 71°F February 23, 1985 2°F February 23, 1972