Years Without A June 90
Going back over 100 years of data, there have been only eight years where Philadelphia went through an entire month of June without hitting 90 degrees. It's a pretty rare accomplishment in any given year as you need persistent clouds, showers, and cool weather to keep the thermometer from cracking 90. The average monthly temperature for June in current times is 72.8 degrees and in each of the eight years listed above the monthly temperature three or more degrees below our current mark.
In most of those years, a cool June also coincided with a cool summer overall. The number of 90 degree days in Philadelphia in years where June didn't have a 90 was below our current averages (26 90 degree days) in all years but 1977. Summer temperatures, which currently average 75.4 degrees in Philadelphia, were cooler than that in each of those years as well.
Seven of those eight years, except for 1916, featured above average precipitation. 1972 should stand out to many as the year Agnes made her mark.
One thing that also stands out from each of these years as well is that each of the years going back to 1950, when more accurate ENSO data was first measured, were years where a Nino event of varying degrees took place the following winter. 1958 was in the middle of a Nino event that started the prior autumn, with 1972 and 1982's events being full throttle strong Ninos during the summer and through the following winter.
Of course, the resulting winters that followed varied markedly. 1972-1973's winter was "The Snowless Winter" in Philadelphia, with 1982-1983's winter marked by a powerful Nino where we did manage above average snowfall. 1977-1978's winter was a textbook winter that few can't forget.
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