Pennsylvania March Temperatures Declining

It has been ridiculously cold in Philadelphia this month, with afternoon temperatures among the coldest on record. I’m looking out the window watching snow falling.

Nighttime March temperatures have been declining in Pennsylvania since the 19th century.

And the likelihood of cold nights has been increasing since the 19th century.

It is cold here again today, but on this date in 1910 Philadelphia was 82 degrees, and more than half of the US was over 70 degrees. CO2 was 300 PPM at the time.

March 25 afternoon temperatures have dropped more than 10 degrees in Pennsylvania  since the 1920’s.

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6 Responses to Pennsylvania March Temperatures Declining

  1. Fran Manns says:….pdf?dl=0

    The climate is always changing but the weatherman does not know why!

  2. Chaeremon says:

    @tonyheller, thank you for, works great on win.

    I’m using date_range=0321:0920 (first equinox semester) but does not handle date_range=0921:0320 (the other equinox semester) in the result ?

    • tonyheller says:

      It can’t go across year boundaries.

    • Chaeremon says:

      @tonyheller (March 25, 2018 at 4:24 pm), thanks. Now using option months= but the Average-Daily-Temperature-Range appears same for:
      – ghcn US.txt months=10 11 12 1 2 3
      – ghcn US.txt months=4 5 6 7 8 9
      What can I do? Is ghcn.exe (13. ‎August ‎2017, ‏‎21:02:30), downloaded as advised , still current.

  3. John Garrett says:

    It’s the politicians and their hot air.

  4. Douglas Hoyt says:

    A source for record breaking temperatures can be found at

    This morning we tied the record low temperature for this date in WV, but it doesn’t show up at the above website.

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