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Weather Outlook for July 9, 2013

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Posted: July 9, 2013

Some relief toward the weekend and then hot weather continues.

Summertime temperatures and high humidity have been firmly in control across Pennsylvania as we move into the seasonally hottest weeks of the year, but some relief is on the way as we head toward the weekend.

Since June 22, daily average temperatures have ranged from near normal to as much as 10 degrees above normal with minimum temperatures more persistently above normal than maximum temperatures. In fact, very few spots have recorded a minimum temperature below normal since that date. Dewpoints have held in the 60's to near 70 degrees reflecting high humidity. Precipitation for the past week reflects the localized effects of summer showers with portions of the northwest, southwest and central mountains receiving well above normal amounts of rain while most of eastern Pennsylvania and the northwest mountain areas were well below normal. However, looking back two weeks, precipitation was above normal for the entire state except for a few below normal pockets.

A cold front approaching the area on Wednesday will kick off numerous showers and thunderstorms across the state with most areas receiving at least 0.25" of precipitation with higher amounts in thunderstorms, especially across the western portions of the state. More seasonable temperatures and less humidity will prevail for Thursday through Saturday. Clouds and the chance for showers will linger in the southeast on Thursday as clearing skies advance from west to east across the state. Friday and Saturday will be partly cloudy and seasonably pleasant with lower humidity. Temperatures will range from the mid 70's in the mountains to the upper 80's in the southeast on Friday, inching upward a few degrees for Saturday. Thursday night minimum temperatures will drop below normal for the first time in three weeks. Friday night will be the coolest with low's dipping into the mid to upper 50's except in the southeast where they will remain in the 60's. By Sunday, temperatures and humidity will start to creep upward again as warmer and more humid air filters northward with highs in the mid to upper 80's under partly cloudy skies.

A cold front will lurk to the north in Canada for next week but will have difficulty reaching Pennsylvania until late in the week. Some enhanced shower activity is possible on Monday or Tuesday with widely scattered showers through the remainder of the week. Humid conditions will continue through the middle part of the week, but hotter and slightly drier conditions may take over toward the end of the week as temperatures gradually creep upward into the mid 80's and 90's ahead of the cold front in Canada.

Contact Information

Arthur A. Person
  • aap1@psu.edu