Historical weather data, all-time temperature records, and monthly climate averages for Philadelphia, PA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Center, PA lands right in the heart of spring transition — expect a high near 61° and a low around 43°, though the range has been wild historically, from a balmy 79° in 1999 down to a freezing 32° in 2013. Nearly half the time (47%), you'll see some precipitation, so keep a jacket handy.
Center, PA has seen the full extremes — a scorching 104° in July 1999 and a brutal -5° in January 1994, a swing of 109 degrees between its hottest and coldest days on record. The wettest day ever dumped 7.5 inches on September 28, 2004, while a January 1996 snowstorm buried the area under 24 inches in a single day.
Summer is the main event here — the warmest week of the year (July 16–22) averages a high of 91°, while July is also the wettest stretch with nearly 1.4 inches of precip in a typical week. If you prefer cooler weather, mid-January keeps highs around 40°, making the shoulder months of May and September the sweet spot for comfortable, drier conditions.