Historical weather data, all-time temperature records, and monthly climate averages for New Castle, PA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in New Castle sits in that classic spring transition zone — the average high is 58° but the date has seen everything from 83° (back in 1910) to a brutal 16° low in 1995. There's a 43% chance of rain, so don't leave the umbrella home, though snow is mostly off the table at just 6%.
New Castle's weather has real range — from a scorching 105° in July 2011 to a bone-cracking -27° in January 1994, that's a 132-degree spread over its recorded history. The wettest single day dumped 8 inches of rain in September 2004, and a November 1950 storm buried the city under 21.3 inches of snow in one shot.
Summer is the sweet spot, with highs peaking around 85-86° in mid-July and warm weather holding through August. If you're cold-averse, avoid late January through early February when highs average just 36°. June into early July is the wettest stretch, averaging over an inch of rain per week.