Historical weather data, all-time temperature records, and monthly climate averages for Jefferson Hills, PA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Jefferson Hills runs mild but unpredictable — the average high of 58° can swing wildly, from a balmy 78° back in 1950 to a bitter 20° low as recently as 2013. There's also a coin-flip chance of rain today, with a small but real 8% shot at snow.
Jefferson Hills has seen some serious weather extremes over its 90-year record, from a scorching 102° in July 1936 to a brutal -16° just six months later that same year. A single September day in 2004 dropped 6 inches of rain, and a November storm in 1950 buried the area under 12 inches of snow.
Summers are the sweet spot here, with highs peaking around 84° in mid-July, while mid-January is the time to stay inside — average highs barely crack 35°. If you're planning around rain, late spring is the wet season, with the third week of June averaging over an inch of precipitation.