Historical weather data, all-time temperature records, and monthly climate averages for Bethlehem, PA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Bethlehem sits right in that unpredictable shoulder season — historically, the date averages a high of 57° and a low of 36°, but the thermometer has swung anywhere from a bitter 21° (1995) to a shirt-sleeve 81° (1985). There's about a 1-in-3 chance of rain today, though snow is nearly off the table at just 1%.
Bethlehem's weather has real teeth at the extremes — the city has baked at 105° in July 1966 and plunged to -15° in January 1994, a 120-degree spread between its all-time records. A single October day in 2005 dumped 8.71 inches of rain, and the January 2016 blizzard buried the city under 30.2 inches of snow.
Summer is the clear headliner, with highs peaking around 85-86° in mid-July before a gradual cool-down through fall. Winter bottoms out the week of January 15-21, when average highs barely crack 35°. If you're trying to dodge rain, avoid early August — that's historically the wettest stretch of the year, averaging over an inch of precipitation in a single week.