Heat in Perry, Pennsylvania

Well-above average temperatures, coupled with humid conditions, allowed for heat index values to range between 100 and 105 degrees during the afternoon and evening hours of July 25, 2025 across Perry County.

Residence time in the warm sector ahead of a surface cold front allowed for portions of central Pennsylvania to experience ample heating in a highly moist environment during the afternoon hours of July 25, 2025. A combination of heat and humidity allowed for portions of the Lower Susquehanna Valley to experience multiple hours with heat index values exceeding 100 degrees. Lancaster Airport topped out with a heat index of 110 degrees during the mid-afternoon hours.