Over the past 10 years, Philadelphia Marathon runners have faced temperatures ranging from -1\u00b0C (31\u00b0F) on cooler years to 13\u00b0C (55\u00b0F) in warmer editions. The median temperature of 8\u00b0C (47\u00b0F) puts this race in the favorable category for running conditions.
Wind speeds average 14 km/h during race hours, with peak gusts reaching 22 km/h in challenging years. Humidity sits around 66%, and there is a 50% chance of rain on race day.
These conditions translate to an estimated pace impact of +1.6% compared to ideal running conditions. For a 4-hour marathoner, that means roughly 4 minutes slower than a perfect-weather day.