Over the past 10 years, Cologne Marathon runners have faced temperatures ranging from 10\u00b0C (49\u00b0F) on cooler years to 17\u00b0C (63\u00b0F) in warmer editions. The median temperature of 14\u00b0C (57\u00b0F) puts this race in the neutral category for running conditions.
Wind speeds average 15 km/h during race hours, with peak gusts reaching 23 km/h in challenging years. Humidity sits around 72%, and there is a 20% chance of rain on race day.
These conditions translate to an estimated pace impact of +3.6% compared to ideal running conditions. For a 4-hour marathoner, that means roughly 9 minutes slower than a perfect-weather day.