Knee Knacker runner Sean Lavin started doing some research related to weather on Race Day over the past dozen or so years. Here is the first chart he produced in 2010, showing the maximum temperatures (Celsius) on Race Day:
In 2013, Pat Malaviarachchi took it a step or 2 further. He brought the temperature data up to date as of last year’s race (using race day temp at 2pm), and also overlaid it with the median finishing times over the years. Here is what it looks like:
As noted by Pat — “There’s definitely a trend going on between temperature and median finishing time, particularly in recent years (correlation coefficient is almost 0.7, which is pretty good)”.
Many thanks, Pat (and Sean too)!