Had it been a leap year, the race would have been on the 28th (last full weekend in February). And the course was uphill both ways that year, to boot. The coldest temperature reported by the Birkie for the start was -13º in 1974. The coldest DLH/EAU temperature was in 1994, when the average of the two sites was -6.5º.
Four of the past seven years have seen the start temperature below 0º.
The coldest reported temperature at Hayward was in 2011 when it was -6º (and Cable was -10º). The average high is 29º, the average low is 13º and the average 8 a.m. Checking those against Hayward temperatures in recent years it seems to be a good approximation. N.B.: There is not data for the Hayward airport prior to 1997, so we averaged the temperature in Eau Clare (EAU) and Duluth (DLH) to get an approximation. And we track weather up to race day on the homepage quite frequently. (What, you were expecting something else?)ĭo note, we covered some broader-scale weather information on the 2012 statistics page. So to answer the question of what weather is on race day, here is some fun data. It’s a silly question in some ways-temperatures have ranged from 10 below to 50 above on race day-but a good one in others. 
I’ve been asked more than once what the weather is like for the Birkie. In the decade since I first wrote this there has been two Birkie days with warm weather (20, for people skiing Saturday in person), once with the race canceled (2017, 30˚ on race days but a week in the 50s before) and the rest have been pretty darned nice.
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