The last track day of last summer, there were a ton of wrecks because it was so cool (60's that morning, high only in the low 80s). Fine temps for street riding on street tires, but not track riding on track tires. Guys were getting impatient and pushing it too soon, rather than going a couple laps first. It was a shame, and lucky no one was seriously hurt (just one broken collarbone).
Hope you aren't too sore the next few days.