Early track season pavement temps, where do you draw the line for too cold?

After 6+ months of BS weather in the northeast, my track will finally open this week but temps are looking to be in the low 50s. I'm interested to hear from you guys/girls about where you draw the line for it being too cold pavement-wise to ride safely. I'm debating going, as 50ish degrees sounds like a recipe for low siding. via /r/Trackdays https://www.reddit.com/r/Trackdays/comments/8etxog/early_track_season_pavement_temps_where_do_you/?utm_source=ifttt