BoostN, please read your owners manual it gives a couple of suggestions of what to do for high temps one is to shut the ac off the second is to turn the heater on full blast. Every driver has to decide for themselves what temperature is max for me it's 240, a lighter foot helps to.
JSchneib, What gear were you in and how fast were you going? Did you have the Ac running? For long climbs I turn the air off at 228 at 235 I slow down or drop down a gear I never want to go above 240.