Mark Sicknote,
If there was no aircraft available, how did you manage to go flying??
A tip on flying on hot days: It worries me that you were "fighting the stall" on the climbout.
No matter what the temperature is, your aircraft has a Vy (best rate of climb speed) that is pretty much constant. In typical GA singles, it's around 70 knots. Climbing at that speed will give you the best climb performance possible under the conditions. (If obstacle clearance is a problem, you can use the Vx Best Angle of Climb speed, typically a few knots slower.)
The trap on a hot day is, typically you are used to pitching the nose up around five or ten degrees to get your best rate of climb speed. On a hot day, youll stall at that sort of attitude. Sounds like this is what was happening to you. Push the nose lower until your airspeed shows the same speed you normally want - the best rate of climb speed. On a hot day, this is likely to be one or two degrees above the horizontal... this is perfectly normal.