How hot is too hot for flying hot air balloons?  

Apologies if there is some discrepancies in some of the things I have talked about here, there maybe some incorrect information.***
Flying in high temperatures can be tricky, you have to make sure the size of balloon you are flying is capable of lifting the load of the balloon, gas, basket, burner and passengers. Before each flight a pilot is responsible to carry out a load calculation.
each load calculation differs from the ambient outside temperature and the temperature inside the balloon.
An example would be here at 28⁰c Shads All Up Weight (AUW) would be 310kg BEFORE pilot and passenger weights. You would then do a calculation to find out how much remaining spare lift youd have for yourself as pilot and then your passengers because the warmer the air outside the more heat is required in the balloon to gain lift! I hope to explain this properly soon but the video here gives a rough idea.
Here is a link to Vista Balloon Flights, please note I was not paid or requested to do the mention in the video I was just thankful for the gas.
www.vistaballoonflights.co.uk