Beginner Gardening: Miniture rose bush, leaves started to turn brown, 1 by hburry

hburry wrote:
We were given a small potted miniture rose bush in January, and it has been doing well up to now (July), I have given it rose bush food with the watering, I moved up 1 size of a container and there have been lots of roses on it. It is outside in full sunlight. It has been very hot (30+ C) and dry and humid so I have been watering it every other day.
However this past few days, with lots of roses in bloom and buds, the leaves have been turning brown and some of the new buds seem to be drying up... what is happening?
I have attached a picture...
Should I transplant it outdoors? Will it withstand our harsh cold winters here in Canada, in Kitchener ONtario?