Ideal growing temps?

Now that the summer is here, grow room temps are going up. I was wondering if anyone knew what the average temperature range was for cannabis plants? How hot can your grow room get before it begins affecting the plants? Same for winter, how cold is too cold? (fahrenheit temps, please)

 

73-78 is prime,can increase to 85-90 with Co2 without being detrimental to plants health.

 

Thanks meangreen