rhodes68answered grow question 6 years ago Depends on the strain, seriously. I watch the plant and look for signs its not comfortable and I wish I could tell you exactly what I am looking at but its a gut thing unless its obviously out of whack. Generally if you are comfortable it is...know your strains Mex Air is pretty resistant to heat took 100 F here just fine for 4 days running. Cool does not seem to effect it either as it gets as low as 48 F at night, so thats my experience with the strain. Good luck