I live in Texas and often process as high as 80 degrees F. in the summer (usually with PMK). I notice slightly more base fog at higher temperatures, but otherwise don't seem to have a problem with the development. I do know that some developing agents respond differently to temperature changes--paraminophenol hydrochloride (the agent in Rodinal) is much less sensitive to temperature changes than most other known agents.(posted 8494 days ago)