I have always kept my stop, fix, hype clear and wash to within 2 deg F of my developer. In the summer my tap water is about 74 deg F in the winter I prefer 68 deg F (I'm a creature of habit).I develop my prints with all solutions at room temperature (around 75 deg F) . My darkroom is heated in winter and cooled in winter.(posted 8745 days ago)When I started developing negatives after a 10 year hiatus my first rolls (t-max 400) were developed in the kitchen sink with wash water 10 degrees colder than all chemicals. The negs were grainy and barely printable. Under a 10X loupe the grain structure was clumped and uneven.Careful attention to wash water temperature has eliminated this problem.