Ideally, your film developer and other chemicals should all be used at 68°F. In reality, temperatures can vary widely unless you have an expensive fluid control system installed in your darkroom.

Fortunately, we have found an easy Fahrenheit chart that works great.

64°	66°	68°	70°	72°	75°	77°	80°
5:00	4:30	4:00	3:30	3:15	2:30	N/R	N/R
5:30	5:00	4:30	4	3:45	3:00	N/R	N/R
6:00	5:30	5:00	4:30	4:00	3:15	N/R	N/R
6:30	6:00	5:30	5:00	4:30	3:30	N/R	N/R
7:15	6:30	6:00	5:30	5:00	4:00	3:45	N/R
8:00	7:15	6:30	6:00	5:15	4:30	4:00	3:30
8:45	7:45	7:00	6:30	5:45	5:00	4:30	3:45
9:15	8:15	7:30	6:45	6:00	5:15	4:45	4:00
9:45	8:45	8:00	7:15	6:30	5:30	5:00	4:15
10:30	9:30	8:30	7:45	6:30	6:00	5:30	4:45
11:15	10:00	9:00	8:00	7:15	6:15	5:45	5:00
11:45	10:30	9:30	8:30	7:45	6:30	6:00	5:15
12:30	11:15	10:00	9:00	8:00	7:00	6:15	5:30