Between 350 and 375 degrees.
350 degrees, period. In a very big pot that gives lots of headroom, because the oil will bubble up. Dry the chicken thoroughly, inside and out. Salt and pepper if you like, Lower into fat slowly. Monitor the heat. It takes about 4 minutes per pound for a whole chicken, plus 5 minutes. Example, a 5 pound chicken: 4 X 5= 20 + 5 = 25 minutes of deep frying. Let rest on a cutting board for 5 to 10 minutes before carving.