Mine are in the upper 90's and I still get rain fade. ANYONE that says they never get it is either lying or lives in a desert.
Not saying I dont get rain fade. No one with sat can say that.
I will say that under conditions that the OP states, that is unreasonable, and not normal.
It takes a heck of a downpour for me to lose signal on my D* or E* setup. Generally these days, my E* goes out about one minute before my D* setup. Both only in HEAVY rain. Never during light or only couldy days.