real world weather not realistic?

ok there were some pretty sever flying conditions at my hometown denver(hometown airport denver intl) so i thought i test my simulator skills by trying some landings there in a 747(for fsx) but when i download the weather it said the the wind was 5 knots that was right but the visibility was over 50 miles and there was no rain so i went online to see if this was correct weather and of course it wasnt the visibility was 5 and there was heavy rain any way to fix this besides user-define weather?