Hi,
I assume you have the photographic overview plates as well?
For a quick ref to historicals, not PIREPS, I use (as one tool & is free & non commercial)
www.wunderground.com as you can pull up historicals for any ICAO listed airfield. Though I guess you already do use this site, if not input ICAO/IATA code in search box for latest metar then search for history by date. Hope it helps.
Cheers