I always love visiting the old Roman town of Gerasa on our trips to Jordan, & no exception on our last visit, albeit in the heat of July! My one bug bear would be that, as a foreigner, I was pestered quite a bit by shop vendors for my custom. Understanding that times have been super tough during covid, I was more than willing to buy souvenirs from the stalls at the entrance - albeit on a limited budget - but still felt quite pressured which did spoil the atmosphere. My recommendation at this time would be to hire a guide in advance, or get a recommendation on arrival. There's so much of historical interest that's really worth knowing about. (Don't let a "guide" attach himself to you & then request a good sum of money for the very little knowledge he has - as I mistakenly did.)