Spaz, yes, the HAS will be used by 617 Squadron but daily operations will take place under sun shelters. For the OCU, jets will use the purpose-built hangar and sun shelters for daily ops.
F-35 is very resilient to extremes of climate; tested to such as your link describes. One aspect of being quite "buttoned up" due to stealth is that there's a lot of sealed areas for avionics. That helps quite considerably, alongside the conditioning systems.