THE BEST TIME TO COME TO PoA

ANYTIME!
The locals will say don't come in Winter (July - August) because it's too cold, PAH! Nothing that a roaring log fire and a glass or two of good red wine can't cope with.
Others will say don't come in Summer (December - February) because it's too hot, PAH again, nothing that a good swimming pool and a few glasses of chilled lager can't manage.
Seriously though. Winter temps can go as low as 3-4c, but that's not usual. Usually it's around 8 -12c. The Winters here go through cyclic climate. It gets cold, warms up (sometimes, and I've seen 30c in the middle of "Winter") then rains for a few days, cools right down then the cycle begins again. This happens over a period of about 5 - 15 days.
Summers, on the other hand, are HOT. Normally around 28-30c but it's not unusual to see 35 plus. Again it's cyclic, but not regular, when it heats up too much there's a mutha of a thunderstorm for an hour or so then everything gets to steaming and it cools down a bit. The only solution for the Summer as I said is to find a swimming pool with a bar. There are no public swimming pools so your only chances are to get an invite to a club or a club or get friendly with someone with a house and pool. Watch this space, I'm working on contacts!
If no pool's available, find a good bar that has a cool interior and drink cold beer in large quantities.