On my first visit to Ascension (1985 - civvy job), I'd heard about the Red Lion and decided to make it a stopping point on a ramble where I would also pick up a few cans of soft drinks to take with me on the remainder of the walk.
In hindsight, when I found the place deserted, I should have turned back, having no drinks with me. By the time I'd visited Boatswain Bird Island, English Bay and Comfortless Cove and not found an ice-cream van at any of them, I was delirious and glad to stumble into Georgetown, where I thought I'd be able to get a drink. Alas, everywhere was shut!
I continued on towards Travellers Hill via the coast road and was surprised and delighted to find that there was a function on at the US Base (4th July celebration) - this was why Georgetown was deserted. At last - a chance to get a drink.
Alas, only Budweiser was on offer. Being severely dehydrated, it didn't go down too well. I haven't touched the stuff since.
I was there in 1985 (June - November) and experienced 30 degree temperatures (night and day) and a constant 30mph wind. During that time, it rained twice. Once it was drizzle for an afternoon, the other time it was a torrential downpour that lasted only 30 minutes, but took out most of the roads.
I went back a couple of years ago in October and it rained every day for a fortnight, with temperatures varying between 14 degrees and 30 degrees.
So the tip is, prepare for hot and sunny, but don't forget your waterproofs and a warm pullover.