I too have rose tinted spectacles about childhood summers, but here is a more invidious condition from which I have suffered in the past which I call ex-pat syndrome.
This occurs in any hot sunny country, where after a time the Brit who lives there (I'm thinking of Saudi especially) only remembers the British sunny days - you know pub garden with river and swans, walks on the common or in the park, open air concerts etc.
Then, when homesickness peaks, the Brit refuses another contract and heads back to rainy, cold, miserable Britain. Oh how the realization kicks in after a month of unremitting rain.
However, to demonstrate a point, I am adding some photos of bad weather in Spain, just to make you all feel a bit better......
This is the town square at about 4pm in August a few years ago (during the fiesta!) The temperature before the storm hit
(without warning) was in the 100s and very sunny. There was a hailstorm (see on top of the tables) for 10 minutes. Then the sun came out and within 10 minutes, the whole plaza was bone dry again.
The thing I like about Spanish weather is its extremes - no London drizzle - always spectacular!