Because if you happen to live in a city with a moody climate, you don’t sound like an old person when you discuss it – EVERYONE notices the weather.
It’s always present, mercifully providing the age-old, tried and tested conversation starter or filler.
It’s also a convenient way to bore someone you don’t want to talk with to death, thus making them go away, but for this to work you can’t be funny – you should be exceedingly negative and drone on about one thing, like the rain or the fog. Hopefully they will get the hint.
If for some reason you’re not jumping directly in to a discussion about clothes or shoes (who doesn’t love those), talking about the weather is a good, albeit slightly roundabout way to do it. “Were you also caught in that downpour the other day? My chinchilla wrap was absolutely ruined. Oh, that’s a divine one you’re wearing, by the way, is it fox?”
Rainy weather may lead to stimulating debates on the merits of raincoats vs. umbrellas and rain gear or protection in general.
And finally, there are all these weather-referencing musical numbers and songs out there.
From the ever quotable classics:
To their mashups with 21rst century chart-toppers:
Or the gloriously ridiculous:
And the plain lovely:
Seriously, I could go on for hours.