Do you know why old farts like to talk about the weather so much?
It's an evolutionary trait. Back in the caveman days, old guys who couldn't contribute to the hunting anymore had to figure out some way to be useful. So, they sat around and observed the clouds to try to give useful info to the rest of the clan. The tribes with the best old weather-watchers survived, passing down the genes.
Now if you could give a ten-day forecast based on your knee, we're all ears!