I too can predict if it will rain in two hours' time (somewhat reliably) by looking out of the window. Years ago, I set up a simple website that screen-scraped

I too can predict if it will rain in two hours' time (somewhat reliably) by looking out of the window. Years ago, I set up a simple website that screen-scraped the BBC's weather predictions, and compared them against the day's weather report to calculate a very crude and basic accuracy. For the UK towns it monitors, a dumb prediction of "tomorrow's weather will be the same as today's" gives a 34% accuracy - which only falls to about 25% when predicting the weather for next week! Luckily, the proper weather forecasters do a bit better than this :) https://weather.slimyhorror.com/ https://weather.slimyhorror.com/ (Excuse the basic site, I set this up over 17 years ago, and with minimal tweaks it has been left to its own devices since then)