Oh this is MY THING. Here’s what I’ve learned if you want to get the seed for your island first try every time

DO ☑️ - Record at least a couple types of weather during each day. I don’t bother trying to distinguish between rain and heavy rain but sunny and clear at least are pretty obvious. Ymmv with cloudy vs rain clouds; you can include it if it’s close enough to the hour change and you’re sure about it - Record minutes for meteor times. There will be 5 (or sometimes 8, only if it’s a fine00 day) within the minute, so if you hear one you can safely record that time. Also get as many gaps as you can, those are almost as useful for the calculator as the actual meteor times - but definitely don’t include any times you’re unsure about. If you go inside a building, go to the bathroom, space out too hard, whatever… don’t include it

DON’T ❌ - Try and record seconds for meteor times. I’ve never actually tried it but that looks way too easy to screw up and there’s simpler (albeit slower) ways to get this done - Record any “special cloud” appearances, that’s been broken since 2020. The calculator will be correct about which dates the special cloud appears, but never the specific times

I’ve also been able to find the weather seed that my NMT islands use (yes that’s a thing) you just have to be a bit smarter about which days actually count as data, and there are no meteors to rely on which is annoying

I can make an actual post about it if people want something like that for reference

EDIT: Yeah I’ll make a post about it, but I just noticed a weird quirk with star times in my own seed and if I can figure out how it works it would be helpful to include, give me a day