Hello! To help start off this community, I'm going to put a link of resources that I have found personally helpful while playing New Horizons!
This is just what I found myself to be helpful. If you think anything else would be helpful to put here, please tell me!
https://acnh.guide/ - An iOS and Android app which is a database and guide to New Horizons.
https://acpatterns.com/ - A place to browse and create patterns online, works on New Horizons and New Leaf.
Setting up a weather seed is time consuming, but nice when it is done. We use the ACNH Pocket guide for android, it has turnip tracker and weather seed incorporated in it.
Yeah, I've been trying to get a weather seed for a while, keep filling it out, but must be doing it wrong, since regardless of the dates and weathers I put in, it always says that there's no seed with that weather at the end
We never could get a seed using the weather, we were always wrong. We watch for shooting stars, and it is best on a busy night. Usually takes 4 or 5 bursts in a row, after you enter the several burst (usually 5 shooting stars a single minute time frame ) the program allows you to also use the time between let's say you have burst at 7:15, 7:18, 7:50 7:55 you add those there is an option to use the no star time between and it will record that as well and then most times it will come up with seeds. The first time we did it the seed times seemed wrong, but the problem was I did not go into the details to see the actual times. According to the website you can get a seed in a half hour under ideal conditions but most times it takes a couple hours.
One time it took longer because I forgot to clear my browser cache and I think it was using some previously entered info from another island we did because after I cleared the cache and reentered the data it found the exact seed and only that seed.