Welcome to MeteoNook Alpha

MeteoNook is a weather forecaster for Animal Crossing: New Horizons version 1.4.0.

This tool will predict your island's weather patterns, including exact times for meteor showers, rainbows and the aurora borealis. To get started, you'll need the seed, a long number unique to your island that determines what your weather will be. Follow the instructions on the Seed tab to find it.

Changelog

  • 07/02/2020: Initial support for 1.3.0. There are still a couple of necessary changes (Fine02 and Fine06 have changed slightly) which will be implemented tomorrow.
  • 07/08/2020: Full support for 1.3.0. Light showers are now shown on the Overview tab.
  • 07/15/2020: With many thanks to several contributors, MeteoNook now includes translations into French, German, Japanese and Chinese. If you would like to contribute or improve a translation, check the README on GitHub to join the POEditor project.
  • 07/16/2020: Fixed the dates for the Bug-Off in the Southern Hemisphere. Added Chinese (Traditional) and Russian translations.
  • 08/02/2020: Added predictions for special types of clouds that appear during certain parts of the year (displayed using the 🌀 symbol), and the fireworks show added in 1.4.0.

Frequently Asked Questions

Will my seed change if I time travel?
No. It's picked randomly when you create your island and never changes.
Where is Celeste?
At the start of the week, the game picks a random day for Celeste to appear out of the days that have meteor showers. This is fully random and not based on the seed, and cannot be predicted.
What does the 🍃 mean?
The number represents the strength or speed of the wind. 0 is completely calm, 1 is a breeze, and 5 is the maximum that you can get in AC:NH. It does nothing useful whatsoever, but the effect it has on items like palm trees and the clothes line is quite amusing.
Why are the times for stars greyed out or in bold on the Overview tab?

During a light shower, you have a small random chance of seeing five shooting stars every minute between 19:00 and 04:00. MeteoNook analyses the schedule to try and figure out when multiple groups of stars appear close to each other. The times in bold are when you can expect to see quite a few stars. On the other hand, the times that are faded out are when stars are few and far between.

This lets you see at a glance roughly when to play if you want to get more. Of course, you can always click 'see more' for exact times.

The predictions were perfect for weeks and are now suddenly wrong! What happened?
On certain days, Animal Crossing will ignore the weather pattern selected by your seed and instead use the fixed EventDay00 pattern (clear weather all day, without shooting stars). MeteoNook shows most of these, like the Bug-Off and fireworks shows, with two exceptions: the day of K.K. Slider's first concert and any day on which you add a new resident player. So, if your weather forecast suddenly looks wrong after making a new profile or after you've just reached 3 stars, don't worry, that's supposed to happen. It will return to normal within the next couple of days!
Why am I seeing more shooting stars with the same seed than I did before?

Seeds have not changed, but version 1.3.0 (the Summer Update Wave 1, where diving was added) has changed a couple of aspects in the weather system. Previously, during a light shower, shooting stars could only appear between 19:00 and 04:00 in hours where the weather was clear/fine. In 1.3.0, they can also appear during hours when the weather is sunny.

Two of the three 'light shower' patterns have also been changed. Fine02 is now cloudy at 18:00 and sunny at 19:00 (previously the other way round), and Fine06 is now cloudy at 17:00 and sunny at 19:00 (previously the other way round). The seed finder will accept both the old and new versions of these patterns.

Why does it say I need more data?

There are over 2 billion possible weather seeds, but only one is correct for your island. MeteoNook goes through every single possibility, calculates the weather it would give, and checks it against the data you provide. If it doesn't make sense (e.g. you said you had rain at a given time, but the seed would make it sunny) then that possibility is ignored.

During testing, we've had success with the following combinations...

  • The known dates for between 5 and 7 heavy showers
  • The known hour and minute times for stars in a light shower, spanning between 1 and 3 hours
  • The known hour, minute and second times for a few different stars in a light shower
  • The known dates and times for between 5 and 7 rainbows

It is of course heavily randomised, though. You might get lucky and find yours with less information, or you might need more!

Why can't it find my seed?
One mistake in the data you enter will be enough to stop MeteoNook from finding the correct seed. This tends to happen with weather types, as it's easy to mix them up. If you're not completely sure, then select the appropriate "not sure" option. It doesn't narrow down the options as quickly as selecting a specific type, but it's less risky - a slow but correct result is better than no result!
It gave me a seed, but the results are wrong!
This happens sometimes, it sucks. What's most likely happened is that there was a mistake somewhere in your data and MeteoNook has found a seed which fits what you asked for, but doesn't actually match what your island uses. Try changing your weather types to "not sure", just in case it's a mistake with cloud types. If that doesn't help, you may have to collect new data.
Will you add X...?
Maybe. No promises.
Can I give you money?
Since a few people asked me on Discord and Twitter, I've added some links to the footer. Please don't feel obligated to do so, though!
Will this be open source?
This new version of MeteoNook is available on GitHub under the GNU Affero GPL 3.0. The repository link is at the bottom of this page.