I made a world map where you pick a month and see everywhere that's a good time to visit
I was planning a trip to Vietnam a few weeks ago and as everyone I asked ChatGPT/Claude when is a good time to visit and got a confident answer that turned out half wrong (and it contradicted itself when I pushed). The manual route wasn't better, northern and southern Vietnam have nearly opposite seasons, so every "best time to visit Vietnam" article just confused me more, and I ended up with a dozen tabs and no clear picture.
As a visual learner, I built what I actually wanted: drag a month slider and the whole world recolors by whether it's a good time to be there. It splits countries like Vietnam into their real regions instead of pretending one season fits a whole country. It's El Niño/La Niña-aware and searchable down to cities.
No signup, just a single web page.
Feel free to try it out and let me know your feedback. Thank you! :)