Weather Who

What you do

Sixteen real cities sit on a four-by-four board, and one of them is today's mystery city. There are six clues you can buy — daytime high, night low, rain days, UV index, sea temperature (or "no coast") and humidity — and every one is about the current calendar month. A clue costs 1 point and tells you which band the mystery city falls in, say a daytime high of 18–23 °C, and at the same moment every city on the board shows its own figure for that clue. So you are not asked to remember that Lisbon is milder than Riyadh in October; the numbers are in front of you, and the work is choosing which clue splits the board best.

You flip the cities that cannot be it. Flipping is free and only for your own bookkeeping — the game never flips a city for you, and you can stand one back up. When you are sure, press Accuse… and pick a city. Right ends the puzzle; wrong costs 2 points and removes that city. Fewest points wins, so accusing early and being right beats buying a clue you did not need.

Every day's board is checked before it ships: par, the fewest clues a perfect solver needs to be certain, is computed exactly over all 63 combinations of clues, and only boards with par 2, 3 or 4 are used — no single clue gives the answer away. The mystery city is drawn from 152 cities, and none repeats inside a 152-day block. Everybody gets the same board on the same UTC day, so the result you copy afterwards — a spoiler-free block of squares — compares directly with a friend's.

How long a round takes

One puzzle a day, with no timer. The day's board is small on purpose: six clues are all there are, par is never more than four, and a solve is a handful of decisions. A countdown under the result shows when the next puzzle arrives, at 00:00 UTC.

Missed a day? Puzzle #1 was 2026-09-19, and every later day stays playable: add ?d=YYYY-MM-DD to the address for that date's board. Only today's puzzle counts toward your streak.