MAYBLY✳ THE PERSONAL WEATHER BUREAU · ISSUE 001
FORECAST DESK / 01LOCAL WEATHER, REAL DATA

How good is your weather intuition?

Pick a city. We draw a past day; you guess the chance of rain and uncover its weather in seconds.

Or try one:

02 / OPEN A REAL DAY

We choose a past date and keep its weather hidden until you commit a number.

PERSONAL RECORD

Your receipts

This record stays in this browser. Clearing browser data removes it.

METHOD SHEET / V2

What counts as a result?

Each question asks whether Open-Meteo's historical weather record shows at least 0.1 mm precipitation from 06:00 through 22:00 in the selected city's local time.

That record combines observations and weather models on a geographic grid. It is not a claim about a rain gauge on a particular street. We show the recorded amount and source with each revealed round.

Your score is 100 × (1 − (your probability − outcome)²), rounded to a whole point. For example, 90% with rain recorded earns 99 points. A 50% call earns 75 either way. This is a game score, not a measure of intelligence.

Tomorrow's forecast is saved before its target day. Once the day begins locally, the probability is locked. It resolves after the 06:00–22:00 window and when the historical source is available. If source data is missing, the forecast stays unscored.

All rounds and forecasts are stored in this browser. No name, account, wallet or device location is collected by MAYBLY.