Weather

The ladder

1. Ages 3–5
   • Rainy DaysTap the rainy days and count themOpen →
2. Ages 6–8
   • Below ZeroCount degrees on a thermometer across zeroOpen →
3. Ages 9–14
   • Carbon BathtubPredict which way the carbon level goes, tap against drainOpen →
   • How High Is the Cloud?Work out the cloud height from temperature and dew pointOpen →
   • Flash to BangCount from flash to thunder and find the distanceOpen →
   and 2 more

   • Forecaster's Confidence LedgerForecast from each clue and say how sure you areOpen →
   • Rain on the RoofWork out how much rain a roof collectsOpen →
4. Ages 15–18
   • Colder Higher UpUse a straight-line model to find the freezing heightOpen →
   • Feels LikeRead the heat index curve for a hot dayOpen →
   • Colder in the WindRead the wind-chill formula for a cold, windy dayOpen →
   • 30% Chance of RainWork out what a 30% chance of rain is a share ofOpen →

Two rules every rung keeps

The Fade Rule. Every game ends on a plain screen: the same numbers with the weather words gone, so the maths leaves with you.

The Own-Lane Rule. Your numbers are compared only with your own past, never with anyone else's, and they stay on this device.

Problems built on something you love help most when the context carries the maths, not when it decorates it. These ladders are a design, not a promise.

Ask a grown-up tonight: “What do you think the chance of rain will be tomorrow, and how sure are you?”