Aha

Packing for a trip in the other scale? Save a few familiar days, not just a conversion chart. What did 10°C feel like on that walk? What about 25°C in the sun? Give the numbers a memory to attach to.

Moving abroad gives you a new answer to an old question: ‘Is 18 warm?’ 18°C is about 64°F. Whether that means a jacket is between you, the wind and whoever controls the café heaters.

The tiny win we're building Aha around: seeing a forecast in the other scale and having an opinion before reaching for a calculator. Too cold for lunch outside. Perfect for a walk. Finally, weather small talk without the maths.

5°C / 41°F: cold hands. 15°C / 59°F: light-jacket territory. 25°C / 77°F: lunch outside. Not rules for everyone’s wardrobe. Just a few places to start building a feel for the other scale.

New country, new weather app settings. The city names make sense immediately. The temperatures take a little longer. That’s the bit Aha helps you practise.

Aha has a very small ambition for your next trip: let you complain about the temperature in either scale without doing maths first.

“It’s only 20 degrees” is either picnic weather or a reason to stay inside. Moving between °C and °F means relearning the casual bits of conversation, too.

Moving abroad milestone: the forecast says 14°C and you grab a jacket without opening a converter. Not fluent in the language yet. Getting fluent in the weather.

10°C: a chilly walk. 20°C: a picnic possibility. 30°C: find the shade. Start with a few temperatures you can picture. The numbers in between get less mysterious.

You can know the Celsius formula and still have no idea what to wear. That's the gap Aha is built for: turning an unfamiliar temperature into a feeling, not another calculation.

Weather small talk in a new country has an extra step: everyone else says “28 tomorrow” and groans. You’re still working out whether to join in.

We're building Aha around a small test: when you see a temperature in your unfamiliar scale, can you picture stepping outside? Not calculate it. Picture it.

The tricky part of learning Celsius is trusting that 18 can be a perfectly nice day. Your old scale keeps trying to have the last word.

A tiny moving-abroad milestone: someone says “it’s dropping to 12 tomorrow” and you reach for a jacket instead of your phone.

10°C: hands in pockets. 20°C: pockets optional. 30°C: why did I wear trousers? Not a conversion chart. Just a few feelings to hang the numbers on.

A weather forecast is a dress code written in numbers. Moving somewhere that uses the other scale means learning the dress code all over again.

The goal with Aha is not to make you faster at multiplying by 1.8. It is to make 16°C mean something before you reach for a calculator.

Moving abroad gives you a surprisingly specific homework assignment: learn which numbers mean you can eat outside.

18°C and 28°C are only one digit apart. One is a light-jacket day; the other has you looking for shade. Learning Celsius is mostly learning which little changes are not little.

Weather small talk is easy until someone says “only 12 degrees” and you have to work out whether you’re both complaining.