Köppen
Understand your weather.
Interactive scenes of weather and climate, rendered from data only: storms, cold waves, El Niño, the climate zones of the world.
Now
Will it be white? The Christmas forecast for your place
Try it now
Three scenes, free to play. No account needed.
Climate Atlas
Isotherms
Thresholds
Heat and hardiness zones
Climate twins
Lothar: The pressure falls
Lothar: The swath
Lothar: The jet engine
Lothar: The vortex
Windstorm chronicle 1991–2025
North Atlantic windstorms
ENSO: The engine
El Niño: The chronicle
El Niño: The number
El Niño: The bill
El Niño: The mechanism
El Niño: The world
El Niño: The water tips
El Niño: The wave
Texas cold wave 2021
Uri: The vortex breaks
Uri: The descent
Uri: The dam breaks
Uri: The cold invasion
Uri: The weather map
Uri: The cold anomaly
Storm of the Century: Two jets become one
Storm of the Century: The snow carpet
The earliest tipping point
Warmth from above
Polar vortex: 10-day forecast
Polar vortex: The warm bubble
Hurricane tracks
The storm highway
White Christmas
Snow winter 2026/27
Series
Each series tells one event or one idea in several scenes.
- ClimateHow the world's climate has shifted since 1940: zones, lines and thresholds, computed from ERA5. 5
- Windstorm Lothar 1999On 26 December 1999 windstorm Lothar swept across France, Switzerland and southern Germany: how it formed and what it did. 6
- El NiñoA warm patch in the Pacific changes the weather of the whole world: the mechanics, history and cost of El Niño. 8
- Winter Storm Uri 2021In February 2021 Texas freezes: from the polar vortex breaking up to the blackout, step by step. 7
- Storm of the Century 1993In March 1993 a low over the Gulf of Mexico becomes the storm of the century, with snow from Alabama to Canada. 2
- Polar vortexThe vortex over the pole decides whether winters turn cold: its history since 1948 and the current forecast. 4
- Storms of the worldWhere the great storms of the world form and where they go. 2
- Holiday weatherWhat the weather was like on the days that matter: white Christmas, New Year's Eve, Easter, for every place since 1940. 1
- SeasonWhat the seasonal models expect for the coming winter. 1
One membership, all scenes
Every scene, your own place, the full time range, new episodes as they come.
€59 a year
or €7.90 a month
Become a memberCancel any time, access runs until the end of the period.