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Welcome to the TopHeAT surface temperature mapper

by termatics

This map shows surface temperature measured from satellites: how hot the land itself gets, at 30 m detail, across eleven regions on both sides of the Austrian-Hungarian border, through the summers of the last 11 years.

These are surface temperatures, not air temperatures. Every 30 m pixel averages a whole block or field, so what the map really tracks is land cover: sealed, impervious ground runs hot because there is no moisture left to evaporate, while vegetation and water stay cool through evapotranspiration. That contrast is the signal worth reading.
The five views
HourlyA single day, hour by hour. Hit Play day to watch the heat build and fade.
SUHIThe summer average: where a town runs hotter than the countryside around it, by day, by night, and how far it swings between the two.
HeatwavesMulti-day extreme-heat events that actually happened. Click a card to load that event onto the map.
Hot DaysHow many unusually hot days each spot got in a given year.
Heat IndexA combined heat-exposure score, ranked from the coolest tenth of the area to the hottest.
Finding your way around
• Jump to a town with Navigate to Region, or switch on Place names under Color & Overlay to label the map itself.
• Click anywhere on the map to drop a probe (up to six) and read its temperature curve in the chart below.
• The Opacity slider fades the heat layer back to reveal the satellite image underneath.
• Not enough contrast? Type your own min and max °C into the colour range boxes to stretch the scale over the values you care about, or press Auto to snap back to the default for that view.
Reopen this anytime with ? Info, top-right of the map.
CITY HEAT TIMELINEclick an event to focus the map