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News & Articles


Defining Heatwaves and Measuring Their Intensity: How the Historic 2003 Heatwave Could Become Commonplace in France
For planners, investors and policymakers, knowing when and where extreme heat will strike is crucial. Robust severity assessments is needed to offer a clearer view of potential impacts, yet heatwaves are complex and defined in many ways. This article presents a method from recent scientific research to measure severity and reveals how climate change is turning rare heatwaves into regular events.
Aug 125 min read


Designing for the Next Heatwave: How ClimateVision Helps Build Resilient Data Centers
Data center failures during the 2022 UK heatwave exposed a critical flaw in how we design infrastructure: relying on outdated weather data. As climate change make heatwaves more severe and more frequent, extreme temperature assumptions fall short. Discover how ClimateVision, Callendar’s climate impact tool, empowers operators with cutting-edge climate projections,making it easier to build heat-resilient infrastructure, anywhere in the world.
May 53 min read


Selecting a Bias Correction Method: A Case Study on Multivariate Indicators
Univariate bias-correction methods can distort multivariate indicators, such as heat indexes that combine temperature and humidity.
Apr 66 min read


Tutorial: Accessing ERA5-Land reanalyses and calculating a climate normal with Python
As soon as the temperature rises a little, the question comes up: it's hot, of course, but is it abnormally hot?
Nov 28, 20248 min read


Tutorial: understanding wet bulb temperature and calculating it with Stull's formula
What is the wet bulb temperature? Why is it often quoted during heatwaves? How do I use it with Python?
May 18, 20222 min read
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