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Warming stripes show over 100 years of climate change at a glance

Monday, June 21st 2021, 6:04 pm - A British climatologist who wanted to illustrate climate change in a clear and simple way created the “warming stripes.” The overly simplified visual representation went viral.

Ed Hawkins from the University of Reading knows there are many sources of complex information that provide detailed evidence of climate change. His warming stripes, according to the #ShowYourStripes website, have a different objective: “These graphics are specifically designed to be as simple as possible, and to start conversations about our warming world.”

Put simply, the warming stripes are a chronological visual representation of “the change in temperature as measured in each country over the past 100+ years.” To achieve the illustration of the climate, Hawkins compared the average temperature of one year on Earth with the climatological average of the planet between 1971 and 2000 (this permitted a base average for comparisons).

stripes NORTH AMERICA-Canada-Nunavut-1901-2020 Warming stripes for Nunavut from 1901-2020. (Professor Ed Hawkins/University of Reading. CC BY 4.0)

For each year in which the average temperature is below the 1971–2000 average, he draws a vertical stripe with a bluish tint. If this temperature is higher than this same average, then the illustration displays a red band—the darker the stripe, the cooler or warmer the year, compared to the base average. Arranging all the colored bands side by side gives you a quick overview of how the Earth's climate has changed over time.


Every year on June 21, the day of the summer solstice in the Northern Hemisphere, hundreds of weather presenters and meteorologists present their “warming stripes” to their audiences during daily bulletins and take the opportunity to raise awareness for climate change. This act draws upon the significance of the message behind Hawkins’s visual representation and the prevailing dialogue that identifies climate change as such a pressing issue.

stripes NORTH AMERICA-Canada-British Columbia-1901-2020-BK-withlabels Warming stripes for British Columbia from 1901-2020. (Professor Ed Hawkins/University of Reading. CC BY 4.0)

In 2015, when the Paris Agreement was signed, countries pledged to review their carbon dioxide emissions reduction targets every five years in order to mitigate the impacts. In 2020, this was to take place during the annual climate negotiations organized by the United Nations Conference of the Parties (COP).

Since COP26 was canceled due to the pandemic, important reduction conversations have been postponed until this year when the event is scheduled to occur in the city of Glasgow from November 1st-12th.

“Show Your Stripes Day” falls on June 21 to highlight the importance of the COP climate negotiations and underline the fact that this year is a pivotal year for the fight against climate change.

stripes NORTH AMERICA-Canada-Ontario-1901-2020-BK-withlabels Warming stripes for Ontario from 1901-2020. (Professor Ed Hawkins/University of Reading. CC BY 4.0)

To gain the much needed attention, the UNFCCC organized three round tables (in English, French, and Spanish) which consisted of international weather presenters discussing the art of communicating about climate change. These round tables will be accessible on all United Nations social media platforms on June 21.


Hawkins’s warming stripes have become so popular with meteorologists and weather presenters around the world, Hawkins was asked by climatologists to make local case studies depicting the warming trend for several countries. You can access the site and see the global warming of your country, your province, and in some cases, your city, here.

Thumbnail depicts Earth’s warming stripes from 1850-2020. (Professor Ed Hawkins/University of Reading. CC BY 4.0)

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