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Every Single Day of 2023 Was Extraordinarily Hot

Here are some more numbers from today’s big temperature announcement.

Jillian Goodman •
01/09/2024
Extreme heat.
Heatmap Illustration/Getty Images

You have almost certainly heard already that 2023 was, officially, the hottest year on record. That announcement came this morning from Copernicus, the European Union’s Earth data service.

There was another figure in that announcement, however, that caught my eye: 2023 was also the first year in which every single day was at least 1 degree Celsius hotter than the pre-industrial average.

Chart of 2023 daily average temperatures relative to pre-industrial average.

That is a marked contrast to 2022, our sixth hottest year on record, which had several days less than 1 degree above the pre-industrial average and a maximum temperature difference around half a degree lower than last year’s.

Chart of 2022 daily average temperatures relative to pre-industrial average.

Just for kicks, I decided to make the same chart for 1940, the earliest year represented in this particular dataset. As you will perhaps notice, I had to adjust the scale to account for temperatures below the pre-industrial average.

Chart of 2022 daily average temperatures relative to pre-industrial average.

The last time the global daily average temperature came in below the pre-industrial average, according to the Copernicus data, was October 8, 1992.

Jillian Goodman profile image

Jillian Goodman

Jillian is Heatmap's deputy editor. Before that, she was opinion editor at The Information and deputy editor at Bloomberg Green.

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Sparks

Interior Department Targets Wind Developers Using Bird Protection Law

A new letter sent Friday asks for reams of documentation on developers’ compliance with the Bald and Golden Eagle Protection Act.

Jael Holzman •
08/11/2025
An eagle clutching a wind turbine.
Heatmap Illustration/Getty Images

The Fish and Wildlife Service is sending letters to wind developers across the U.S. asking for volumes of records about eagle deaths, indicating an imminent crackdown on wind farms in the name of bird protection laws.

The Service on Friday sent developers a request for records related to their permits under the Bald and Golden Eagle Protection Act, which compels companies to obtain permission for “incidental take,” i.e. the documented disturbance of eagle species protected under the statute, whether said disturbance happens by accident or by happenstance due to the migration of the species. Developers who received the letter — a copy of which was reviewed by Heatmap — must provide a laundry list of documents to the Service within 30 days, including “information collected on each dead or injured eagle discovered.” The Service did not immediately respond to a request for comment.

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Solar for All May Be on the Chopping Block After All

The $7 billion program had been the only part of the Greenhouse Gas Reduction Fund not targeted for elimination by the Trump administration.

Emily Pontecorvo •
08/05/2025
The EPA blocking solar power.
Heatmap Illustration/Getty Images

The Environmental Protection Agency plans to cancel grants awarded from the $7 billion Solar for All program, the final surviving grants from the Greenhouse Gas Reduction Fund, by the end of this week, The New York Times is reporting. Two sources also told the same to Heatmap.

Solar for All awarded funds to 60 nonprofits, tribes, state energy offices, and municipalities to deliver the benefits of solar energy — namely, utility bill savings — to low-income communities. Some of the programs are focused on rooftop solar, while others are building community solar, which enable residents that don’t own their homes to access cheaper power.

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Grassley Holds Up Trump Treasury Nominees to Protect Renewables Development

Along with Senator John Curtis of Utah, the Iowa senator is aiming to preserve the definition of “begin construction” as it applies to tax credits.

Matthew Zeitlin •
08/04/2025
John Curtis and Charles Grassley.
Heatmap Illustration/Getty Images

Iowa Senator Chuck Grassley wants “begin construction” to mean what it means.

To that end, Grassley has placed a “hold” on three nominees to the Treasury Department, the agency tasked with writing the rules and guidance for implementing the tax provisions of the One Big Beautiful Bill Act, many of which depend on that all-important definition.

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