Climate science, data, & quality analysis. Independent, non-governmental, open-source.
Berkeley, CA USA
Joined July 2013
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Berkeley Earth retweeted
Join us tomorrow at @BerkeleyEarth for our monthly weather and climate update.
A record-breaking El Niño is rumbling and the rest of 2026 is poised to challenge records.
8 AM PT / 11 AM ET / 5 PM CET
docs.google.com/spreadsheets…
Geared for journalists, but all are welcome.
Berkeley Earth retweeted
I just signed an executive order permanently declaring Artificial Intelligence “Artificial Intelligence” in California.
You’re welcome, America.
Berkeley Earth retweeted
Berkeley Earth will be holding our monthly climate briefing on Thursday.
Safe to say that there is a lot going on with weather and climate the moment.
8 AM PT / 11 AM ET / 5 PM CET
It is geared towards the media, but anyone is welcome.
us02web.zoom.us/webinar/regi…
Berkeley Earth retweeted
We will be having our Berkeley Earth monthly press briefing tomorrow at 8 AM Pacific, covering July global temperatures, the rapidly developing El Nino event, and what to expect for the remainder of 2026 and for 2027.
Register here to join: us02web.zoom.us/webinar/regi…
Berkeley Earth retweeted
Apologies for the late notice, but @BerkeleyEarth will be holding our monthly climate press briefing looking at May temperatures starting in about 30 minutes.
We'll also include some discussion of the current European heatwave.
Registration link: us02web.zoom.us/webinar/regi…
Berkeley Earth retweeted
One frequently sees headlines that X is warming faster than the global average.
That's true of nearly everywhere that humans live, but only because humans nearly all live on land.
The process of global warming will generally warm land faster than the oceans.
Berkeley Earth retweeted
The transition last year from the old @BerkeleyEarth temperature analysis to the new high-resolution version doesn't make much difference for the global averages, but it is really useful when it comes to capturing local and regional details that would otherwise be missed.
Berkeley Earth retweeted
The current heatwave in the US Southwest is utterly destroying many records for this time of year.
Phoenix, Arizona has ~90 years of daily temperature data, and yet recent temperatures beat the previous March record by 5 °F (2.8 °C), and would actually tie the record for April.
Berkeley Earth retweeted
For 50 years, global warming had a very consistent trend (+0.19 °C/decade) with a boring, predictable range of natural variations around it.
During the last three years, we've broken out above that range, suggesting the pace of change has quickened.
Berkeley Earth retweeted
While the world sometimes seems metaphorically on fire right now, global warming is still progressing as well.
In 2025, global warming delivered the 3rd warmest year since measurements began. A modest step down from 2024's records, but still well above 20th century norms.
Berkeley Earth retweeted
September 2025 was the third warmest on record in the Berkeley Earth dataset. But this downplays how anomalous it was; without 2023 and 2024 this year would have been well above any prior records and well above the long-term trend:
Berkeley Earth retweeted
The Northern Pacific Ocean is currently smashing temperature records.
And it is reaching these levels far earlier than the current generation of climate models had expected.
A short thread 🧵
Berkeley Earth retweeted
The argument that urban heat islands are biasing temperature records continually comes up. There is a long history of papers showing it's effect minimal globally (and the world is 70% oceans with no urbanization). My colleague @RARohde has a neat updated analysis for global land: xitter.cf/RARohde/status/1937092…
Berkeley Earth retweeted
One of the most essential tests of science is reproducibility.
For this chart, I separated our weather station archive into 20 independent 5% samples and computed the global land average of each.
The samples vary a bit, but each one paints a similar picture of warming.
Berkeley Earth retweeted
I just published an explainer on aerosols and their role in the climate that I've been working on for the past few months! It includes both how aerosols work, how emissions have changed, and how thats driven recent warming (link below).
Berkeley Earth retweeted
Tomorrow will be the second press briefing in @BerkeleyEarth's new series discussing the monthly temperature report.
us02web.zoom.us/webinar/regi…
So if you want to learn a bit about how weather & climate have been evolving, join us.
Designed for journalists, but open to anyone.
Berkeley Earth retweeted
🚨 In one of the first direct blows to climate data, the National Snow and Ice Data Center is warning that they may discontinue updates to their sea ice data set.
Sea ice extent monitoring is a globally significant climate indicator and something I use directly in my work.
NSIDC announce a downgrading of service level for their sea ice index dataset which may mean no further updates.
These are globally important datasets for monitoring the ongoing changes to the climate. This is horribly damaging for global science.
nsidc.org/data/user-resource…
Berkeley Earth retweeted
We will be trying something new at @BerkeleyEarth.
Alongside our written monthly climate report, we will be having a short press briefing (~10 mins with slides, followed by Q&A).
Tuesday April 15th, 11 AM ET / 8 AM PT / 5 PM CET
Register here:
us02web.zoom.us/webinar/regi…
Berkeley Earth retweeted
A pesar de estar en fase neutra de El Niño, julio de 2024 ha podido ser otro mes con récord de temperatura global.
Según @BerkeleyEarth, habrían sido 13 meses de récord y uno más igualándolo.
Según @NASAGISS, julio habría estado 0,02°C por encima del récord.
July 2024 Temperature Update
July 2024 ties July 2023 as the warmest July since instrumental measurements began
Warmest July on land, 2nd warmest in the oceans
La Niña expected in coming months
Very likely 2024 will be a new warmest year
berkeleyearth.org/july-2024-…
🧵
Berkeley Earth retweeted
The carbon cycle has been close to equilibrium through the Holocene; we know this because we measure atmospheric CO2 concentrations in ice cores. But in the past few centuries CO2 has increased by 50%, and is now at the highest level in millions of years due to human emissions.
