Home/BlogThe Version 6.1 global average lower tropospheric temperature (LT) anomaly for July, 2025 was +0.36 deg. C departure from the 1991-2020 mean, down from the June, 2025 anomaly of +0.48 deg. C.
The Version 6.1 global area-averaged linear temperature trend (January 1979 through July 2025) remains at +0.16 deg/ C/decade (+0.22 C/decade over land, +0.13 C/decade over oceans).
The 0.12 deg. C drop in global average temperature anomaly since last month was dominated by the extra-tropical Southern Hemisphere, which fell from +0.55 deg. C in June to +0.10 deg. C in July.
The following table lists various regional Version 6.1 LT departures from the 30-year (1991-2020) average for the last 19 months (record highs are in red).
| YEAR | MO | GLOBE | NHEM. | SHEM. | TROPIC | USA48 | ARCTIC | AUST |
| 2024 | Jan | +0.80 | +1.02 | +0.58 | +1.20 | -0.19 | +0.40 | +1.12 |
| 2024 | Feb | +0.88 | +0.95 | +0.81 | +1.17 | +1.31 | +0.86 | +1.16 |
| 2024 | Mar | +0.88 | +0.96 | +0.80 | +1.26 | +0.22 | +1.05 | +1.34 |
| 2024 | Apr | +0.94 | +1.12 | +0.76 | +1.15 | +0.86 | +0.88 | +0.54 |
| 2024 | May | +0.78 | +0.77 | +0.78 | +1.20 | +0.05 | +0.20 | +0.53 |
| 2024 | June | +0.69 | +0.78 | +0.60 | +0.85 | +1.37 | +0.64 | +0.91 |
| 2024 | July | +0.74 | +0.86 | +0.61 | +0.97 | +0.44 | +0.56 | -0.07 |
| 2024 | Aug | +0.76 | +0.82 | +0.69 | +0.74 | +0.40 | +0.88 | +1.75 |
| 2024 | Sep | +0.81 | +1.04 | +0.58 | +0.82 | +1.31 | +1.48 | +0.98 |
| 2024 | Oct | +0.75 | +0.89 | +0.60 | +0.63 | +1.90 | +0.81 | +1.09 |
| 2024 | Nov | +0.64 | +0.87 | +0.41 | +0.53 | +1.12 | +0.79 | +1.00 |
| 2024 | Dec | +0.62 | +0.76 | +0.48 | +0.52 | +1.42 | +1.12 | +1.54 |
| 2025 | Jan | +0.45 | +0.70 | +0.21 | +0.24 | -1.06 | +0.74 | +0.48 |
| 2025 | Feb | +0.50 | +0.55 | +0.45 | +0.26 | +1.04 | +2.10 | +0.87 |
| 2025 | Mar | +0.57 | +0.74 | +0.41 | +0.40 | +1.24 | +1.23 | +1.20 |
| 2025 | Apr | +0.61 | +0.77 | +0.46 | +0.37 | +0.82 | +0.85 | +1.21 |
| 2025 | May | +0.50 | +0.45 | +0.55 | +0.30 | +0.15 | +0.75 | +0.99 |
| 2025 | June | +0.48 | +0.48 | +0.47 | +0.30 | +0.81 | +0.05 | +0.39 |
| 2025 | July | +0.36 | +0.49 | +0.23 | +0.45 | +0.32 | +0.40 | +0.53 |
The full UAH Global Temperature Report, along with the LT global gridpoint anomaly image for July, 2025, and a more detailed analysis by John Christy, should be available within the next several days here.
The monthly anomalies for various regions for the four deep layers we monitor from satellites will be available in the next several days at the following locations:
This month’s post is of great importance. It shows strong empirical evidence that the earth’s energy transport process, aka the climate system, is dynamically stable. This is saying that, after the 2023 – 2024 strong water vapour and temperature perturbation, the July point shows regression towards the expected trajectory. A similar regression was evident in response to the 1998 perturbation.
This means that the warmista Hansen–Schlesinger–IPCC fable of “amplification through positive feedback by the radiative effect of increased water vapour” does not occur in nature. The “amplifier” is shown to be fake. The true dynamics of the process has no amplification.
This shows that the feedback, properly defined (not as the warmistas bizarrely or perversely define it), is negative. The whole warmista doctrine is blown away by this empirical observation.
Congratulations, Dr Spencer, on your magnificent and decisive assembly of empirical data.
A single month’s anomaly says very little in terms of trends or amplification. Like any other month,this anomaly falls well within the normal variability, and is well within the envelope of the long term positive trend.
Thank you, barry, for your comment. Yes, a single month’s anomaly, considered by itself, says little. But we are looking at a time series. The trend on the relevant time scale for water vapour feedback, shows, as you observe, a return to the “normal”, and is well within the envelope of the longer term positive trend. That is the point. If there were positive feedback, it would have shown itself as a persisting growth of the perturbation. We don’t know the cause of the longer term positive trend, but we don’t need to for this analysis. What matters here is that it wasn’t disrupted by an explosive extension of the perturbation that started in 2022 or 2023. The proposed “amplification” is said to arise from “positive feedback”, which the new data rule out when the sign is defined according to the natural definition.
Good point, Christopher.
It’s a correction after the perturbation. Earth can handle it.
I was curious if the fall would be as rapid as the rise.
If the La Niña returns we could even see the global anomaly get back to 0.0!
The proper way to define dynamical stability in the present context is through dynamical systems theory (e.g. ‘Dynamical Systems’ by G.D. Birkhoff (1927), American Mathematical Society, Providence, RI). All the eigenvalues of the matrix of rate coefficients must be negative (or, exceptionally, if complex, must have negative real parts). A single positive eigenvalue will make the process dynamically unstable.
That is a rather theoretical definition, which we can’t directly verify, because we don’t well enough understand the details of the dynamics.
The appropriate empirical definition, according to dynamical systems theory, is that, for dynamical stability, a substantial perturbation should always be followed by a rapid return to the currently expected trajectory of the process. Such a return signifies negative feedback.
On the other hand, positive feedback as defined above would have resulted in a rapid extension of the perturbation. Instead, this month’s new data rule out positive feedback.
Looks like I was correct in saying that https://oz4caster.wordpress.com/wp-content/uploads/2025/08/d1-gfs-gta-daily-2025-08-01.gif would well predict the outcome of UAH global temperatures.
In 1937, Soviet census officials were disappeared for reporting numbers Stalin didn’t like.
In 2025, Trump fired the head of the Bureau of Labor Statistics because the jobs numbers made him look bad.
Different century, same instinct: if the facts don’t flatter the regime, shoot the messenger and burn the ledger.
I think that makes this the 4th warmest July in the UAH record. Well down on the last two years, and slightly below 1998.