Home/BlogThe Version 6 global average lower tropospheric temperature (LT) anomaly for September, 2024 was +0.96 deg. C departure from the 1991-2020 mean, up from the August, 2024 anomaly of +0.88 deg. C.
The linear warming trend since January, 1979 remains at +0.16 C/decade (+0.14 C/decade over the global-averaged oceans, and +0.21 C/decade over global-averaged land).
The following table lists various regional LT departures from the 30-year (1991-2020) average for the last 21 months (record highs are in red):
| YEAR | MO | GLOBE | NHEM. | SHEM. | TROPIC | USA48 | ARCTIC | AUST |
| 2023 | Jan | -0.04 | +0.05 | -0.13 | -0.38 | +0.12 | -0.12 | -0.50 |
| 2023 | Feb | +0.09 | +0.17 | +0.00 | -0.10 | +0.68 | -0.24 | -0.11 |
| 2023 | Mar | +0.20 | +0.24 | +0.17 | -0.13 | -1.43 | +0.17 | +0.40 |
| 2023 | Apr | +0.18 | +0.11 | +0.26 | -0.03 | -0.37 | +0.53 | +0.21 |
| 2023 | May | +0.37 | +0.30 | +0.44 | +0.40 | +0.57 | +0.66 | -0.09 |
| 2023 | June | +0.38 | +0.47 | +0.29 | +0.55 | -0.35 | +0.45 | +0.07 |
| 2023 | July | +0.64 | +0.73 | +0.56 | +0.88 | +0.53 | +0.91 | +1.44 |
| 2023 | Aug | +0.70 | +0.88 | +0.51 | +0.86 | +0.94 | +1.54 | +1.25 |
| 2023 | Sep | +0.90 | +0.94 | +0.86 | +0.93 | +0.40 | +1.13 | +1.17 |
| 2023 | Oct | +0.93 | +1.02 | +0.83 | +1.00 | +0.99 | +0.92 | +0.63 |
| 2023 | Nov | +0.91 | +1.01 | +0.82 | +1.03 | +0.65 | +1.16 | +0.42 |
| 2023 | Dec | +0.83 | +0.93 | +0.73 | +1.08 | +1.26 | +0.26 | +0.85 |
| 2024 | Jan | +0.86 | +1.06 | +0.66 | +1.27 | -0.05 | +0.40 | +1.18 |
| 2024 | Feb | +0.93 | +1.03 | +0.83 | +1.24 | +1.36 | +0.88 | +1.07 |
| 2024 | Mar | +0.95 | +1.02 | +0.88 | +1.35 | +0.23 | +1.10 | +1.29 |
| 2024 | Apr | +1.05 | +1.25 | +0.85 | +1.26 | +1.02 | +0.98 | +0.48 |
| 2024 | May | +0.90 | +0.98 | +0.83 | +1.31 | +0.38 | +0.38 | +0.45 |
| 2024 | June | +0.80 | +0.96 | +0.64 | +0.93 | +1.65 | +0.79 | +0.87 |
| 2024 | July | +0.85 | +1.02 | +0.68 | +1.06 | +0.77 | +0.67 | +0.01 |
| 2024 | Aug | +0.88 | +0.96 | +0.81 | +0.88 | +0.69 | +0.94 | +1.80 |
| 2024 | Sep | +0.96 | +1.21 | +0.71 | +0.97 | +1.56 | +1.54 | +1.16 |
The full UAH Global Temperature Report, along with the LT global gridpoint anomaly image for September, 2024, and a more detailed analysis by John Christy, should be available within the next several days here.
Lower Troposphere:
http://vortex.nsstc.uah.edu/data/msu/v6.0/tlt/uahncdc_lt_6.0.txt
Mid-Troposphere:
http://vortex.nsstc.uah.edu/data/msu/v6.0/tmt/uahncdc_mt_6.0.txt
Tropopause:
http://vortex.nsstc.uah.edu/data/msu/v6.0/ttp/uahncdc_tp_6.0.txt
Lower Stratosphere:
http://vortex.nsstc.uah.edu/data/msu/v6.0/tls/uahncdc_ls_6.0.txt
Roy, this is clearly a step-up that has to be questioned. Have you found any reason that this could occur?
If we ever find out I’m pretty sure it will be a combination of factors, rather than one geological finger on the scale.
September was a battle between the developing La Niña and the residual HTE.
The HTE will continue to dissipate. So as La Niña fully forms temperatures should drop.
I disagree that this is “clearly a step-up that has to be questioned” in that it is reasonably within the month to month variability typical of this dataset. The expectation certainly is that UAH anomalies will tend downward with the probable La Nina in the coming months, but it’s too early to declare another month at or near the peak from the recent El Nino as a wild outlier.
There has been some discussion of the peak being attributed to contributions from El Nino, Hunga Tonga, and the marine sulphur emissions reductions, but the mainstream consensus seems to be that the effect or forcing from these factors combined aren’t sufficient to explain the magnitude of the recent peak. It could be that the sensitivity to the one or both of the latter two is greatly underestimated, but implicitly arguing for greater sensitivity would ought to be uncomfortable for mitigation skeptics hoping to maintain some level of self-consistency.
Aside from the reduction in marine aerosol (sulfur) emissions, there has been a considerable reduction in aerosol pollution from Asia over the last decade or so. This is believed to have reduced the cooling effect of aerosols that has been partially cancelling the GHG warming.
This may be partly responsible for the persistent warm anomaly in the North Pacific.
https://www.science.org/content/article/deadly-pacific-blobs-tied-emission-cuts-china
Together with the quite warm N. Atlantic, the overall global sea surface temperature has continued its streak of record warmth.
https://climatereanalyzer.org/clim/sst_daily/?dm_id=world2
That’s the 15th straight new record warmest monthly temperature. Every month since July 2023 has set a new monthly temperature record. What on earth is going on? The 2023/24 El Nino ended in May.
I think the anomaly for the 3 remaining months in 2024 would have to average around -0.7C in order for 2024 not to surpass 2023 as the warmest year on record for UAH. Can’t see that happening.
That’s really surprising. I was expecting this month to be cooler that last September.
This makes 15 months in a row to set a monthly record. The ten warmest Septembers are now:
1 2024 0.96
2 2023 0.90
3 2019 0.46
4 2020 0.41
5 2017 0.40
6 2016 0.30
7 1998 0.27
8 2021 0.27
9 2022 0.25
10 2010 0.19
Interesting to see how much cooler the previous El Nino Septembers of 1998 and 2016 were.
My simplistic projection for 2024 is now 0.85 +/- 0.08. It’s difficult at this stage to see 2024 as not beating the 2023 record, the question is by how much. At present it look like beating the record by at least 0.25C.
September was the first month there was a noticeable drop after the 1998 El Nino. The big drop came in November.
But then, in September 1998 we were already well into La Nina, and approaching a strong one, with ENSO3.4 already down to -1.3. This September it will probably only be around -0.4.
(Someone here will now present the deprecated ENSO3.4 data graph instead of the official data, and without providing the 1998 data from that source for comparison.)
This is also the warmest USA September, just beating September 1998 at 1.50C. And the warmest Arctic September, beating last years 1.14C by some margin. Australia was 0.01C cooler than last year’s record September.
It’s also a record September for the Northern Hemisphere, beating last year’s record by 0.27C.
Here is the Monckton Pause update for September. At its peak it lasted 107 months starting in 2014/06. Since 2014/06 the warming trend is now +0.42 C/decade.
Here are some more trends
1st half: +0.14 C.decade-1
2nd half: +0.23 C.decade-1
Last 10 years: +0.41 C.decade-1
Last 15 years: +0.39 C.decade-1
Last 20 years: +0.30 C.decade-1
Last 25 years: +0.23 C.decade-1
Last 30 years: +0.17 C.decade-1
The acceleration is now at +0.03 C.decade-2.
I’m afraid I’m going to have to cross the floor on this one and point out how meaningless a 10-year trend is in terms of having a predictive value.
I don’t disagree but Monckton made a big stink about how the warming had paused (and interpreted by many as an outright stoppage) by considering only the last <9 years in his monthly updates. I'm pointing out that since the start of his cherry picked pause the warming rate is now even higher than that of the overall trend.
It is also interesting to note that the warming trend up to 2014/06 (the start of his pause) was only +0.11 C.decade-1. And if we include the 107 months of the pause it is actually +0.14 C.decade-1. So his pause actually increased the overall warming rate. Simpson's Paradox.
If the point is to shine light on Monckton’s lunacy then it is a point well made. Unfortunately this new peak will only serve to reset the baseline for a new instalment of his nonsense.
WUWT lost its credibility long ago when they discredited Berkeley Earth after it reported results consistent with other surface datasets. If I remember correctly, Watts said he would accept the result no matter.
I’m sure predictive value was not bdgwx’s point.
bdgwx says: ”The acceleration is now at +0.03 C.decade-2.”
Natural climate change via orbital forcing at its finest. It was bound to reveal itself on the solar system scale of time and here it is folks! this is not CO2 its not ENSO, in fact it seems to have been killing ENSO seasonal forecasts dating back to January.
time to wake up and address natural climate change via orbital forcing! there hasn’t been a big poof of CO2 that could account for it but there clearly is a planetary alignment.
“Natural climate change via orbital forcing at its finest.”
Fantasy that cannot be supported with actual science. Oh well..
What science is available on the matter says otherwise Nate. Orbital forcing is real and is taught at a high level in the universities. What they don’t look at because of corruption is the eccentricity clock has much more than one hand on it.
I think that everybody here will agree that orbital forcing exists. The question is: what makes you so sure that the warming we’ve seen recently has been caused by orbital forcing?
Can you point us to any research from a few years ago that predicted orbital forcing to cause this amount of warming?
Nah,you have not made a convincing science based argument. Until you do, this is Astrology.
September was also the 2nd highest anomaly in the entire dataset, beaten by April at 1.05 C.
Truly a remarkable couple of years in the record. I’d question the instruments or processing of the data, but GSAT corroborates (it will be interesting to see the September anomalies for the surface datasets). This is a ‘Tenberth’ moment, where we can’t yet account for the distribution of energy to make sense of this.
barry, are you pretending you never heard of the HTE?
I was pinning the step up on HTE. But why the lag?
Are we puzzling over the lack of a step down from a mighty step up, when we should be wondering why 2020 to 2023 was so cool? Global airline traffic plummeted during that time. Perhaps contrails cause warming…
What is HTE?
luke, HTE is the “Hunga-Tonga Effect”. It was caused by the huge underwater volcano that launched millions of gallons of water into the Stratosphere. The combined effect includes atmospheric waves that disrupted the Polar Vortex, a REAL greenhouse effect from the water vapor, and possible yet-to-be determined effects from the chemistry of chlorine and ozone.
The atmospheric waves have subsided, but the water vapor has been slow to leave the Stratosphere.
Such a massive underwater eruption has not been observed in modern satellite times, so it’s a learning experience.
The only consequence of a ‘Tenberth’ moment is that you will be able to successfully and consistently grow crops 1 degree latitude further North.
‘Climate crisis’ is not evident in any salient data.
Oh, and more extremely damaging events like Helene.
And Rising Tree Cover Loss Amid Increasing Forest Fires: https://ibb.co/JqBD6HG
There is no way to attribute Helene to climate crisis narrative.
There is no trend in fire data. The paleological data suggests that there have always been more fires than there are now as a result of fire suppression efforts.
Yes there is a trend.
Data on forest fires reveals that they now consume at least twice as much tree cover as they did 23 years ago. In this context, “loss due to fires” refers to the direct loss of tree canopy cover caused by both natural and human-ignited fires.
Fire is also making up a larger share of global tree cover loss compared to other drivers like mining and forestry. Fires only accounted for about 20% of all tree cover loss in 2001, they now account for roughly 33%.
https://ibb.co/JqBD6HG
Climate change is a key factor driving the increase in fire activity, as rising temperatures dry out landscapes, creating conditions that are more favorable for larger and more frequent forest fires.
I think your brain is Heavily Saturated with bad information.
The global sea surface temperature is back to breaking records, even with the cooler central Pacific. Suggests we have may entered a new normal of elevated ocean temps.
https://climatereanalyzer.org/clim/sst_daily/?dm_id=world2
Tellingly, they haven’t been updated for a week because the data center is in Asheville, NC, destroyed by Hurricane Helene.
WHAT IS THE MONCTON PAUSE?
Skewed. Broke. No Explanation.
Andrew
You’ve mentioned this every month but haven’t provided any evidence to support your claims. How do you account for the corroboration of this anomaly with the surface datasets?