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HOME >Climate System Monitoring > Seasonal Highlights on the Climate System

Seasonal Highlights on the Climate System

'Seasonal Highlights' has been issued in PDF format since spring 2007 as a seasonal bulletin focusing on the seasonal highlights of the monitoring results. For monthly information, please refer to 'Monthly Highlights on the Climate System.'

Notice: From 19 May 2021 onward, the products in this page are based on the new climatological normal (1991-2020 average) unless otherwise stated.


Highlights in Autumn (September 2023 - November 2023)

- El Niño conditions have persisted in the equatorial Pacific since this boreal spring (see El Niño Outlook updated on 11 December 2023). A positive Indian Ocean Dipole event has persisted since this boreal summer.
- The seasonal anomaly of the average temperature over Japan was +1.39°C (the warmest for the season since 1898).
- The seasonal anomaly of the global average surface temperature was +0.75°C (the warmest for the season since 1891).
- Convective activity was enhanced over the equatorial Pacific and over the western Indian Ocean, and suppressed from the eastern Indian Ocean to Indonesia.
- In the 500-hPa height field, positive anomalies were seen over northern Central Siberia and the northern North Pacific, and negative anomalies were seen over the eastern North Pacific, from the eastern USA to northern Europe, and over Eastern Siberia.


Full version (PDF)

The descriptions from Spring-2011 to Winter-2021 issue are based on the former climatological normal (1981-2010) unless otherwise stated.
In the descriptions until Winter-2011 issue, 1979-2004 average is used as climatological normal unless otherwise stated.
The descriptions until Autumn-2013 issue are based on the JRA-25/JCDAS datasets.
The descriptions from Winter-2014 to Winter-2023 issue are based on the JRA-55 reanalysis.

Figures and Tables

Notice: OLR-related products updated from October 2023 onward are based on NOAA CPC Blended OLR (CBO).

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Tokyo Climate Center, Climate Prediction Division.
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