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

Monthly Highlights on the Climate System

'Monthly Highlights on the Climate System' has been issued in PDF format since March 2007 as a monthly bulletin focusing on the monthly highlights of the monitoring results.

Highlights in May 2017

- Monthly mean temperatures were significantly above normal and monthly precipitation amounts were below normal in northern to western Japan.
- The monthly anomaly of the global average surface temperature was the third warmest since 1891.
- In the equatorial Pacific, positive SST anomalies were dominant except around 170°E and 100°W.
- Convective activity was enhanced from the central Indian Ocean to the Maritime Continent.
- The subpolar jet stream was clearly seen over Eurasia. The subtropical jet stream over Asia was displaced southward from its normal position.


Full version (PDF)

The descriptions until April 2011 are based on the old normal (i.e., the 1979 - 2004 average).
The descriptions until January 2014 are based on the JRA-25/JCDAS datasets.

Figures and Tables



If you would like to subscribe to Monthly Highlights on the Climate System, please send an email to

with your name, affiliation, country and email address.
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Tokyo Climate Center, Climate Prediction Division, 1-3-4 Otemachi, Chiyoda-ku, Tokyo, Japan.
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