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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 February 2018

- It is considered that La Niña conditions continue in the equatorial Pacific (see El Niño Outlook updated on 9 March 2018).
- Monthly mean temperatures were below normal all over Japan and there was a record-breaking heavy snowfall in some regions on the Sea of Japan side.
- Monthly mean temperatures were extremely low in and around the northwestern USA, and from the southern UK to western Germany.
- The active phase of equatorial intraseasonal oscillation propagated eastward from the central Pacific to the western Indian Ocean.
- In the 500-hPa height field, the polar vortex in the Northern Hemisphere split into the East Siberian part and the North American part associated with positive height anomalies in and around the North Pole.
- Temperatures at 850-hPa were widely above normal over the Arctic Ocean, and below normal over East Asia, the northern part of North America and Europe.

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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