Is Japan's humidity really that bad

The climate in Japan

Average day and night temperatures

All climate diagrams on this page result from the collected data from 78 measuring stations in Japan.
Weather stations at an altitude of 610m were no longer taken into account.
All data correspond to the average monthly values ​​for the last 20 years.

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Climate charts for other prefectures in Japan

Temperature records for the past 147 years

The hottest temperature measured from 1873 to October 2020 was reported by the Nagoya weather station. In August 2018, the record temperature of 40.3 ° C was reported here. The hottest summer from July to September, based on all 62 weather stations in Japan below 610 meters altitude, was recorded in 2010 with an average of 25.7 ° C. This average temperature is usually recorded every 4 to 6 hours, including the nights. Normally this value is 23.7 degrees Celsius. The average maximum daily temperature at that time was 29.6 ° C.

The Asahikawa weather station reported the coldest day in these 147 years. Here the temperature dropped to -25.7 ° C in January 2008. Asahikawa lies at an altitude of 140 meters above sea level. The coldest winter (January to March) was in 1875 with an average of -0.7 ° C. In Japan it is usual to have about 5.8 degrees more at 5.1 ° C for this three-month period.

Long-term development of temperatures from 1920 to 2019

In contrast to individual record values, a long-term development cannot simply be brought about over all weather stations in the country. Both the number and the locations are constantly changing. A simply calculated average value would produce a falsified result. If several measuring stations are added in a year in particularly cold mountain or coastal regions, this alone would reduce the average. If a station fails over the summer or winter months, it does not provide any values ​​and falsifies the average again. The subsequent long-term development was therefore reduced to only 24 measuring points in order to actually have comparable data over the longest possible period.

From 1920 to 2019 there were only these 24 weather stations in the whole country that continuously reported temperature values. From these weather reports we have created a long-term development that shows the monthly average temperatures. The hottest month in this entire period was 2010 with 27.1 ° C. 1922 was the coldest month with an average of -0.5 ° C.

The annual average temperature was around 12.8 ° C in the years after 1920 and around 14.6 ° C in the last years before 2019. So it has increased by about 1.8 ° C in less than 100 years. However, this tendency only applies to the selected 24 weather stations in Japan. We have provided a considerably more extensive evaluation of the global temperature rise separately.

You can find more detailed information on global warming with a view by continent on our topic page on climate change. Database: German weather service, individual values ​​averaged and supplemented with your own elements.
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