JMA Data: Winter Global Warming Left Japan Decades Ago, No Warming In 32 Years

By Kirye
and Pierre

The meteorological winter, defined as December 1 to February 28, has just ended and the data for mean winter temperature are available for the Pacific island nation of Japan.

The question on everyone’s mind is: Are winters getting colder, or are they getting milder like the media like having us believe they are?

Tokyo winters see no warming in 35 years

Today we begin by plotting the mean DJF winter temperature for Tokyo going back more than 35 years, using the untampered data from the Japan Meteorological Agency (JMA):

jma data winter global warming left japan decades ago no warming in 32 years - JMA Data: Winter Global Warming Left Japan Decades Ago, No Warming In 32 Years

Source: JMA.

The mean winter temperature in Tokyo has not warmed at all. If we start the plot in 1988, i.e. exclude the colder 1985-87 winters,than we see that winters have gotten a bit harsher.

Hachij?-jima island no winter trend in decades

Next, also using the data from the JMA, we plot the mean annual temperature of the Tokyo island of Hachij?-jima, located about 287 kilometers south of Tokyo – away from  urban sprawl and heat island affects:


jma data winter global warming left japan decades ago no warming in 32 years 1 - JMA Data: Winter Global Warming Left Japan Decades Ago, No Warming In 32 Years

Data: JMA

Though the past two winters have been mild, the winter trend since 1948 at Hachij?-jima has been cooling. No warming going on here.

No annual trend either

Recently we looked at the mean annual temperature at Hachij?-jima going back to 1950 and found there’s been no warming and that its climate appears to be dominated by natural and cyclic forces.

Japan winters not warming

And what about the entire island country of Japan as a whole? Have winters there become colder or warmer over the recent decades? Here’s the plot of Japan mean winter temperatures going back 32 years:

jma data winter global warming left japan decades ago no warming in 32 years 2 - JMA Data: Winter Global Warming Left Japan Decades Ago, No Warming In 32 Years

Source: JMA.

Over the past 32 years, Japan’s mean winter temperatures have cooled modestly despite the past 4 of 5 winters having been mild.

It appears that global warming left Japan decades ago.

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