Number Of Hot Days In Tokyo Falls Modestly Over Past 24 Years…Also Tokyo October Cooling Slightly

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By Kirye
and Pierre Gosselin

As urban expansion continues worldwide, it wouldn’t surprise anyone that cities would see a growing number of hot days as asphalt, concrete, steel and automobiles act as heat sinks that absorb the summer sun’s energy, a phenomenon known as the urban heat island effect (UHI).

Indeed this has been the case for many German cities over the past decades. Though he climate in Europe has changed over the past 30 years, that change is likely due to natural cyclic pattern changes.

Tokyo not seeing hotter summer highs

But even with a stronger UHI and supposed climate warming, Japan’s sprawling megalopolis of Tokyo has not seen an increase in the number of hot days (days where the thermometer climb to 30°C or higher), as the following chart clearly depicts:

Chart shows the number of days each year (May 1st to October 31st) where the temperature rose to 30°C or more in Tokyo. Data source: Japan Meteorological Agency (JMA). 

Clearly the number of hot days has little to do with CO2 emissions.

Tokyo October not warming

Also we’ve got the mean temperature data for October 2020 for Tokyo:

Data source: JMA

Above the chart shows that the mean October temperature in the city of Tokyo has not risen in almost 3 decades. In fact it has trended downward a bit, though statistically insignificantly.

So if anyone is claiming Tokyo is getting hotter days and hotter in general, then they either don’t know what they are talking about or they are misleading us.




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7 responses to “Number Of Hot Days In Tokyo Falls Modestly Over Past 24 Years…Also Tokyo October Cooling Slightly”

  1. jacqueshenry

    My younger son lives in Tokyo since 2006 in a residential area 20 km west of Shinjuku and he noticed that summers are less warm but more rainy besides the fact that typhoons are less abundant at least on Honshu. He noticed also that sakura blooming is delayed. Fourteen years is not enough to feel a climate change but let’s wait for this coming winter … If you look at the second illustration from Kirye the trend is in favor of a cooling at least in Tokyo.

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  5. ahlam st

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