June In Tokyo, Hachijojima Island Hasn’t Warmed In Decades

Charts by Kirye

The mean temperature data for June are available from the Japan Meteorological Agency (JMA) and today we plot the June mean temperature data for Tokyo and its Hachijojima island, located in the middle of the ocean 287 kilometers south of Tokyo.

June in urban Tokyo hasn’t warmed since 1996:

Data source: JMA

For rural Hachijojima Island, June hasn’t warmed there since 1936:

Data source: JMA

Next we compare the mean daily maximum temperatures of urban Tokyo and rural Hachijojima and see strong evidence of the urban heat island effect:

Data source: JMA here and here

While the mean daily maximum temperature for Hachijojima has risen modestly over the past 115 years, Tokyo has seen an almost 2°C linear trend increase.

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July 3, 2022 at 01:32PM

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