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Number of Rainy Days in Tokyo

On average, we have 105 rainy days with more than 1 mm of rainfall in Tokyo.

The following figure shows the number of rainy days by year in Tokyo.

f:id:nbakki:20140730123435j:plain

In 1890 we had the most rainy days (145 days), and the number of 1943 was the least (73 days).

I do not think there is a trend in terms of the number of rainy days.

The figure below shows the number of rainy days by month in 2013.

f:id:nbakki:20140730123626j:plain

Source is Japan Meteorological Agency.

www.data.jma.go.jp/obd/stats/etrn/index.php

都府県・地方を選択 > 地点を選択 > 年ごとの値を表示 > 詳細(気圧・降水量)

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Table of Contents of Statistics/Rankings/Graphs is here.