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|Born||August 24, 1894|
|Died||January 22, 1981 (aged 86)|
|Known for||Köppen–Geiger climate classification|
Rudolf Oskar Robert Williams Geiger (//; German: [ˈɡaɪɡɐ]; August 24, 1894 – January 22, 1981) was a German meteorologist and climatologist. He was the son of Indologist Wilhelm Geiger and the brother of physicist Hans Geiger. He worked with Wladimir Köppen on climatology, hence the Köppen–Geiger climate classification.
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