First map of global temperatures based on Humboldt’s concept of isotherms, ca. 1823. Based on data from 58 weather stations.

First map of global temperatures based on Humboldt’s concept of isotherms, ca. 1823. Based on data from 58 weather stations. By 1864 there were 2000 stations.
Coen, Deborah R.. Climate in Motion (p. 135). University of Chicago Press. Kindle Edition. https://t.co/OR8r6xEuVR

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