World distribution of thunderstorm days.
Répartition mondiale des jours d'orage.

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Item Link Original Source
Limited (search only)   pt.1 University of Illinois at Urbana-Champaign
Limited (search only)   pt.1sup.1 University of Illinois at Urbana-Champaign
Limited (search only)   pt.2 University of Illinois at Urbana-Champaign