Mean number of thunderstorm days in the United States
1952
The data presented in the accompanying charts and tables were taken directly from the 1951 Local Climatological Summary issued for 266 Weather Bureau Offices in the continental United States, 16 in Alaska, 5 in certain island of the Pacific and 2 in the West Indies. The charts cover only the continental United States but data for all these locations are shown in the table. The computed mean values shown are based on the official records at each location.
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