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From the city of Portland, Oregon, the following information was obtained: The epidemic first appeared October 11, with a second one toward the end of the year. There were 8,079 cases reported, with 658 deaths from influenza and 250 from pneumonia. Weather conditions were stated to be varied, but the health officer believed that during the worst wave the weather was clear and dry, with easterly wind. He believed that a decrease in influenza was noticed immediately after a Chinook wind and warm rain. Similar observations were made by Coutant in Manila.

A weather comparison of 12 large cities, well distributed over the United States, studied during this pandemic of influenza and checked with normal weather during that of many years, shows: Boston, fair with no abnormality; New York, clear and delightful, no abnormality; Philadelphia, mild and fair; Pittsburgh, mild and cloudy; Cleveland, pleasant fall weather; Chicago, normal and dry; Louisville, delightful fall weather; St. Louis, fair and warm-damp, rainy weather later seemed to control the epidemic; New Orleans, mild; Minneapolis, a rainy fall and no cold weather, which is unusual there; San Francisco, generally fair, and Portland, Oregon, clear and dry.