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Thanks to @FrankfurtZack , I became aware of the US monthly mortality data available via NBER. It only starts in 1959, so we miss the '57/'58 pandemic. But '68 - '70 pandemic can be analyzed. It is interesting that '68 pandemic also showed pattern of large early year peak and... https://twitter.com/InProportion2/status/1304549026679980037
...smaller July/August peak. I've only looked at two states so far, but the FL '69 summer peak was much larger relative to it's winter peak than NY's summer peak was to it's winter peak. A couple of other interesting things: the '68 pandemic officially started in Sept. '68, but.
...there clearly was a prior winter excess death peak that year. Also this article https://pubmed.ncbi.nlm.nih.gov/15962218/ "In North America, the majority of influenza-related deaths in 1968/1969 and 1969/1970 occurred during the first pandemic season (United States, 70%; Canada, 54%)...
...Conversely, in Europe and Asia, the pattern was reversed: 70% of deaths occurred during the second pandemic season. The second pandemic season coincided with a drift in the neuraminidase antigen." My excess death charts are based on standard time-series decomposition of trend
...and seasonality.
