You've caught one of two errors - well, out of three if you include a very arguable one in October. Considering there were four editors on the project, I can't take all the blame, though!
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It was night in the lonesome October, of my most immemorial year.
I've been thoroughly enjoying the daily Poe calendar, but I just noticed a mistake in the entry for today (Feb 16th).
It says Maria Clemm died in 1871, therefore she "outlived Poe by nearly 32 years and her daughter by 34." Given that Poe died in 1849, she actually outlived Poe by 22 years and her daughter Virginia by 24 years.