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Why is the ninth month called September?

sub-zero

[suhb-zeer-oh] /sʌbˈzɪər oʊ/
adjective
1.
indicating or recording lower than zero on some scale, especially on the Fahrenheit scale:
a week of sub-zero temperatures.
2.
characterized by or appropriate for sub-zero temperatures:
sub-zero climates; sub-zero clothing for the exploration.
Origin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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