The coldest February in the eastern US occurred in 1934, which was also the hottest year on record in the US.
ftp://ftp.library.noaa.gov/docs.lib/htdocs/rescue/mwr/062/mwr-062-02-c1.pdf
ftp://ftp.library.noaa.gov/docs.lib/htdocs/rescue/mwr/062/mwr-062-07-c1.pdf
For the entire US, the coldest February occurred in 1936, which was followed by the hottest summer in the US.
ftp://ftp.library.noaa.gov/docs.lib/htdocs/rescue/mwr/064/mwr-064-02-c1.pdf
March 1936 brought terrible flooding to the Eastern US.
ftp://ftp.library.noaa.gov/docs.lib/htdocs/rescue/mwr/062/mwr-062-03-c1.pdf
21 Mar 1936, Page 5 – The Evening Times at Newspapers.com
This week in 1936, much of the Eastern US was underwater. My grandfather was evacuated from a meeting in downtown Pittsburgh by boat.
20 Mar 1936 – ALL EASTERN AMERICA UNDER FLOOD WATERS
19 Mar 1936, Page 1 – The Plain Speaker at Newspapers.com
TimesMachine: Friday March 20, 1936 – NYTimes.com
ftp://ftp.library.noaa.gov/docs.lib/htdocs/rescue/mwr/064/mwr-064-07-c1.pdf