Temperatures were in the 40s, as they were here on Dec. 7, 1941.
Source
.. . . . . . . . . . . . . . . . . . . . . . . . . %%%. . . * . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ - - - - - - - - - - - - - - - - - - - - . . . . .