Re: how cold?
It will be a little cool on Alaska and Baltic cruises; definitely need something to take the chill off. Cruises to Anrarctica or above the Arctic Circle you also need to be careful of; definitely need a jacket.
"Carpe diem quam minimum credula postero"
Seven Seas Explorer - Miami - Venice - Mar 2017
Silverseas Explorer - Arctic - Aug 2017
Seven Seas Voyager - Rome to Beijing - Oct 2017
Seven Seas Mariner - Lima to Buenos Aires - Jan 2018
Silverseas Explorer - Siberia - Jul 2018
Seven Seas Mariner - Australia Circumnavigation - Dec 2018