In short, climate change has reduced the intensity / frequency of cold
extremes averaged over time.
Not exact matches
You are correct that regional and
average weather changes
over various
time scales of interest, and that
extreme events continue to occur.
Weather is the daily temperature, it can fluctuate to each
extreme rapidly whereas climate is an
average of temperatures
over a long period of
time.
(Remember, it is not the
extremes or the raw temperatures you are measuring; but, the change in the
average over time.