The NAO defined
en.wikipedia.org/wiki/North_Atlantic_oscillation
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The NAO defined
en.wikipedia.org/wiki/North_Atlantic_oscillation
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FEBRUARY 2015 NAO
Compiled by XMETMAN
https://xmetman.wordpress.com/2015/02/18/latest-north-atlantic-oscillation-data/
quote

” The cold August of 2014 shows up quite nicely with a very negative set of NAO values.”
Posted by Griteater on twitter
griteater @griteater · Jan 4 2019
The NAO Index for December 2018
was 0.61 (NOAA CPC)
The NAO has been..,

Negative in 2 of the last 15 months
Negative in 3 of the last 31 Dec-Mar winter months
Negative in 1 of the last 23 Dec-Feb winter months
Positive in every December since 2010
Positive in every January since 2011
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Here is the time series