Not really that bold. Look at the week after St. Patrick’s Day. Still a very positive NAO. If there was a -NAO block showing up like last year, and the last few March’s, then you have an argument. Once you get to 3/15, climatology alone at our latitude says it’s over minus a freak event and even then, how many major snowstorms have hit the NYC metro area after that date, in history? It gets even worse by 3/20, Equinox. You have a late August/early September sun angle overhead at that point, long days. And late March “cold” is totally different than winter (Dec, Jan, Feb) cold. Our average temps are skyrocketing at that point. “Cold” compared to average isn’t all that cold