I think it was in the teens in Newark in 1982.
Hey Chris, can you go back to 1995, didn't we have an arctic shot in April that year with clear skies?
The high was around 37 and the low was around 23 (average mid January temps), and it was windy and sunny.
Maybe the temps would have stayed in the 20s that day if we had snow that day.
The other cold April day I remember was in 2016 when we had temps in the 30s with snow to our east near Cape Cod. Very windy that day too.
In 2003 we had three straight days in the 30s after the snowstorm.
I think we warmed up quickly in 1996 and 2018 after those snowstorms.