Now that January has ended we get our first look at the 1991-2020 averages.
NYC, LGA, JFK, and EWR now have an average high of 40°F in January, up from 39°F in the 1981-2010 averages. EWR is leading the pack at 40.3°F. ISP falls short by 0.1°F.
Islip is now “subtropical”, meaning that the mean temperature in its coldest month (January) is at the freezing point 32°F, up from 31°F in the 1981-2010 averages.