The 'January thaw' hit New England. Even Mount Washington, which recorded the all-time warmest temperature ever for the month. The temperature at the Mount Washington observatory hit 48 degrees at 6:00 a.m. Sunday (Jan. 13, 2013), making New England's tallest mountain warmer than Phoenix and San Diego. The previous record warmth for the month atop Mount Washington was 47 set on Jan. 20, 1995.

The Mount Washington Observatory is a private, non-profit scientific and educational institution organized under the laws of the state of New Hampshire. The goal is to understand more about the natural systems that create the Earth's weather and climate. The first regular meteorological observations on Mount Washington were taken from 1870 to 1892. The Mount Washington station was the first of its kind in the world, setting an example followed in many other countries.