Freezing rain requires surface temperatures below freezing and a warmer layer aloft that is above freezing. For the NEK, the Mount Washington Observatory has weather sensors at various elevations that allow the weather observer to identify a warm layer up to 6000 ft (approximately 800 mb).As of 6 PM Thursday, the temperature the base of Mount Washington (1600 ft) was 22.5 F and the summit (6288 ft) was 25.7 F, indicating a weak inversion. Precipitation would be falling as snow under these conditions. If th temperature at the summit were above 32 F, we could expect freezing rain or ice pellets.
Weather observations for Mount Washington can be found at this link.
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