If you were also curious, the lowest actual recorded temperature without windchill was -128 (https://wmo.asu.edu/content/world-lowest-temperature), so this temperature is about 80 degrees higher than that.
For anyone reading, that isn't a Mt. Washington temperature - just world lowest record.
According to wikipedia Mt. Washington's record low for Jan/Feb is -47/-46F, respectively. So tonight's -46F is on par for the Feb record low @ Mt. Washington.
The -108 windchill was an all time US record.[0][1]
[0] https://www.nytimes.com/2023/02/04/nyregion/mount-washington...
https://web.archive.org/web/20230204183149/https://www.nytim...
[1] https://www.mountwashington.org/experience-the-weather/mount...