Maybe this has been discussed before, but does anyone know what is considered Mt. Washington's coldest recorded temperature? I don't necessarily mean what does MWO consider their coldest reading to have been.
I ask because I noticed a while back that -50F had been recorded on Mt. Washington by the Signal Service on Jan 22, 1885. It was noted in their monthly report and also mentioned in the 'Monthly Weather Review,' which is a major source of weather data for the 1800s. I just noticed that Mt. Washington's page on wikipedia has been changed to include the following paragraph, which doesn't cite its source:
"For many years, the record low temperature was thought to be −47 °F (−44 °C) occurring on January 29, 1934, but upon the first in-depth examination of the data from the 1800s at NOAA's National Climatic Data Center in Asheville, North Carolina, a new record low was discovered. Mount Washington's official record low of −50 °F (−46 °C) was recorded on January 22, 1885. However, there is also hand-written evidence to suggest that an unofficial low of −59 °F (−51 °C) occurred on January 5, 1871."
I'm not sure about that -59F on 1/5/1871, as I can't find any records of it; but it does seem that the -50F on 1/22/1885 would be legitimate.
As I hinted above, MWO may not consider that to be their coldest reading on the mountain--but does the NOAA or National Climatic Data Center consider it to be so?