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I'm having trouble finding this statistic. It seems very likely that this would have occurred in interior northern Greenland, and I've even seen Wikipedia mention a figure of -30 C (!), but I can find no references to back that up.
I think records from places like Mt. Everest, Mt. McKinley and other high peaks should be left out.
Summit Camp, Greenland looks like a strong contender. It's at least below -15C, looking at the average low for July. My guess is it's somewhere around -20C to -25C
Mt. Everest summit probably averages colder than Greenland Summit Camp. Mt. Everest may be less variable, so the record low could still be on Greenland.
The warmest months, July and August, seem to average around -2°F-0°F (-16°C to -18°C) during the night and perhaps a few degrees above this during the day. I would speculate that the warmest temperature to ever be reached on the summit to be in the 10-15°F (range -10°C to -12°C) on still and sunny days.
Looking at the weather data for Summit Camp on Weather Underground, the coldest temp there in July is -16F in 2009 2010 and 2012, but there's only data back to 2004, not sure how reliable.
There is weather data for Mount McKinley here, excel files for the entire year. I found a min of -29.4C for july 2004, the only year I searched.
I wonder what would have the lowest for a low-level elevation?
As a side note, lowest July temperature for the US seems to be 10F at Painter, WY at about 6800 feet.
No it isn't, topography is probably a factor. I can't find where Painter is, it doesn't show up on Google maps. There is a place called Painter Outpost up in the mountains. Apparently Lolabana Ranch has also hit 10F in july 1911 but I can find no other mention of the place.
The mountains in the western US can get hard freezes any time of year, some locations have average lows barely above freezing in summer with record lows in the teens. Here's a few examples:
Bodie, California: July average 77/35F (25/2C), record low 12F/-11.1C. Located at 8400 ft/2550m on an exposed plain that can get extremely high winds, no longer inhabited. It is the place in the US with the most frosts per year, more than Alaska, apparently averaging 308 a year.
Stanley, Idaho: July average low 79/36F (26/2C), record low 15F/-9.4C. Located in a valley at 6300ft/1900m in the mountains.
Darwin Ranch, Wyoming: July average low 72/35F/ (22/2C), record low 15F/-9.4C. A small ranch open to tourists, isolated in the mountains at 8200ft/2500m.
Higher elevations:
Climax, Colorado, a mine at 11400 ft/3460m has a record low of 12F/-11.1C in July but only 18F/-7.8C in August. July averages 65/39F (18/4C).
Leadville, Colorado, a town at 10100 ft/3100m has a July average of 71/40F (22/5C) but the record low is just 29F/-2C, much milder than the other places.
Excluding higher elevations and ice caps, the lowest temperature ever recorded in the northern hemisphere in July is -12,2° reached in Breckenridge (Colorado, USA) and Lolabana Ranch (Wyoming, USA). I'm not sure about the dates, though; the second should be around 1911 or 1912.
At higher elevations it is -30,5° on Mount McKinley, but again I don't know the date.
Excluding higher elevations and ice caps, the lowest temperature ever recorded in the northern hemisphere in July is -12,2° reached in Breckenridge (Colorado, USA) and Lolabana Ranch (Wyoming, USA). I'm not sure about the dates, though; the second should be around 1911 or 1912.
At higher elevations it is -30,5° on Mount McKinley, but again I don't know the date.
I would think it is considerably colder than that. I do not consider 10,000 feet as low elevation either.
Ireland has recorded -3c in august.
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