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Post by Lommaren on Feb 7, 2020 12:05:41 GMT -5
It feels quite hard to guess. I've heard -20°C is really common when people mostly try and climb it (summer), but I assume daytime highs can get a bit above that during "heat waves". It's a bit of an unknown to me and needless to say, a weather station up there ain't going to happen. That being said, I'm not sure how much temps in the open air at 9,000 metres above sea level really can predict the temps and diurnals of a mountain.
Is there anyone who'd be prepared to guess mainly what the:
July high/low January high/low
would be up there?
Free air temps appear to be around -24°C in July and -45°C this week from some quick Ventusky research. However, given that it's a mountain top it might be a bit different to satellite measurements. However, it does appear to be the "maritime Vostok Station" by the looks of things.
Wild guess:
July: -20/-25 January: -38/-45
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Post by shalop on Feb 7, 2020 12:26:03 GMT -5
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Post by nei on Feb 7, 2020 12:27:54 GMT -5
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Post by nei on Feb 7, 2020 12:56:00 GMT -5
here's the automated weather stations on Everest, recent weather (just last 6 hours) www.nationalgeographic.org/earthpulse/everest/widget/16/no station on the actual summit, there's one listed at 8400 m that either was never installed, not functioning at the moment, or just not sending data to the website. a station at 7945 m is on the webpage; currently -35°C |
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Post by Lommaren on Feb 7, 2020 12:59:35 GMT -5
here's the automated weather stations on Everest, recent weather (just last 6 hours) www.nationalgeographic.org/earthpulse/everest/widget/16/no station on the actual summit, there's one listed at 8400 m that either was never installed, not functioning at the moment, or just not sending data to the website. a station at 7945 m is on the webpage; currently -35°C Whether the 7,945 metre station can get above freezing in summer would be interesting. If 1°C per 100 metres would be assumed, that could roughly be the demarkation line of the highest ever place to record such a tmeperature. My hunch is that it's a bit lower than that for a ratio and thus the world's endless freeze line for elevation is a bit lower than that. |
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Post by shalop on Feb 7, 2020 13:36:21 GMT -5
no station on the actual summit, there's one listed at 8400 m that either was never installed, not functioning at the moment, or just not sending data to the website. Makes sense; on the summit you get 200mph winds and quick rime formation so any sensor would become useless in no time. My guess is that there are similar problems right now with the highest sensor: it's wintertime and there's no one going up there to do maintenance. Could be wrong though. |
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Post by Ariete on Feb 7, 2020 14:22:38 GMT -5
If at the summit of Everest the pressure is 0.333 atm, and halfway up to the troposphere, IDK what weather patterns could cause such a big warming that temperatures would go above freezing. 10 hpa temps around everest seem to be around -50C right now.
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Post by knot on Feb 7, 2020 21:39:55 GMT -5
I'd be more keen in seeing averages for Mt. McKinley instead, as it will prove much colder than Everest due to latitude. McKinley's almost 2,000 m lower than Everest, but also tremendously higher in latitude; 63° N vs. 28° N—the latitudinal disparity is ten-fold greater than the altitudinal disparity.
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Post by omegaraptor on Feb 7, 2020 21:55:13 GMT -5
I'd be more keen in seeing averages for Mt. McKinley instead, as it will prove much colder than Everest due to latitude. McKinley's almost 2,000 m lower than Everest, but also tremendously higher in latitude; 63° N vs. 28° N—the latitudinal disparity is ten-fold greater than the altitudinal disparity. I remember reading once that unofficial thermometers on Mt Denali have recorded temps in the -100ºF range. Could very well beat out Oymyakon and Verkhoyansk for Northern Pole of Cold. |
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Post by shalop on Feb 7, 2020 22:04:09 GMT -5
Denali has a weather station planted at 5.8km AMSL. It has recorded temps down to -60C, but is not officially maintained. Also I am not sure where to find the data for the station, but you can read about it here. en.wikipedia.org/wiki/Denali#Weather_station |
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Post by Crunch41 on Feb 8, 2020 1:52:07 GMT -5
Denali has a weather station planted at 5.8km AMSL. It has recorded temps down to -60C, but is not officially maintained. Also I am not sure where to find the data for the station, but you can read about it here. en.wikipedia.org/wiki/Denali#Weather_stationMe neither. It may have stopped recording. Without asking the people working on it it's not likely that the data is available anywhere.
January -33/-43F July -3/-13F, record high 30F/-1C, record low -23F/-31C That actually sounds a bit too warm in my opinion, not that much colder than the coldest spots in the winter. However, those spots are extremely cold mostly due to large temperature inversions.
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Post by Nidaros on Feb 8, 2020 5:24:16 GMT -5
Insanely low air pressure on Everest is a factor, as mentioned by others. Speaking about mountains at high latitude: The summit of Newtontoppen (1,713 m) in northeastern part of Spitsbergen island in the high Arctic is at 79 degres N latitude and should be cold as well even if the altitude is modest compared to the others.
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Post by knot on Feb 8, 2020 5:36:09 GMT -5
Insanely low air pressure on Everest is a factor, as mentioned by others. Speaking about mountains at high latitude: The summit of Newtontoppen (1,713 m) in northeastern part of Spitsbergen island in the high Arctic is at 79 degres N latitude and should be cold as well even if the altitude is modest compared to the others.
Vinson Massif (Antarctica) tops them all; 4,892 m AMSL, at 78° 38′ 02.76″ S. |
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Post by Lommaren on Feb 8, 2020 5:59:37 GMT -5
Isn't it so that the higher the latitude, the greater the temperature inversion though? Which could explain why Denali is significantly less cold than the Siberian valleys during winter. For the same reason the mountains above Oymyakon should be quite a bit less severe.
For the same reason, I doubt the Svalbard one is that much colder than sea level in winter, but instead below freezing in summer.
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Post by nei on Feb 8, 2020 9:12:57 GMT -5
here's mountain-forecast.com forecast of Everest temperatures and freezing level. I think this mostly is just model output (GFS?) but should should be roughly accurate for the first few days of the forecast www.mountain-forecast.com/peaks/Mount-Everest/forecasts/8850current elevation of the freezing level is around 2000 m, rising to 4750 m midweek. It's winter now, not sure what summer would look like =============== found an blog post on Mt. Everest weather from wunderground. Written before the automated stations near the summit were installed www.wunderground.com/blog/weatherhistorian/extreme-weather-the-weather-of-the-summit-of-mt-everest.htmlThe highest meteorological observatory in the area is situated on the South Col at an altitude of 16,568’/5,050m but climbers often carry thermometers on expeditions and we have a general idea of the temperature trends. At no time does the temperature ever rise above freezing. 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. The coldest months are December-February, with January night temperatures averaging -33°F (-36°C) and the daytime just a couple of degrees warmer if at all. The coldest temperature actually measured on the summit was in February 2003 with a -41.8°F (-41°C) reading. There have been some published reports speculating that the absolute minimum temperature may fall as low as -76°F (-60°C). This seems reasonable when Siberian air spills over the Tibetan Plateau and Himalayan Range. During the peak climbing months of May and October the summit temperature averages -13° to -17°F (-25° to -27°C).sounds like Denali is colder, as many of us guessed |
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Post by shalop on Feb 9, 2020 15:12:15 GMT -5
While on the subject of mountain weather, some legendary guy from Minnesota once solo climbed Denali in the coldest part of winter. With a 13000 foot ascent from base, it is not an easy climb even in midsummer; arguably the hardest of the seven summits. In winter you've got wind speeds up to 150mph with temps consistently below -40. On the same level of crazy: freestyling the Himalayan Karakoram on alpine skis. However, these guys did it in April when it usually is -10c during the day and -20 to -30 at night.
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