TABLE 2.
Number of ascents under the most severe environmental conditions of barometric pressure, ambient temperature, wind chill temperature and facial frostbite time within the 10th percentile and wind speed within 90th percentile for ascents without supplemental oxygen.
| Ascents group and number | BP ≤ 333 hPa | Temp ≤ −30°C | Wind ≥ 25 m⋅s–1 | WCT ≤ −54°C | FFT ≤ 3 min |
| ME-noO2 (210) | 49 (23%) | 12 (6%) | 5 (2%) | 3 (1%) | 3 (1%) |
| K2-noO2 (213) | 0 | 2 (1%) | 4 (2%) | 2 (1%) | 2 (1%) |
| wME-noO2 (1) | 1 (100%) | 1 (100%) | 1 (100%) | 1 (100%) | 1 (100%) |
| wK2-noO2 (1) | 0 | 1 (100%) | 0 | 1 (100%) | 0 |
| wH&H-noO2 (10) | 0 | 6 (60%) | 9 (90%) | 8 (80%) | 10 (100%) |
| wL&H-noO2 (50) | 0 | 14 (28%) | 31 (62%) | 25 (50%) | 33 (66%) |
| wL&K-noO2 (14) | 0 | 14 (100%) | 0 | 10 (71%) | 1 (7%) |
| w8000-yesO2 (29) | 14 (48%) | 28 (97%) | 17 (59%) | 28 (97%) | 19 (66%) |
| wME-yesO2 (14) | 14 (100%) | 14 (100%) | 12 (86%) | 14 (100%) | 14 (100%) |
| wK2-yesO2 (9) | 0 | 9 (100%) | 0 | 9 (100%) | 0 |
ME-noO2, Everest non-oxygen non-winter ascents; K2-noO2, K2 non-oxygen non-winter ascents; wME-noO2, Everest non-oxygen winter ascents; wK2-noO2, K2 non-oxygen winter ascents; wH&H-noO2, high Himalayan 8K peaks non-oxygen winter ascents; wL&H-noO2, low Himalayan 8K peaks non-oxygen winter ascents; wL&K-noO2, low Karakoram 8K peaks non-oxygen winter ascents; w8000-yesO2, 8K peaks oxygen-supported winter ascents; wME-yesO2, Everest winter oxygen-supported ascents; wK2-yesO2, K2 winter oxygen-supported ascents.
BP, barometric pressure; Temp, temperature; Wind, wind speed; WCT, wind chill equivalent temperature; FFT, facial frostbite time.