Mount Nasu
# Mount Nasu

Mount Nasu (那須岳, Nasu-dake) is a group of complex volcanoes located in the northeast part of Nikkō National Park, Japan. The tallest peak is Sanbonyari Peak at a height of 1,916.9 m (6,289 ft). Mount Nasu is one of the 100 Famous Japanese Mountains.

## Major peaks

Mount Nasu has the following major peaks:

* Sanbonyari Peak – 1916.9 m
* Chausu Peak – 1915 m
* Asahi Peak – 1896 m
* Minamigatsusan – 1776 m
* Kuro-oya Peak – 1589 m

These peaks are known collectively as Nasu Five Peaks (那須5岳, Nasu-Go-Take).

## Climate

Climate data for Mount Nasu (1991−2020 normals, extremes 1976−present) :

| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Record high °C (°F) | 12.7 (54.9) | 16.8 (62.2) | 21.1 (70.0) | 26.8 (80.2) | 29.6 (85.3) | 30.3 (86.5) | 31.8 (89.2) | 32.2 (90.0) | 29.5 (85.1) | 24.6 (76.3) | 20.0 (68.0) | 17.4 (63.3) | 32.2 (90.0) |
| Average high °C (°F) | 1.9 (35.4) | 2.7 (36.9) | 6.8 (44.2) | 13.0 (55.4) | 18.2 (64.8) | 20.7 (69.3) | 24.3 (75.7) | 25.4 (77.7) | 21.4 (70.5) | 16.1 (61.0) | 10.9 (51.6) | 5.1 (41.2) | 13.9 (57.0) |
| Daily mean °C (°F) | −1.7 (28.9) | −1.3 (29.7) | 2.0 (35.6) | 7.8 (46.0) | 13.0 (55.4) | 16.4 (61.5) | 20.2 (68.4) | 21.0 (69.8) | 17.3 (63.1) | 11.8 (53.2) | 6.4 (43.5) | 1.1 (34.0) | 9.5 (49.1) |
| Average low °C (°F) | −5.3 (22.5) | −5.3 (22.5) | −2.4 (27.7) | 2.6 (36.7) | 7.7 (45.9) | 12.3 (54.1) | 16.7 (62.1) | 17.5 (63.5) | 13.8 (56.8) | 7.7 (45.9) | 2.0 (35.6) | −2.6 (27.3) | 5.4 (41.7) |
| Record low °C (°F) | −11.7 (10.9) | −12.1 (10.2) | −10.4 (13.3) | −6.0 (21.2) | −2.3 (27.9) | 3.6 (38.5) | 8.7 (47.7) | 8.9 (48.0) | 3.2 (37.8) | −1.2 (29.8) | −6.1 (21.0) | −10.2 (13.6) | −12.1 (10.2) |
| Average precipitation mm (inches) | 52.6 (2.07) | 42.8 (1.69) | 101.6 (4.00) | 139.6 (5.50) | 180.8 (7.12) | 220.5 (8.68) | 305.7 (12.04) | 303.9 (11.96) | 305.3 (12.02) | 212.6 (8.37) | 89.2 (3.51) | 60.1 (2.37) | 2,014.7 (79.33) |
| Average snowfall cm (inches) | 103 (41) | 79 (31) | 45 (18) | 7 (2.8) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 4 (1.6) | 55 (22) | 293 (116.4) |
| Average precipitation days (≥ 1.0 mm) | 9.1 | 8.3 | 10.4 | 11.3 | 12.1 | 15.9 | 18.3 | 17.0 | 14.8 | 11.5 | 8.3 | 9.1 | 146.1 |
| Average snowy days (≥ 1 cm) | 11.5 | 8.8 | 5.5 | 0.6 | 0 | 0 | 0 | 0 | 0 | 0 | 0.4 | 5.9 | 32.7 |
| Mean monthly sunshine hours | 131.0 | 129.0 | 156.4 | 170.4 | 169.1 | 108.8 | 98.7 | 115.3 | 98.9 | 115.1 | 130.1 | 132.6 | 1,555.2 |
| Source 1: JMA ||||||||||||||
| Source 2: JMA ||||||||||||||

## Eruption

It is estimated that Mount Nasu started erupting 600 thousand years ago. The eruption started from the north end of the mountain range, at Kashi-Asahi Peak. Only Chausu Peak is active today.

## Access

* Nasu Sancho Station of Nasu Ropeway
* Sandogoya Onsen Bus Stop of Kanto Transportation

## Gallery

* Chausu lava dome and Asahi Peak
* Chausu lava dome and fumes
* Asahi Peak
* West view from Sanbonyari Peak
* Sanbonyari Peak and snow in summer
* At the Sanbonyari Peak
* Topographic map
* To Asahi Peak
