Mount Iō

硫黄岳

Chino, Nagano · Elevation 2,760 m

Mount Iō (Iōdake) is a 2,760 m volcanic peak forming the northernmost summit of the southern Yatsugatake range, straddling Chino City and Minamimaki Village in Nagano. Within Yatsugatake-Chūshin Kōgen Quasi-National Park, it is famed for the dramatic horseshoe-shaped explosion crater on its north face, roughly 1 km across and 550 m deep. From the broad summit hikers enjoy commanding views of Yokodake, Akadake and Amidadake, and it is listed among Japan's 100 highest peaks (Hyaku-kōzan).

Mount Iō at a glance

Weather: The most settled day in the next 7 days is Sun, November 8: clear, gusts up to 8 m/s. Fri, Nov 6, Sat, Nov 7: strong wind (gusts up to 18 m/s).
Route: The shortest is Mount Iodake and Akaiwa-no-Atama Loop from Sakuradaira: about 6 h 25 min, 10.7 km, about 940 m of climbing.

Mount Iō weather (hourly, 14 days)

Sunrise today 06:10, sunset 16:50

		Tue, 11/3					Wed, 11/4										Thu, 11/5								Fri, 11/6								Sat, 11/7								Sun, 11/8								Mon, 11/9						Tue, 11/10				Wed, 11/11				Thu, 11/12				Fri, 11/13				Sat, 11/14				Sun, 11/15				Mon, 11/16				Tue, 11/17
Japan time		15	17	19	21	23	1	3	5	7	9	11	13	15	18	21	0	3	6	9	12	15	18	21	0	3	6	9	12	15	18	21	0	3	6	9	12	15	18	21	0	3	6	9	12	15	18	21	0	3	6	9	15	21	3	9	15	21	3	9	15	21	3	9	15	21	3	9	15	21	3	9	15	21	3	9	15	21	3	9	15	21	3	9	15

Temperature	°C	6°	1°	0°	-2°	-3°	-3°	-3°	-4°	-3°	3°	5°	6°	4°	0°	0°	0°	1°	0°	4°	8°	6°	3°	2°	1°	1°	1°	6°	9°	8°	2°	-1°	-4°	-6°	-7°	-2°	0°	-1°	-6°	-7°	-7°	-8°	-8°	0°	5°	5°	-1°	-2°	-3°	-3°	-3°	1°	4°	-2°	-3°	1°	3°	-3°	-5°	-4°	-2°	-8°	-9°	-1°	2°	-6°	-6°	-1°	1°	-8°	-8°	0°	4°	-5°	-6°	2°	4°	0°	0°	6°	7°	-3°	-7°	-1°	3°
Precipitation	mm														0.1	0.1	2.9	9	4.5	0.1	0.1	1.2					0.1																																0.1	0.2																		8	11		0.3	0.2
New snow	cm																																																										<.1	0.2
Snow depth	cm	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Wind	m/s	1	0	0	1	1	1	1	1	1	1	2	3	2	2	2	2	1	1	2	1	1	0	1	1	1	2	3	4	4	2	2	2	2	3	4	4	3	2	2	2	2	1	2	1	1	0	0	1	1	2	1	2	2	2	2	4	2	3	5	3	1	2	2	3	1	2	2	2	1	2	2	2	1	1	1	1	1	1	2	4	2	2	1	2
Wind gusts	m/s	8	5	4	5	5	5	5	5	4	6	8	9	9	9	10	11	11	9	7	7	9	8	6	8	9	10	12	15	16	14	12	11	12	14	17	18	17	14	10	9	9	9	8	7	8	6	6	7	7	8	8	13	8	6	8	14	13	16	22	21	14	7	8	12	10	10	11	12	10	8	7	8	6	7	7	10	9	12	11	16	15	9	6	7
Wind dir.		↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓	↓