Hannō Alps · Saitama · JapanSummit weather, forecast and climate

Mount Tōnosu

271 m

Elevation271 mabove sea level

Prominence–independent height

Isolation2.9 kmto a higher summit

Summit, Jul27°average high

35.87° N, 139.30° EElevation 271 mUTC+9 · Japan Standard Time

From the valley to the top

Freezing level in October: above the summit

iThe mountain

Mount Tōnosu in brief

Mount Tōnosu rises to 271 m in the Hannō Alps, Saitama, Japan.

At the summit, August is the mildest month with average highs of 29°, while nights fall below freezing in 2 months of the year.

The nearest town in the atlas is Hannō, 2.6 km to the SE at 113 m.

iiForecast

Temperatures are adjusted to each height; summits are usually colder and windier than the valley forecast suggests.

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iiiSummit climate

Climate normals for the summit area (~1 km grid), station-adjusted

Climate normals for Mount Tōnosu by month
Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Average high	7°	8°	11°	17°	21°	24°	27°	29°	25°	19°	14°	10°
Average low	-3°	-2°	2°	7°	13°	17°	21°	22°	19°	12°	6°	1°
Precipitation	41 mm	43 mm	84 mm	102 mm	124 mm	156 mm	168 mm	209 mm	218 mm	171 mm	69 mm	40 mm
Cloud cover	25%	32%	42%	46%	53%	64%	57%	45%	51%	44%	35%	24%
Daylight	9h 59	10h 53	11h 55	13h 04	14h 03	14h 34	14h 22	13h 33	12h 27	11h 20	10h 18	9h 45
Month score	47	45	35	59	57	53	47	45	58	61	60	47

Average height of the 0 °C level from the summit normals (6.5 °C per km); snow months have a summit mean at or below +1 °C

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Freezing level	600 m	700 m	1,250 m	2,150 m	2,850 m	3,400 m	3,950 m	4,200 m	3,600 m	2,700 m	1,850 m	1,050 m
Summit	above 0 °C	above 0 °C	above 0 °C	above 0 °C	above 0 °C	above 0 °C	above 0 °C	above 0 °C	above 0 °C	above 0 °C	above 0 °C	above 0 °C

ivTerrain

vNeighbours

Mountain	Elevation	Prominence	Distance	July summit high
Mount Ohira, Saitama	1,603 m	–	23 km W	21°
Mount Mutsuishi	1,479 m	–	23 km W	22°
Mount Gozen	1,405 m	–	22 km SW	22°
Mount Kawanori	1,363 m	–	17 km W	22°
Mount Bukō	1,304 m	–	20 km NW	23°
Mount Ōmochi	1,294 m	–	19 km W	23°
Mount Odake (Tokyo)	1,267 m	–	19 km SW	23°
Mt. Takegawa	1,052 m	–	17 km NW	24°