Iiyama (Nagano): temperature and climate normals

Latest14.2 °COct 9, 2026 20:10 JST

24 h max / min24.9 °C / 9.2 °C

Annual mean (normal)11.3 °Crank 586 of 903

Annual precipitation (normal)1,412.0mmrank 569

Altitude313 m

Last 24 hours

Mean maxMeanMean min

Month	Mean	Max	Min	≥30°C	Min<0°C	Precip.	Sun	Snow
Jan	-1.6 °C	2.5 °C	-6.2 °C	0.0days	29.1days	171.8mm	72.7h	122 cm
Feb	-1.2 °C	3.6 °C	-6.3 °C	0.0days	26.4days	117.3mm	92.2h	139 cm
Mar	2.4 °C	8.0 °C	-2.7 °C	0.0days	23.5days	96.2mm	132.6h	106 cm
Apr	9.3 °C	16.1 °C	3.3 °C	0.0days	6.0days	63.1mm	177.0h	24 cm
May	15.7 °C	22.5 °C	9.4 °C	0.9days	0.1days	69.2mm	206.0h	0 cm
Jun	19.9 °C	25.6 °C	15.1 °C	3.0days	0.0days	101.4mm	161.2h	0 cm
Jul	23.7 °C	29.1 °C	19.7 °C	12.8days	0.0days	155.7mm	161.4h	0 cm
Aug	24.7 °C	30.6 °C	20.4 °C	18.8days	0.0days	128.8mm	203.1h	0 cm
Sep	20.4 °C	26.0 °C	16.1 °C	5.6days	0.0days	127.2mm	140.1h	0 cm
Oct	13.8 °C	19.7 °C	9.1 °C	0.3days	0.1days	117.2mm	132.7h	0 cm
Nov	7.2 °C	13.0 °C	2.6 °C	0.0days	7.1days	96.8mm	104.4h	2 cm
Dec	1.4 °C	5.9 °C	-2.5 °C	0.0days	23.8days	167.4mm	83.7h	62 cm
Year	11.3 °C	16.9 °C	6.5 °C	41.2days	115.8days	1,412.0mm	1,668.7h	144 cm

For reference: latest 14.2 °C; the Oct mean normal is 13.8 °C (one observation vs a monthly mean).

Normals: JMA 2020 normals (1991–2020 averages). Latest values are observations fetched once a day, not real time.