Sumon (Niigata): temperature and climate normals

Latest14.0 °COct 9, 2026 20:10 JST

24 h max / min24.4 °C / 8.5 °C

Annual mean (normal)11.3 °Crank 588 of 903

Annual precipitation (normal)3,105.4mmrank 19

Altitude222 m

Last 24 hours

Mean maxMeanMean min

Month	Mean	Max	Min	≥30°C	Min<0°C	Precip.	Sun	Snow
Jan	-0.4 °C	2.6 °C	-3.0 °C	0.0days	28.3days	446.0mm	31.3h	209 cm
Feb	-0.2 °C	3.5 °C	-3.4 °C	0.0days	26.0days	295.0mm	49.4h	252 cm
Mar	2.3 °C	7.2 °C	-1.5 °C	0.0days	22.7days	222.4mm	83.2h	218 cm
Apr	7.7 °C	14.5 °C	2.4 °C	0.0days	5.7days	141.5mm	140.5h	137 cm
May	14.9 °C	21.9 °C	8.6 °C	0.7days	0.0days	125.5mm	182.3h	16 cm
Jun	19.4 °C	25.1 °C	14.5 °C	1.9days	0.0days	169.7mm	141.2h	0 cm
Jul	23.3 °C	28.4 °C	19.2 °C	11.1days	0.0days	311.0mm	134.1h	0 cm
Aug	24.4 °C	30.2 °C	20.1 °C	17.2days	0.0days	213.2mm	179.4h	0 cm
Sep	20.2 °C	25.8 °C	16.0 °C	5.1days	0.0days	181.8mm	134.8h	0 cm
Oct	13.9 °C	19.5 °C	9.6 °C	0.2days	0.0days	198.6mm	120.7h	0 cm
Nov	7.4 °C	12.7 °C	3.3 °C	0.0days	4.6days	318.2mm	88.3h	10 cm
Dec	2.0 °C	5.6 °C	-0.8 °C	0.0days	20.6days	470.9mm	44.7h	111 cm
Year	11.3 °C	16.4 °C	7.1 °C	37.1days	107.8days	3,105.4mm	1,336.4h	–

For reference: latest 14.0 °C; the Oct mean normal is 13.9 °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.