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Monthly climate in Itoigawa, Niigata, Japan

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Itoigawa features a humid subtropical climate (Cfa).Temperatures typically range between 2 °C (35 °F) and 26 °C (78 °F) through the year, but rarely can drop to -6 °C (22 °F) or can rise to as high as 34 °C (94 °F).The average annual precipitation amounts to about 2768 mm (109.0 inches) and receives 231 rainy days on the 1 mm (0.04 inches) threshold annually.Itoigawa enjoys an average of 2967 hours of sunshine throughout the year, and daylight varies from 9 hours 39 minutes to 14 hours 38 minutes per day.

Monthly average temperatures in Itoigawa, Niigata, Japan §

The warmest months in Itoigawa are July, August and September, with daily mean temperatures ranging from 22 to 26 °C (72 - 78 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 2 to 4 °C (35 - 40 °F) throughout the day. On average each year, Itoigawa experiences 45 days above 25 °C (77.0 °F) and 44 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Itoigawa, Niigata, Japan.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 11°C
(53°F)		 12°C
(54°F)		 16°C
(61°F)		 21°C
(70°F)		 26°C
(79°F)		 26°C
(80°F)		 34°C
(94°F)		 33°C
(91°F)		 32°C
(90°F)		 28°C
(82°F)		 22°C
(71°F)		 18°C
(65°F)
Mean maximum 8°C
(47°F)		 9°C
(49°F)		 14°C
(58°F)		 19°C
(66°F)		 23°C
(74°F)		 24°C
(75°F)		 30°C
(86°F)		 32°C
(90°F)		 29°C
(84°F)		 25°C
(76°F)		 19°C
(67°F)		 13°C
(56°F)
Average high 3°C
(38°F)		 3°C
(39°F)		 7°C
(46°F)		 12°C
(54°F)		 18°C
(64°F)		 21°C
(70°F)		 26°C
(78°F)		 28°C
(82°F)		 24°C
(75°F)		 18°C
(65°F)		 13°C
(55°F)		 6°C
(44°F)
Daily mean 2°C
(35°F)		 2°C
(35°F)		 5°C
(41°F)		 9°C
(49°F)		 15°C
(59°F)		 19°C
(66°F)		 24°C
(75°F)		 26°C
(78°F)		 22°C
(72°F)		 16°C
(62°F)		 11°C
(51°F)		 4°C
(40°F)
Average low -0°C
(32°F)		 -0°C
(32°F)		 3°C
(37°F)		 7°C
(45°F)		 13°C
(55°F)		 17°C
(63°F)		 22°C
(72°F)		 24°C
(75°F)		 20°C
(68°F)		 15°C
(58°F)		 8°C
(47°F)		 3°C
(37°F)
Mean minimum -3°C
(26°F)		 -4°C
(26°F)		 -2°C
(29°F)		 1°C
(34°F)		 7°C
(45°F)		 13°C
(56°F)		 19°C
(67°F)		 20°C
(69°F)		 15°C
(60°F)		 9°C
(49°F)		 2°C
(37°F)		 -2°C
(28°F)
Minimum -5°C
(23°F)		 -6°C
(22°F)		 -4°C
(24°F)		 -1°C
(31°F)		 6°C
(42°F)		 10°C
(51°F)		 18°C
(64°F)		 18°C
(64°F)		 13°C
(56°F)		 8°C
(47°F)		 -0°C
(32°F)		 -4°C
(26°F)

Compare climate in Itoigawa with other places

Compare temperature, precipitation, sunshine, UV index in Itoigawa, Niigata, Japan with other places around the world.

Monthly average precipitation in Itoigawa, Niigata, Japan §

Itoigawa usually has the most precipitation in July, August and December, with an average of 22 rainy days and 302 mm (11.9 inches) of precipitation per month.The driest months in Itoigawa are April, May and June. On average, 160 mm (6.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Itoigawa, Niigata, Japan.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 263 (10.4) 235 (9.2) 175 (6.9) 174 (6.9) 138 (5.4) 168 (6.6) 347 (13.7) 265 (10.4) 265 (10.4) 258 (10.2) 185 (7.3) 294 (11.6)
Average precipitation days (≥ 1 mm) 23 22 18 15 15 13 23 20 21 18 19 24

Monthly sunshine hours in Itoigawa, Niigata, Japan §

The sunniest months in Itoigawa are May, June and August, when the sun shines an average of 9 hours 48 minutes a day.Least sunny months in Itoigawa: January, February and December receive an average of 5 hours 59 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Itoigawa, Niigata, Japan.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 148 204 258 280 303 296 286 302 252 227 215 192
Mean daily daylight hours 9h 55m 10h 48m 11h 57m 13h 8m 14h 8m 14h 38m 14h 23m 13h 31m 12h 23m 11h 12m 10h 10m 9h 39m

Solar UV radiation in Itoigawa, Niigata, Japan §

Itoigawa experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure.January, February and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Itoigawa UV Index data.

Average daily maximum UV levels by month for Itoigawa, Niigata, Japan.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 3 5 7 9 10 10 11 11 9 6 5 3