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Monthly climate in Seiro, Niigata, Japan

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Seiro features a humid subtropical climate (Cfa).Temperatures typically range between 2 °C (37 °F) and 27 °C (80 °F) through the year, but rarely can drop to -6 °C (21 °F) or can rise to as high as 37 °C (99 °F).The average annual precipitation amounts to about 2351 mm (92.6 inches) and receives 227 rainy days on the 1 mm (0.04 inches) threshold annually.Seiro enjoys an average of 2901 hours of sunshine throughout the year, and daylight varies from 9 hours 34 minutes to 14 hours 44 minutes per day.

Monthly average temperatures in Seiro, Niigata, Japan §

The warmest months in Seiro are July, August and September, with daily mean temperatures ranging from 22 to 27 °C (73 - 80 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 2 to 5 °C (37 - 41 °F) throughout the day. On average each year, Seiro experiences 76 days above 25 °C (77.0 °F) and 32 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Seiro, 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)		 15°C
(59°F)		 19°C
(67°F)		 24°C
(76°F)		 29°C
(85°F)		 31°C
(88°F)		 37°C
(99°F)		 37°C
(98°F)		 36°C
(96°F)		 30°C
(86°F)		 23°C
(74°F)		 19°C
(66°F)
Mean maximum 9°C
(48°F)		 11°C
(52°F)		 17°C
(63°F)		 22°C
(71°F)		 27°C
(81°F)		 27°C
(82°F)		 33°C
(91°F)		 36°C
(96°F)		 31°C
(89°F)		 27°C
(81°F)		 21°C
(70°F)		 14°C
(58°F)
Average high 4°C
(40°F)		 5°C
(42°F)		 10°C
(51°F)		 15°C
(59°F)		 21°C
(70°F)		 24°C
(75°F)		 28°C
(83°F)		 30°C
(86°F)		 26°C
(79°F)		 20°C
(68°F)		 14°C
(57°F)		 7°C
(46°F)
Daily mean 2°C
(37°F)		 3°C
(37°F)		 7°C
(44°F)		 11°C
(52°F)		 17°C
(63°F)		 21°C
(69°F)		 25°C
(78°F)		 27°C
(80°F)		 22°C
(73°F)		 17°C
(62°F)		 11°C
(52°F)		 5°C
(41°F)
Average low 0°C
(33°F)		 1°C
(33°F)		 3°C
(38°F)		 7°C
(45°F)		 13°C
(56°F)		 17°C
(63°F)		 23°C
(73°F)		 24°C
(75°F)		 19°C
(67°F)		 14°C
(57°F)		 8°C
(47°F)		 3°C
(37°F)
Mean minimum -4°C
(25°F)		 -3°C
(26°F)		 -2°C
(29°F)		 2°C
(36°F)		 7°C
(46°F)		 13°C
(56°F)		 19°C
(67°F)		 19°C
(67°F)		 14°C
(57°F)		 9°C
(48°F)		 2°C
(36°F)		 -2°C
(29°F)
Minimum -6°C
(21°F)		 -5°C
(24°F)		 -4°C
(24°F)		 1°C
(33°F)		 6°C
(44°F)		 11°C
(51°F)		 18°C
(65°F)		 17°C
(63°F)		 12°C
(55°F)		 8°C
(47°F)		 -0°C
(31°F)		 -5°C
(24°F)

Compare climate in Seiro with other places

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

Monthly average precipitation in Seiro, Niigata, Japan §

Seiro usually has the most precipitation in July, August and December, with an average of 21 rainy days and 288 mm (11.3 inches) of precipitation per month.The driest months in Seiro are April, May and June. On average, 139 mm (5.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Seiro, 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) 203 (8.0) 171 (6.7) 147 (5.8) 140 (5.5) 135 (5.3) 141 (5.5) 317 (12.5) 281 (11.1) 175 (6.9) 179 (7.1) 194 (7.6) 267 (10.5)
Average precipitation days (≥ 1 mm) 23 24 19 16 15 14 19 19 16 16 19 27

Monthly sunshine hours in Seiro, Niigata, Japan §

The sunniest months in Seiro are May, June and August, when the sun shines an average of 9 hours 52 minutes a day.Least sunny months in Seiro: January, February and December receive an average of 5 hours 26 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Seiro, 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 138 188 247 276 305 297 291 306 255 220 205 168
Mean daily daylight hours 9h 50m 10h 46m 11h 57m 13h 11m 14h 13m 14h 44m 14h 28m 13h 34m 12h 24m 11h 11m 10h 6m 9h 34m

Solar UV radiation in Seiro, Niigata, Japan §

Seiro experiences the highest level of ultraviolet (UV) radiation in June, 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 4. For more detailed information, check out our hourly Seiro UV Index data.

Average daily maximum UV levels by month for Seiro, 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 4 7 8 9 10 10 11 9 6 4 3