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Monthly climate in Iijima, Nagano, Japan

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Iijima features a humid continental climate (Dfb).Temperatures typically range between -2 °C (29 °F) and 23 °C (74 °F) through the year, but rarely can drop to -21 °C (-5 °F) or can rise to as high as 33 °C (92 °F).The average annual precipitation amounts to about 1779 mm (70.0 inches) and receives 154 rainy days on the 1 mm (0.04 inches) threshold annually.Iijima enjoys an average of 3009 hours of sunshine throughout the year, and daylight varies from 9 hours 46 minutes to 14 hours 31 minutes per day.

Monthly average temperatures in Iijima, Nagano, Japan §

The warmest months in Iijima are July, August and September, with daily mean temperatures ranging from 19 to 23 °C (66 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -2 to 1 °C (29 - 34 °F) throughout the day. On average each year, Iijima experiences 50 days above 25 °C (77.0 °F) and 109 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Iijima, Nagano, 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
(52°F)		 15°C
(59°F)		 20°C
(68°F)		 25°C
(78°F)		 29°C
(84°F)		 28°C
(82°F)		 33°C
(91°F)		 33°C
(92°F)		 30°C
(86°F)		 26°C
(78°F)		 18°C
(65°F)		 16°C
(61°F)
Mean maximum 9°C
(48°F)		 11°C
(52°F)		 17°C
(63°F)		 21°C
(71°F)		 27°C
(80°F)		 25°C
(78°F)		 30°C
(87°F)		 32°C
(89°F)		 28°C
(82°F)		 25°C
(77°F)		 18°C
(64°F)		 12°C
(54°F)
Average high 3°C
(37°F)		 4°C
(40°F)		 10°C
(50°F)		 14°C
(58°F)		 20°C
(67°F)		 22°C
(72°F)		 26°C
(78°F)		 28°C
(82°F)		 23°C
(74°F)		 18°C
(64°F)		 12°C
(54°F)		 6°C
(42°F)
Daily mean -2°C
(29°F)		 -1°C
(31°F)		 4°C
(40°F)		 9°C
(48°F)		 14°C
(58°F)		 18°C
(64°F)		 22°C
(71°F)		 23°C
(74°F)		 19°C
(66°F)		 13°C
(56°F)		 7°C
(45°F)		 1°C
(34°F)
Average low -6°C
(22°F)		 -5°C
(23°F)		 -0°C
(32°F)		 4°C
(39°F)		 9°C
(49°F)		 13°C
(56°F)		 18°C
(65°F)		 19°C
(67°F)		 15°C
(60°F)		 9°C
(49°F)		 2°C
(36°F)		 -3°C
(28°F)
Mean minimum -13°C
(9°F)		 -14°C
(8°F)		 -6°C
(22°F)		 -3°C
(26°F)		 2°C
(35°F)		 8°C
(47°F)		 15°C
(59°F)		 15°C
(60°F)		 9°C
(49°F)		 2°C
(35°F)		 -3°C
(27°F)		 -8°C
(17°F)
Minimum -18°C
(-1°F)		 -21°C
(-5°F)		 -8°C
(18°F)		 -6°C
(21°F)		 -1°C
(31°F)		 5°C
(42°F)		 14°C
(57°F)		 12°C
(54°F)		 6°C
(44°F)		 -0°C
(31°F)		 -4°C
(24°F)		 -10°C
(15°F)

Compare climate in Iijima with other places

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

Monthly average precipitation in Iijima, Nagano, Japan §

Iijima usually has the most precipitation in July, September and October, with an average of 16 rainy days and 243 mm (9.6 inches) of precipitation per month.The driest months in Iijima are January, November and December. On average, 71 mm (2.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Iijima, Nagano, 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) 71 (2.8) 82 (3.2) 146 (5.7) 148 (5.8) 161 (6.3) 151 (5.9) 315 (12.4) 150 (5.9) 166 (6.6) 247 (9.7) 65 (2.6) 77 (3.0)
Average precipitation days (≥ 1 mm) 10 9 13 12 13 14 20 15 16 14 8 10

Monthly sunshine hours in Iijima, Nagano, Japan §

The sunniest months in Iijima are April, May and August, when the sun shines an average of 9 hours 24 minutes a day.Least sunny months in Iijima: January, July and October receive an average of 7 hours 0 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Iijima, Nagano, 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 192 240 269 281 295 264 233 289 241 225 241 235
Mean daily daylight hours 10h 1m 10h 52m 11h 58m 13h 5m 14h 2m 14h 31m 14h 16m 13h 27m 12h 22m 11h 15m 10h 16m 9h 46m

Solar UV radiation in Iijima, Nagano, Japan §

Iijima experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 11 - 12, which corresponds to the Extreme category of sun exposure.January, February and December are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Iijima UV Index data.

Average daily maximum UV levels by month for Iijima, Nagano, 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) 4 6 9 10 11 11 12 12 10 7 6 4