Climate Insights for Iida

Iida Shi, Nagano-ken, Japan

Hottest
August
28°C peak
Coldest
January
-5°C low
Wettest
July
355mm rain
Best to Visit
Varies throughout year

Climate Overview

The climate in Iida is temperate. The average annual temperature is 11°C and approximately 2338mm of precipitation falls per year. Iida receives a notable amount of rainfall throughout the year, including during its driest month. Iida is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are January, February, December, when temperatures can drop to -5°C. Snowfall occurs from January to December, with around 153cm accumulating over the season.

Temperature

-10° 10° 20° 30° Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Max: 3° Average: -1° Min: -5° Feb Max: 5° Average: 0° Min: -4° Mar Max: 10° Average: 5° Min: 1° Apr Max: 15° Average: 10° Min: 6° May Max: 20° Average: 15° Min: 10° Jun Max: 23° Average: 18° Min: 15° Jul Max: 27° Average: 22° Min: 19° Aug Max: 28° Average: 23° Min: 20° Sep Max: 24° Average: 20° Min: 17° Oct Max: 18° Average: 14° Min: 10° Nov Max: 12° Average: 7° Min: 3° Dec Max: 6° Average: 1° Min: -2°
Max
Average
Min

Temperatures in Iida vary considerably across the year, with a 33°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 28°C and the mean temperature sits around 23°C. The coldest month is January, when overnight lows fall to -5°C and the daily average is -1°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows. The sharpest temperature change occurs between September and October, with a 6°C shift in average temperatures.

Precipitation

0mm 50mm 100mm 150mm 200mm 250mm 300mm 350mm 400mm Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Precipitation: 95mm Snow: 45mm Feb Precipitation: 120mm Snow: 39mm Mar Precipitation: 172mm Snow: 33mm Apr Precipitation: 194mm Snow: 6mm May Precipitation: 230mm Snow: 0mm Jun Precipitation: 290mm Snow: 0mm Jul Precipitation: 355mm Snow: 0mm Aug Precipitation: 217mm Snow: 0mm Sep Precipitation: 250mm Snow: 0mm Oct Precipitation: 206mm Snow: 0mm Nov Precipitation: 113mm Snow: 5mm Dec Precipitation: 95mm Snow: 25mm
Precipitation
Snow

Iida is a very wet location, receiving approximately 2338mm of precipitation annually, which averages out to around 195mm per month. The wettest month is July, averaging 355mm of rainfall. June and September also tend to see above-average precipitation. The driest month is January, with just 95mm. That's 261mm less than July, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Snowfall is a regular feature from January to December, with around 153cm accumulating over the season. January typically sees the most snow at around 45cm.

Wind

0km/h 5km/h 10km/h Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Wind Speed: 6km/h Feb Wind Speed: 6km/h Mar Wind Speed: 6km/h Apr Wind Speed: 7km/h May Wind Speed: 6km/h Jun Wind Speed: 5km/h Jul Wind Speed: 5km/h Aug Wind Speed: 5km/h Sep Wind Speed: 5km/h Oct Wind Speed: 5km/h Nov Wind Speed: 5km/h Dec Wind Speed: 6km/h
Wind Speed

Iida is relatively calm, with an average annual wind speed of 6km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 7km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 5km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 2km/h between the calmest and windiest months.

Seasons

Winter
Dec 21
Spring
Mar 20
Summer
Jun 21
Autumn
Sep 23

2 days until Autumn

It is currently summer in Iida, which began on June 21, 2026. Iida is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 28°C, while the coldest stretch bottoms out in January near -5°C. Autumn is next, beginning on September 23, 2026 (2 days from now).

Spring

Temperatures range from 1 to 20°C. Rainfall is heavy, totalling around 595mm across the season with a monthly average of 198mm. Winds are generally light, averaging 6km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.

Summer

Temperatures range from 15 to 28°C. Rainfall is heavy, totalling around 863mm across the season with a monthly average of 288mm. Winds are generally light, averaging 5km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.

Autumn

Temperatures range from 3 to 24°C. Rainfall is heavy, totalling around 570mm across the season with a monthly average of 190mm. Expect around 5cm of snow accumulation during this period. Winds are generally light, averaging 5km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.

Winter

Temperatures range from -5 to 6°C. Rainfall is heavy, totalling around 311mm across the season with a monthly average of 104mm. Expect around 109cm of snow accumulation during this period. Winds are generally light, averaging 6km/h. Warm winter clothing and waterproof boots are a must, and travel may be affected by snow.

Monthly Climate Data

The table below shows monthly climate averages for Iida based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.

Month
Min Temperature
Max Temperature
Wind Speed
Precipitation
Snow
Jan
-5 °C
3 °C
6 km/h
95 mm
45 cm
Feb
-4 °C
5 °C
6 km/h
120 mm
39 cm
Mar
1 °C
10 °C
6 km/h
172 mm
33 cm
Apr
6 °C
15 °C
7 km/h
194 mm
6 cm
May
10 °C
20 °C
6 km/h
230 mm
0 cm
Jun
15 °C
23 °C
5 km/h
290 mm
0 cm
Jul
19 °C
27 °C
5 km/h
355 mm
0 cm
Aug
20 °C
28 °C
5 km/h
217 mm
0 cm
Sep Current
17 °C
24 °C
5 km/h
250 mm
0 cm
Oct
10 °C
18 °C
5 km/h
206 mm
0 cm
Nov
3 °C
12 °C
5 km/h
113 mm
5 cm
Dec
-2 °C
6 °C
6 km/h
95 mm
25 cm
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Metric (°C, km/h)