Iwade climate — normals and trends
Iwade (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 15.9 °C and it receives 1,676 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is August (27.0 °C on average) and the coldest is January (5.7 °C). Rainfall peaks in June.
Iwade averages 7 frost days, 27 hot days (≥ 30 °C) and 151 rainy days per year.
Iwade has warmed by +2.1 °C between 1940 and 2025, or +0.24 °C per decade. This trend is statistically significant.
The number of frost days there went from about 16 to 0 per year over the period.
The hottest day of the period reached 35.9 °C (on 17 August 2002) and the coldest -5.2 °C (on 14 February 1942).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
IwadeWakayama
- coords
- 34.25°, 135.32°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.9°C
Average daily high
19.0°C
Average daily low
12.9°C
Annual rainfall
1,676mm
Sunshine / day
9.0h
Mean relative humidity
73%
Average peak wind
18.9km/h
Seasonal range
21.3°C
Frost days (< 0 °C)
7 d/yr
Hot days (≥ 30 °C)
27 d/yr
Rainy days (≥ 1 mm)
151 d/yr
Annual snowfall
11.9 cm
Average feels-like high
18.6 °C
Average feels-like low
11.6 °C
Average peak gust
39.0 km/h
Tropical nights (≥ 20 °C)
93 d/yr
Solar radiation
14.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.1 °C
since 1940
+0.2 °C per decade · r² = 0.67 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
35.9 °C
17 August 2002
Coldest day
-5.2 °C
14 February 1942
Wettest day
189 mm
22 October 2017
Windiest day
76.0 km/h
26 September 1959
Strongest gust
169.2 km/h
26 September 1959
Hottest feels-like
40.6 °C
3 August 2024
Coldest feels-like
-11.5 °C
26 February 1981
Snowiest day
15.5 cm
15 February 1968
Sunniest day
14.0 h
28 May 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 8.9 °C | +0.4 °C | 46 mm | -34 mm |
| Feb | 7.6 °C | -1.4 °C | 46 mm | -40 mm |
| Mar | 13.3 °C | +0.8 °C | 90 mm | -26 mm |
| Apr | 18.3 °C | +0.7 °C | 69 mm | -65 mm |
| May | 21.8 °C | +0.3 °C | 258 mm | +98 mm |
| Jun | 26.2 °C | +1.6 °C | 208 mm | -35 mm |
| Jul | 31.3 °C | +3.0 °C | 82 mm | -117 mm |
| Aug | 31.5 °C | +1.5 °C | 218 mm | +90 mm |
| Sep | 29.3 °C | +2.5 °C | 145 mm | -53 mm |
| Oct | 23.1 °C | +1.6 °C | 256 mm | +102 mm |
| Nov | 16.7 °C | +0.4 °C | 46 mm | -54 mm |
| Dec | 12.6 °C | +1.5 °C | 64 mm | -13 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Iwade?
Iwade has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 15.9 °C and it receives 1,676 mm of precipitation per year.
What is the hottest day ever recorded in Iwade?
The hottest day measured in Iwade between 1940 and 2025 was 17 August 2002, reaching 35.9 °C.
What is the coldest day in Iwade?
The coldest day measured in Iwade between 1940 and 2025 was 14 February 1942, at -5.2 °C.
Does it snow in Iwade?
Yes. Iwade gets on average 11.9 cm of snow per year and has around 7 frost days.
Has the climate of Iwade warmed?
Yes: Iwade warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Iwade?
The wettest day measured in Iwade between 1940 and 2025 was 22 October 2017, with 189 mm of rain in 24 hours.
What was the windiest day in Iwade?
The windiest day measured in Iwade between 1940 and 2025 was 26 September 1959, with winds reaching 76.0 km/h.
What is the warmest month in Iwade?
The warmest month in Iwade is August (27.0 °C on average); the coldest is January (5.7 °C).
How much does it rain in Iwade?
Iwade receives on average 1,676 mm of precipitation per year, spread over about 151 rainy days.
Is it sunny in Iwade?
Iwade gets on average 9.0 hours of sunshine per day, roughly 3,285 hours per year over 1940-2025.
What is the biggest single-day snowfall in Iwade?
The heaviest 24-hour snowfall measured in Iwade between 1940 and 2025 was 15 February 1968, with 15.5 cm.
Are there tropical nights in Iwade?
Yes: Iwade has on average 93 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Iwade?
In Iwade, between 1940 and 2025, the highest apparent temperature reached 40.6 °C on 3 August 2024, and the lowest was -11.5 °C on 26 February 1981.
Compare Iwade with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Iwade