Ryūō climate — normals and trends
Ryūō (Japan) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.9 °C and it receives 1,551 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 (21.1 °C on average) and the coldest is January (-4.2 °C). Rainfall peaks in July.
Ryūō averages 128 frost days, 2 hot days (≥ 30 °C) and 155 rainy days per year.
Ryūō has warmed by +3.3 °C between 1940 and 2025, or +0.38 °C per decade. This trend is statistically significant.
The number of frost days there went from about 145 to 111 per year over the period.
The hottest day of the period reached 33.2 °C (on 16 August 2007) and the coldest -26.4 °C (on 30 December 1949).
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
RyūōYamanashi
- coords
- 35.65°, 138.50°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.9°C
Average daily high
13.6°C
Average daily low
4.6°C
Annual rainfall
1,551mm
Sunshine / day
8.7h
Mean relative humidity
73%
Average peak wind
8.5km/h
Seasonal range
25.3°C
Frost days (< 0 °C)
128 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
155 d/yr
Annual snowfall
118.3 cm
Average feels-like high
12.3 °C
Average feels-like low
2.9 °C
Average peak gust
35.3 km/h
Tropical nights (≥ 20 °C)
3 d/yr
Solar radiation
14.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.3 °C
since 1940
+0.4 °C per decade · r² = 0.72 · 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
33.2 °C
16 August 2007
Coldest day
-26.4 °C
30 December 1949
Wettest day
222 mm
12 October 2019
Windiest day
34.9 km/h
27 September 1959
Strongest gust
199.1 km/h
26 September 1959
Hottest feels-like
38.1 °C
16 August 2007
Coldest feels-like
-30.9 °C
30 December 1949
Snowiest day
45.1 cm
15 February 2014
Sunniest day
14.0 h
13 June 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 | 3.7 °C | +2.5 °C | 27 mm | -28 mm |
| Feb | 3.1 °C | +0.9 °C | 27 mm | -44 mm |
| Mar | 8.8 °C | +2.4 °C | 166 mm | +54 mm |
| Apr | 15.0 °C | +2.0 °C | 90 mm | -30 mm |
| May | 18.9 °C | +1.2 °C | 158 mm | +22 mm |
| Jun | 24.4 °C | +3.8 °C | 148 mm | -49 mm |
| Jul | 27.9 °C | +3.5 °C | 167 mm | -38 mm |
| Aug | 28.8 °C | +3.4 °C | 87 mm | -78 mm |
| Sep | 24.9 °C | +3.3 °C | 185 mm | -9 mm |
| Oct | 17.0 °C | +1.2 °C | 132 mm | -26 mm |
| Nov | 11.1 °C | +0.7 °C | 30 mm | -54 mm |
| Dec | 6.0 °C | +1.6 °C | 59 mm | +5 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 Ryūō?
Ryūō has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.9 °C and it receives 1,551 mm of precipitation per year.
What is the hottest day ever recorded in Ryūō?
The hottest day measured in Ryūō between 1940 and 2025 was 16 August 2007, reaching 33.2 °C.
What is the coldest day in Ryūō?
The coldest day measured in Ryūō between 1940 and 2025 was 30 December 1949, at -26.4 °C.
Does it snow in Ryūō?
Yes. Ryūō gets on average 118.3 cm of snow per year and has around 128 frost days.
Has the climate of Ryūō warmed?
Yes: Ryūō warmed by +3.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ryūō?
The wettest day measured in Ryūō between 1940 and 2025 was 12 October 2019, with 222 mm of rain in 24 hours.
What was the windiest day in Ryūō?
The windiest day measured in Ryūō between 1940 and 2025 was 27 September 1959, with winds reaching 34.9 km/h.
What is the warmest month in Ryūō?
The warmest month in Ryūō is August (21.1 °C on average); the coldest is January (-4.2 °C).
How much does it rain in Ryūō?
Ryūō receives on average 1,551 mm of precipitation per year, spread over about 155 rainy days.
Is it sunny in Ryūō?
Ryūō gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ryūō?
The heaviest 24-hour snowfall measured in Ryūō between 1940 and 2025 was 15 February 2014, with 45.1 cm.
Are there tropical nights in Ryūō?
Yes: Ryūō has on average 3 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ryūō?
In Ryūō, between 1940 and 2025, the highest apparent temperature reached 38.1 °C on 16 August 2007, and the lowest was -30.9 °C on 30 December 1949.
Compare Ryūō with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ryūō