Rittō climate — normals and trends
Rittō (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 14.3 °C and it receives 1,413 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 (26.5 °C on average) and the coldest is January (2.9 °C). Rainfall peaks in July.
Rittō averages 58 frost days, 42 hot days (≥ 30 °C) and 132 rainy days per year.
Rittō has warmed by +3.0 °C between 1940 and 2025, or +0.35 °C per decade. This trend is statistically significant.
The number of frost days there went from about 86 to 30 per year over the period.
The hottest day of the period reached 39.4 °C (on 7 August 1994) and the coldest -13.0 °C (on 10 February 1940).
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
RittōShiga
- coords
- 35.03°, 136.00°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
14.3°C
Average daily high
18.6°C
Average daily low
10.2°C
Annual rainfall
1,413mm
Sunshine / day
8.5h
Mean relative humidity
75%
Average peak wind
15.3km/h
Seasonal range
23.6°C
Frost days (< 0 °C)
58 d/yr
Hot days (≥ 30 °C)
42 d/yr
Rainy days (≥ 1 mm)
132 d/yr
Annual snowfall
17.6 cm
Average feels-like high
18.0 °C
Average feels-like low
9.4 °C
Average peak gust
37.5 km/h
Tropical nights (≥ 20 °C)
73 d/yr
Solar radiation
14.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.0 °C
since 1940
+0.4 °C per decade · r² = 0.70 · 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
39.4 °C
7 August 1994
Coldest day
-13.0 °C
10 February 1940
Wettest day
166 mm
12 May 1995
Windiest day
63.3 km/h
26 September 1959
Strongest gust
190.8 km/h
26 September 1959
Hottest feels-like
45.1 °C
8 August 1994
Coldest feels-like
-18.0 °C
21 February 1968
Snowiest day
29.8 cm
15 February 1968
Sunniest day
14.0 h
10 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 | 8.4 °C | +1.5 °C | 25 mm | -27 mm |
| Feb | 7.1 °C | -0.5 °C | 44 mm | -21 mm |
| Mar | 13.3 °C | +1.7 °C | 92 mm | -10 mm |
| Apr | 19.6 °C | +2.1 °C | 86 mm | -38 mm |
| May | 22.6 °C | +0.5 °C | 181 mm | +40 mm |
| Jun | 27.8 °C | +2.4 °C | 194 mm | -6 mm |
| Jul | 34.4 °C | +5.1 °C | 55 mm | -146 mm |
| Aug | 34.4 °C | +3.5 °C | 136 mm | +15 mm |
| Sep | 30.5 °C | +3.7 °C | 169 mm | +11 mm |
| Oct | 22.5 °C | +1.8 °C | 194 mm | +65 mm |
| Nov | 15.9 °C | +0.7 °C | 25 mm | -47 mm |
| Dec | 11.5 °C | +1.9 °C | 51 mm | +1 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 Rittō?
Rittō has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.3 °C and it receives 1,413 mm of precipitation per year.
What is the hottest day ever recorded in Rittō?
The hottest day measured in Rittō between 1940 and 2025 was 7 August 1994, reaching 39.4 °C.
What is the coldest day in Rittō?
The coldest day measured in Rittō between 1940 and 2025 was 10 February 1940, at -13.0 °C.
Does it snow in Rittō?
Yes. Rittō gets on average 17.6 cm of snow per year and has around 58 frost days.
Has the climate of Rittō warmed?
Yes: Rittō warmed by +3.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Rittō?
The wettest day measured in Rittō between 1940 and 2025 was 12 May 1995, with 166 mm of rain in 24 hours.
What was the windiest day in Rittō?
The windiest day measured in Rittō between 1940 and 2025 was 26 September 1959, with winds reaching 63.3 km/h.
What is the warmest month in Rittō?
The warmest month in Rittō is August (26.5 °C on average); the coldest is January (2.9 °C).
How much does it rain in Rittō?
Rittō receives on average 1,413 mm of precipitation per year, spread over about 132 rainy days.
Is it sunny in Rittō?
Rittō gets on average 8.5 hours of sunshine per day, roughly 3,103 hours per year over 1940-2025.
What is the biggest single-day snowfall in Rittō?
The heaviest 24-hour snowfall measured in Rittō between 1940 and 2025 was 15 February 1968, with 29.8 cm.
Are there tropical nights in Rittō?
Yes: Rittō has on average 73 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Rittō?
In Rittō, between 1940 and 2025, the highest apparent temperature reached 45.1 °C on 8 August 1994, and the lowest was -18.0 °C on 21 February 1968.
Compare Rittō with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Rittō