Naka climate — normals and trends
Naka (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 15.0 °C and it receives 1,364 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 (26.6 °C on average) and the coldest is January (3.8 °C). Rainfall peaks in October.
Naka averages 38 frost days, 40 hot days (≥ 30 °C) and 143 rainy days per year.
Naka has warmed by +2.3 °C between 1940 and 2025, or +0.27 °C per decade. This trend is statistically significant.
The number of frost days there went from about 58 to 18 per year over the period.
The hottest day of the period reached 39.7 °C (on 4 August 1994) and the coldest -11.8 °C (on 17 February 1967).
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
NakaIbaraki
- coords
- 36.05°, 140.17°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.0°C
Average daily high
19.1°C
Average daily low
11.6°C
Annual rainfall
1,364mm
Sunshine / day
8.2h
Mean relative humidity
74%
Average peak wind
15.8km/h
Seasonal range
22.8°C
Frost days (< 0 °C)
38 d/yr
Hot days (≥ 30 °C)
40 d/yr
Rainy days (≥ 1 mm)
143 d/yr
Annual snowfall
12.2 cm
Average feels-like high
18.9 °C
Average feels-like low
10.6 °C
Average peak gust
33.7 km/h
Tropical nights (≥ 20 °C)
80 d/yr
Solar radiation
14.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.3 °C
since 1940
+0.3 °C per decade · r² = 0.63 · 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
39.7 °C
4 August 1994
Coldest day
-11.8 °C
17 February 1967
Wettest day
198 mm
26 September 1958
Windiest day
62.5 km/h
1 October 2018
Strongest gust
140.0 km/h
1 October 2018
Hottest feels-like
46.3 °C
16 August 2007
Coldest feels-like
-17.1 °C
5 February 1952
Snowiest day
27.0 cm
8 February 2014
Sunniest day
14.0 h
20 June 1962
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 | 10.6 °C | +2.1 °C | 38 mm | -15 mm |
| Feb | 10.5 °C | +1.3 °C | 10 mm | -53 mm |
| Mar | 15.1 °C | +2.4 °C | 157 mm | +55 mm |
| Apr | 19.8 °C | +1.8 °C | 119 mm | +9 mm |
| May | 22.5 °C | +0.1 °C | 180 mm | +54 mm |
| Jun | 28.5 °C | +3.4 °C | 142 mm | -12 mm |
| Jul | 32.4 °C | +3.5 °C | 74 mm | -74 mm |
| Aug | 33.6 °C | +3.2 °C | 49 mm | -79 mm |
| Sep | 30.1 °C | +3.7 °C | 137 mm | -30 mm |
| Oct | 21.4 °C | +0.5 °C | 118 mm | -53 mm |
| Nov | 16.7 °C | +0.8 °C | 48 mm | -42 mm |
| Dec | 12.1 °C | +1.2 °C | 76 mm | +21 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 Naka?
Naka has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 15.0 °C and it receives 1,364 mm of precipitation per year.
What is the hottest day ever recorded in Naka?
The hottest day measured in Naka between 1940 and 2025 was 4 August 1994, reaching 39.7 °C.
What is the coldest day in Naka?
The coldest day measured in Naka between 1940 and 2025 was 17 February 1967, at -11.8 °C.
Does it snow in Naka?
Yes. Naka gets on average 12.2 cm of snow per year and has around 38 frost days.
Has the climate of Naka warmed?
Yes: Naka warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Naka?
The wettest day measured in Naka between 1940 and 2025 was 26 September 1958, with 198 mm of rain in 24 hours.
What was the windiest day in Naka?
The windiest day measured in Naka between 1940 and 2025 was 1 October 2018, with winds reaching 62.5 km/h.
What is the warmest month in Naka?
The warmest month in Naka is August (26.6 °C on average); the coldest is January (3.8 °C).
How much does it rain in Naka?
Naka receives on average 1,364 mm of precipitation per year, spread over about 143 rainy days.
Is it sunny in Naka?
Naka gets on average 8.2 hours of sunshine per day, roughly 2,993 hours per year over 1940-2025.
What is the biggest single-day snowfall in Naka?
The heaviest 24-hour snowfall measured in Naka between 1940 and 2025 was 8 February 2014, with 27.0 cm.
Are there tropical nights in Naka?
Yes: Naka has on average 80 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Naka?
In Naka, between 1940 and 2025, the highest apparent temperature reached 46.3 °C on 16 August 2007, and the lowest was -17.1 °C on 5 February 1952.
Compare Naka with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Naka