Onsŏng climate — normals and trends
Onsŏng (North Korea) has a warm-summer humid continental, dry winter climate (Dwb) under the Köppen-Geiger classification. Its mean annual temperature is 4.5 °C and it receives 666 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 (20.4 °C on average) and the coldest is January (-14.3 °C). Rainfall peaks in August.
Onsŏng averages 174 frost days, 6 hot days (≥ 30 °C) and 94 rainy days per year.
Onsŏng has warmed by +2.6 °C between 1940 and 2025, or +0.30 °C per decade. This trend is statistically significant.
The number of frost days there went from about 181 to 167 per year over the period.
The hottest day of the period reached 35.3 °C (on 16 July 1958) and the coldest -34.9 °C (on 6 January 1951).
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
OnsŏngNorth Hamgyong
- coords
- 42.96°, 129.99°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
4.5°C
Average daily high
10.0°C
Average daily low
-0.4°C
Annual rainfall
666mm
Sunshine / day
8.8h
Mean relative humidity
69%
Average peak wind
14.6km/h
Seasonal range
34.7°C
Frost days (< 0 °C)
174 d/yr
Hot days (≥ 30 °C)
6 d/yr
Rainy days (≥ 1 mm)
94 d/yr
Annual snowfall
62.2 cm
Average feels-like high
7.5 °C
Average feels-like low
-3.1 °C
Average peak gust
39.1 km/h
Tropical nights (≥ 20 °C)
7 d/yr
Solar radiation
14.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.6 °C
since 1940
+0.3 °C per decade · r² = 0.64 · 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
35.3 °C
16 July 1958
Coldest day
-34.9 °C
6 January 1951
Wettest day
99 mm
28 July 2010
Windiest day
43.4 km/h
3 September 2020
Strongest gust
114.8 km/h
3 September 2020
Hottest feels-like
40.6 °C
24 July 2021
Coldest feels-like
-40.2 °C
6 January 1951
Snowiest day
35.6 cm
9 November 1968
Sunniest day
15.0 h
2 July 1944
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 | -4.5 °C | +4.0 °C | 14 mm | +6 mm |
| Feb | -2.7 °C | +1.7 °C | 0 mm | -11 mm |
| Mar | 5.2 °C | +2.0 °C | 13 mm | -11 mm |
| Apr | 12.7 °C | +0.4 °C | 67 mm | +21 mm |
| May | 19.6 °C | +1.3 °C | 83 mm | +8 mm |
| Jun | 26.0 °C | +4.5 °C | 90 mm | +6 mm |
| Jul | 29.3 °C | +4.9 °C | 84 mm | -43 mm |
| Aug | 26.9 °C | +2.1 °C | 198 mm | +61 mm |
| Sep | 23.3 °C | +3.1 °C | 59 mm | -12 mm |
| Oct | 12.1 °C | -0.7 °C | 33 mm | -9 mm |
| Nov | 4.7 °C | +2.5 °C | 20 mm | -8 mm |
| Dec | -5.2 °C | +1.1 °C | 9 mm | -4 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 Onsŏng?
Onsŏng has a warm-summer humid continental, dry winter climate (Köppen Dwb). Over 1940-2025, the average annual temperature is 4.5 °C and it receives 666 mm of precipitation per year.
What is the hottest day ever recorded in Onsŏng?
The hottest day measured in Onsŏng between 1940 and 2025 was 16 July 1958, reaching 35.3 °C.
What is the coldest day in Onsŏng?
The coldest day measured in Onsŏng between 1940 and 2025 was 6 January 1951, at -34.9 °C.
Does it snow in Onsŏng?
Yes. Onsŏng gets on average 62.2 cm of snow per year and has around 174 frost days.
Has the climate of Onsŏng warmed?
Yes: Onsŏng warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Onsŏng?
The wettest day measured in Onsŏng between 1940 and 2025 was 28 July 2010, with 99 mm of rain in 24 hours.
What was the windiest day in Onsŏng?
The windiest day measured in Onsŏng between 1940 and 2025 was 3 September 2020, with winds reaching 43.4 km/h.
What is the warmest month in Onsŏng?
The warmest month in Onsŏng is August (20.4 °C on average); the coldest is January (-14.3 °C).
How much does it rain in Onsŏng?
Onsŏng receives on average 666 mm of precipitation per year, spread over about 94 rainy days.
Is it sunny in Onsŏng?
Onsŏng gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.
What is the biggest single-day snowfall in Onsŏng?
The heaviest 24-hour snowfall measured in Onsŏng between 1940 and 2025 was 9 November 1968, with 35.6 cm.
Are there tropical nights in Onsŏng?
Yes: Onsŏng has on average 7 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Onsŏng?
In Onsŏng, between 1940 and 2025, the highest apparent temperature reached 40.6 °C on 24 July 2021, and the lowest was -40.2 °C on 6 January 1951.
Compare Onsŏng with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Onsŏng