Iwŏn-ŭp climate — normals and trends
Iwŏn-ŭp (North Korea) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 9.3 °C and it receives 803 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 (22.3 °C on average) and the coldest is January (-4.2 °C). Rainfall peaks in August.
Iwŏn-ŭp averages 103 frost days, 0 hot days (≥ 30 °C) and 91 rainy days per year.
Iwŏn-ŭp has warmed by +2.5 °C between 1940 and 2025, or +0.29 °C per decade. This trend is statistically significant.
The number of frost days there went from about 122 to 84 per year over the period.
The hottest day of the period reached 32.1 °C (on 4 August 2018) and the coldest -19.5 °C (on 9 January 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
Iwŏn-ŭpSouth Hamgyong
- coords
- 40.32°, 128.66°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.3°C
Average daily high
11.7°C
Average daily low
6.9°C
Annual rainfall
803mm
Sunshine / day
9.1h
Mean relative humidity
74%
Average peak wind
19.4km/h
Seasonal range
26.5°C
Frost days (< 0 °C)
103 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
91 d/yr
Annual snowfall
76.4 cm
Average feels-like high
9.9 °C
Average feels-like low
4.2 °C
Average peak gust
33.7 km/h
Tropical nights (≥ 20 °C)
36 d/yr
Solar radiation
14.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °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
32.1 °C
4 August 2018
Coldest day
-19.5 °C
9 January 1940
Wettest day
143 mm
21 August 1957
Windiest day
61.3 km/h
28 August 1986
Strongest gust
114.8 km/h
10 October 2001
Hottest feels-like
37.7 °C
4 August 2018
Coldest feels-like
-26.8 °C
9 January 1940
Snowiest day
29.5 cm
23 December 1980
Sunniest day
14.9 h
27 June 1945
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 | 1.7 °C | +2.8 °C | 55 mm | +27 mm |
| Feb | 1.7 °C | +1.4 °C | 8 mm | -17 mm |
| Mar | 6.0 °C | +1.7 °C | 27 mm | -4 mm |
| Apr | 10.4 °C | +0.3 °C | 83 mm | +36 mm |
| May | 15.3 °C | +0.2 °C | 58 mm | -2 mm |
| Jun | 21.9 °C | +3.3 °C | 159 mm | +88 mm |
| Jul | 26.4 °C | +3.9 °C | 102 mm | -50 mm |
| Aug | 27.0 °C | +3.1 °C | 84 mm | -82 mm |
| Sep | 23.2 °C | +2.6 °C | 120 mm | +31 mm |
| Oct | 15.8 °C | +0.3 °C | 105 mm | +57 mm |
| Nov | 10.3 °C | +1.9 °C | 17 mm | -31 mm |
| Dec | 2.9 °C | +1.2 °C | 38 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 Iwŏn-ŭp?
Iwŏn-ŭp has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 9.3 °C and it receives 803 mm of precipitation per year.
What is the hottest day ever recorded in Iwŏn-ŭp?
The hottest day measured in Iwŏn-ŭp between 1940 and 2025 was 4 August 2018, reaching 32.1 °C.
What is the coldest day in Iwŏn-ŭp?
The coldest day measured in Iwŏn-ŭp between 1940 and 2025 was 9 January 1940, at -19.5 °C.
Does it snow in Iwŏn-ŭp?
Yes. Iwŏn-ŭp gets on average 76.4 cm of snow per year and has around 103 frost days.
Has the climate of Iwŏn-ŭp warmed?
Yes: Iwŏn-ŭp warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Iwŏn-ŭp?
The wettest day measured in Iwŏn-ŭp between 1940 and 2025 was 21 August 1957, with 143 mm of rain in 24 hours.
What was the windiest day in Iwŏn-ŭp?
The windiest day measured in Iwŏn-ŭp between 1940 and 2025 was 28 August 1986, with winds reaching 61.3 km/h.
What is the warmest month in Iwŏn-ŭp?
The warmest month in Iwŏn-ŭp is August (22.3 °C on average); the coldest is January (-4.2 °C).
How much does it rain in Iwŏn-ŭp?
Iwŏn-ŭp receives on average 803 mm of precipitation per year, spread over about 91 rainy days.
Is it sunny in Iwŏn-ŭp?
Iwŏn-ŭp gets on average 9.1 hours of sunshine per day, roughly 3,322 hours per year over 1940-2025.
What is the biggest single-day snowfall in Iwŏn-ŭp?
The heaviest 24-hour snowfall measured in Iwŏn-ŭp between 1940 and 2025 was 23 December 1980, with 29.5 cm.
Are there tropical nights in Iwŏn-ŭp?
Yes: Iwŏn-ŭp has on average 36 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Iwŏn-ŭp?
In Iwŏn-ŭp, between 1940 and 2025, the highest apparent temperature reached 37.7 °C on 4 August 2018, and the lowest was -26.8 °C on 9 January 1940.
Compare Iwŏn-ŭp with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Iwŏn-ŭp