Climate and average weather in Onsŏng
In Onsŏng, the summers are warm, showery, and partly cloudy and the winters are frigid, snowy, and mostly clear.
Over the course of the year, the temperature in Onsŏng typically varies from -18°C to 25°C, and is rarely below -24°C or above 31°C. August is the hottest month of the year, while January is the coldest.
Based on the travel score, the best time of year to visit Onsŏng for warm-weather activities is from mid May to early October.
- Hottest
- Aug
- 25°
- Coldest
- Jan
- -18°
- Wettest
- Jul
- 137 mm
- Driest
- Jan
- 9 mm
- Rain / yr
- 647 mm
- 87 wet days
- Daylight
- 8.8–15.2 h
- shortest–longest
- Elevation
- 83 m
- 43.0°N
- Clearest
- Jan
- 37% cloud
Onsŏng weather by month, at a glance
The whole year in one picture — sky, rain, humidity, temperature and travel score. Click any band to jump to its full chart.
Each stripe is one measure across the whole year, stacked so a single day reads top to bottom. The sky band runs overcast grey on top down to clear blue at the base — more blue means sunnier — followed by the rainfall curve, the humidity band, a temperature strip that tints each stretch of the year by how warm its average high is, and the travel-score line at the foot. Scan straight down any date to read that day across every measure at once; the score climbs highest around mid May to early October.
Temperature through the year
Daily average highs and lows in Onsŏng, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 4.8 months, from May 10 to October 2, with daily high temperatures above 17°C. The hottest month of the year in Onsŏng is August, with an average high of 25°C and low of 17°C.
The cool season lasts 2.9 months, from November 26 to February 22, with daily high temperatures below -1°C. The coldest month of the year in Onsŏng is January, with an average low of -18°C and high of -7°C.
Days typically run about 10°C warmer than nights, with the widest day–night swing (around 12°C) in April.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | -7 | -3 | 4 | 13 | 18 | 22 | 25 | 25 | 21 | 13 | 3 | -6 |
| Avg low (°C) | -18 | -15 | -7 | 1 | 7 | 13 | 17 | 17 | 10 | 2 | -6 | -15 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | -7 | -18 |
| Feb | -3 | -15 |
| Mar | 4 | -7 |
| Apr | 13 | 1 |
| May | 18 | 7 |
| Jun | 22 | 13 |
| Jul | 25 | 17 |
| Aug | 25 | 17 |
| Sep | 21 | 10 |
| Oct | 13 | 2 |
| Nov | 3 | -6 |
| Dec | -6 | -15 |
How hot and cold Onsŏng really feels
The felt-temperature range through the year — heat index on the day's high (summer humidity), wind chill on the night's low (winter wind). The dashed lines are the plain thermometer; the gap is how much hotter or colder it really feels.
On the coldest nights, wind chill pulls the feels-like down to about -25°C (around January 17), with roughly 192 freezing days a year (feels-like at or below 0°C) — 127 of them bitterly cold — worst in January.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°C) | -7 | -3 | 4 | 13 | 18 | 22 | 25 | 25 | 21 | 13 | 3 | -6 |
| Air high (°C) | -7 | -3 | 4 | 13 | 18 | 22 | 25 | 25 | 21 | 13 | 3 | -6 |
| Feels-like low (°C) | -25 | -21 | -12 | -2 | 5 | 12 | 17 | 17 | 9 | -1 | -11 | -21 |
| Air low (°C) | -18 | -15 | -7 | 1 | 7 | 13 | 17 | 17 | 10 | 2 | -6 | -15 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | -7 | -7 | -25 | -18 |
| Feb | -3 | -3 | -21 | -15 |
| Mar | 4 | 4 | -12 | -7 |
| Apr | 13 | 13 | -2 | 1 |
| May | 18 | 18 | 5 | 7 |
| Jun | 22 | 22 | 12 | 13 |
| Jul | 25 | 25 | 17 | 17 |
| Aug | 25 | 25 | 17 | 17 |
| Sep | 21 | 21 | 9 | 10 |
| Oct | 13 | 13 | -1 | 2 |
| Nov | 3 | 3 | -11 | -6 |
| Dec | -6 | -6 | -21 | -15 |
Average hourly temperature in Onsŏng
A compact picture of the whole year, hour by hour: each column is a day, each row an hour, and the color is the modeled average temperature. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
Read left to right for the day of the year and top to bottom for the hour of the day; the color is the modeled temperature, cool blues through to hot reds on the same scale as the other charts. A vertical slice is a single day's swing — coolest just before dawn, warmest in the mid-afternoon — while a horizontal slice follows one hour across the seasons. The darker overlay marks night and the lighter one the twilight around sunrise and sunset. Colors run warmest on August afternoons, near 25°C, and coldest before dawn in January, near -18°C.
Onsŏng weather by month
Every month at a glance. Click a month for its detailed page.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | -7° / -18° | 9 | 1.5 | 1.9 | 9.2 | 0.0 |
| Feb | -3° / -15° | 10 | 2.1 | 2.6 | 10.2 | 0.0 |
| Mar | 4° / -7° | 23 | 5 | 4.2 | 11.6 | 0.4 |
| Apr | 13° / 1° | 43 | 7.4 | 2.5 | 13.1 | 3.6 |
| May | 18° / 7° | 79 | 11.8 | 0.3 | 14.4 | 5.6 |
| Jun | 22° / 13° | 76 | 11.7 | 0 | 15.1 | 6.2 |
| Jul | 25° / 17° | 137 | 13.1 | 0 | 14.8 | 6.2 |
| Aug | 25° / 17° | 129 | 12.4 | 0 | 13.8 | 6.3 |
| Sep | 21° / 10° | 65 | 8.1 | 0 | 12.3 | 6.8 |
| Oct | 13° / 2° | 40 | 6.3 | 0.9 | 10.8 | 4.3 |
| Nov | 3° / -6° | 26 | 4.8 | 3.4 | 9.5 | 0.3 |
| Dec | -6° / -15° | 11 | 2.7 | 3 | 8.9 | 0.0 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Onsŏng gets about 647 mm of precipitation a year. On a typical day the chance of rain is some rain, but that rises and falls sharply with the seasons.
The wetter season lasts 5.3 months, from around Apr 13 to Sep 21, peaking in July at about 43% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Jan 26.
July is the wettest month by volume, with 137 mm over about 13 wet days; January is the driest, with 9 mm. Some of the cold-season precipitation falls as snow.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 5 | 8 | 16 | 26 | 37 | 39 | 41 | 40 | 28 | 20 | 16 | 9 |
| Rain days | 2 | 2 | 5 | 7 | 12 | 12 | 13 | 12 | 8 | 6 | 5 | 3 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 5 | 2 |
| Feb | 8 | 2 |
| Mar | 16 | 5 |
| Apr | 26 | 7 |
| May | 37 | 12 |
| Jun | 39 | 12 |
| Jul | 41 | 13 |
| Aug | 40 | 12 |
| Sep | 28 | 8 |
| Oct | 20 | 6 |
| Nov | 16 | 5 |
| Dec | 9 | 3 |
Monthly rainfall
Over a full year, Onsŏng collects about 647 mm of rain across 87 wet days — roughly 54 mm in an average month.
It doesn’t fall evenly. July is the wettest month with 137 mm, while January is the driest at just 9 mm. The three wettest months alone bring about 53% of the year’s total, and some of the cold-season precipitation falls as snow.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 9 | 10 | 23 | 43 | 79 | 76 | 137 | 129 | 65 | 40 | 26 | 11 |
| Rain days | 2 | 2 | 5 | 7 | 12 | 12 | 13 | 12 | 8 | 6 | 5 | 3 |
| Snow days | 2 | 3 | 4 | 3 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 3 |
| Rainfall (mm) | Rain days | Snow days | |
|---|---|---|---|
| Jan | 9 | 2 | 2 |
| Feb | 10 | 2 | 3 |
| Mar | 23 | 5 | 4 |
| Apr | 43 | 7 | 3 |
| May | 79 | 12 | 0 |
| Jun | 76 | 12 | 0 |
| Jul | 137 | 13 | 0 |
| Aug | 129 | 12 | 0 |
| Sep | 65 | 8 | 0 |
| Oct | 40 | 6 | 1 |
| Nov | 26 | 5 | 3 |
| Dec | 11 | 3 | 3 |
Snow in Onsŏng
Average snowy days through the year, the snow-season span, and estimated snowfall — for ski trips and the perennial 'will there be snow at Christmas?' question.
Onsŏng averages about 19 snowy days a year. Snow season runs roughly Oct 12 to May 9 — about 6.9 months.
March is snowiest, with roughly 4 days of snow and an estimated 17 cm of snowfall. Over the year that adds up to an estimated 89 cm of snow.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snow days | 2 | 3 | 4 | 3 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 3 |
| Snowfall (cm) | 10 | 13 | 17 | 16 | 1 | 0 | 0 | 0 | 0 | 3 | 20 | 10 |
| Snow days | Snowfall (cm) | |
|---|---|---|
| Jan | 2 | 10 |
| Feb | 3 | 13 |
| Mar | 4 | 17 |
| Apr | 3 | 16 |
| May | 0 | 1 |
| Jun | 0 | 0 |
| Jul | 0 | 0 |
| Aug | 0 | 0 |
| Sep | 0 | 0 |
| Oct | 1 | 3 |
| Nov | 3 | 20 |
| Dec | 3 | 10 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Onsŏng, the average share of the sky covered by clouds shows significant seasonal variation over the course of the year.
The clearer part of the year begins around September 10 and lasts for 5.7 months, ending around March 1. The clearest month is January, when the sky is clear, mostly clear, or partly cloudy 73% of the time on average.
The cloudier part of the year begins around March 2 and lasts for 6.3 months, ending around September 9. The cloudiest month is July, when it is overcast or mostly cloudy 69% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 73 | 64 | 51 | 45 | 43 | 35 | 31 | 38 | 57 | 66 | 65 | 69 |
| Cloudier (%) | 27 | 36 | 49 | 55 | 57 | 65 | 69 | 62 | 43 | 34 | 35 | 31 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 73 | 27 |
| Feb | 64 | 36 |
| Mar | 51 | 49 |
| Apr | 45 | 55 |
| May | 43 | 57 |
| Jun | 35 | 65 |
| Jul | 31 | 69 |
| Aug | 38 | 62 |
| Sep | 57 | 43 |
| Oct | 66 | 34 |
| Nov | 65 | 35 |
| Dec | 69 | 31 |
Daylight, sunrise and sunset
Hours of daylight through the year, with sunrise and sunset times.
The gold band is daylight — sunrise runs along its lower edge, sunset along the upper — so it widens toward summer and pinches toward winter, with night the dark area above and below. The longest day, around June 16, brings about 15 h 12 min of light; the shortest, around December 16, only 8 h 48 min — a swing of roughly 6 h 24 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 9.2 | 10.2 | 11.6 | 13.1 | 14.4 | 15.1 | 14.8 | 13.8 | 12.3 | 10.8 | 9.5 | 8.9 |
| Sunrise (AM) | 7:54 | 7:27 | 6:41 | 5:45 | 5:03 | 4:46 | 4:59 | 5:31 | 6:06 | 6:41 | 7:20 | 7:51 |
| Sunset (PM) | 5:04 | 5:42 | 6:19 | 6:55 | 7:30 | 7:55 | 7:52 | 7:17 | 6:23 | 5:29 | 4:50 | 4:42 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 9.2 | 7:54 | 5:04 |
| Feb | 10.2 | 7:27 | 5:42 |
| Mar | 11.6 | 6:41 | 6:19 |
| Apr | 13.1 | 5:45 | 6:55 |
| May | 14.4 | 5:03 | 7:30 |
| Jun | 15.1 | 4:46 | 7:55 |
| Jul | 14.8 | 4:59 | 7:52 |
| Aug | 13.8 | 5:31 | 7:17 |
| Sep | 12.3 | 6:06 | 6:23 |
| Oct | 10.8 | 6:41 | 5:29 |
| Nov | 9.5 | 7:20 | 4:50 |
| Dec | 8.9 | 7:51 | 4:42 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Onsŏng averages about 11 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 5 and 18 days.
The sunnier stretch runs 5.6 months, from around Sep 10 to Feb 27. The sunniest month is January, with roughly 17 sunny days (bright).
The greyest month is July, down near 5 sunny days — about 70% fewer than the January peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 18 | 13 | 10 | 7 | 7 | 6 | 5 | 7 | 12 | 16 | 15 | 16 |
| Sky | Bright | Mixed | Mixed | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Mixed | Bright | Mixed | Bright |
| Sunny days | Sky | |
|---|---|---|
| Jan | 18 | Bright |
| Feb | 13 | Mixed |
| Mar | 10 | Mixed |
| Apr | 7 | Gloomy |
| May | 7 | Gloomy |
| Jun | 6 | Gloomy |
| Jul | 5 | Gloomy |
| Aug | 7 | Gloomy |
| Sep | 12 | Mixed |
| Oct | 16 | Bright |
| Nov | 15 | Mixed |
| Dec | 16 | Bright |
Humidity comfort
Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.
Humidity comfort is graded by the dew point — the temperature at which the air would be fully saturated — because it tracks how muggy it actually feels far better than relative humidity does. A low dew point feels dry and crisp; a high one feels sticky and oppressive no matter the reading on a humidity gauge.
In Onsŏng, how humid it feels changes dramatically over the year.
The more humid part of the year lasts 2.9 months, from around June 17 to September 11. The muggiest month is August, when the air feels humid, muggy or worse about 73% of the time.
The most comfortable stretch runs from around September 12 to June 16, and May is the most comfortable month — the air is dry or comfortable 100% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 97 | 49 | 5 | 9 | 67 | 99 | 100 | 100 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 3 | 33 | 21 | 19 | 20 | 1 | 0 | 0 |
| Humid (%) | 0 | 0 | 0 | 0 | 0 | 16 | 40 | 36 | 10 | 0 | 0 | 0 |
| Muggy (%) | 0 | 0 | 0 | 0 | 0 | 2 | 28 | 30 | 3 | 0 | 0 | 0 |
| Oppressive (%) | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 8 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| Jan | 100 | 0 | 0 | 0 | 0 |
| Feb | 100 | 0 | 0 | 0 | 0 |
| Mar | 100 | 0 | 0 | 0 | 0 |
| Apr | 100 | 0 | 0 | 0 | 0 |
| May | 97 | 3 | 0 | 0 | 0 |
| Jun | 49 | 33 | 16 | 2 | 0 |
| Jul | 5 | 21 | 40 | 28 | 6 |
| Aug | 9 | 19 | 36 | 30 | 8 |
| Sep | 67 | 20 | 10 | 3 | 0 |
| Oct | 99 | 1 | 0 | 0 | 0 |
| Nov | 100 | 0 | 0 | 0 | 0 |
| Dec | 100 | 0 | 0 | 0 | 0 |
Wind
Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.
This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.
Across the year, average wind speed in Onsŏng is typically calm, near 9 km/h, and varies little with the seasons.
The windier part of the year lasts 6.5 months, from around Oct 23 to May 7. The windiest month is January, averaging about 11 km/h (calm).
The calmer part of the year runs from around May 8 to Oct 22, with August the calmest month at about 7 km/h.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 11 | 10 | 10 | 10 | 9 | 8 | 7 | 7 | 7 | 9 | 10 | 11 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 11 | calm |
| Feb | 10 | calm |
| Mar | 10 | calm |
| Apr | 10 | calm |
| May | 9 | calm |
| Jun | 8 | calm |
| Jul | 7 | calm |
| Aug | 7 | calm |
| Sep | 7 | calm |
| Oct | 9 | calm |
| Nov | 10 | calm |
| Dec | 11 | calm |
Hazard calendar for Onsŏng
When the seasonal hazards worth planning around — the rainy season, tropical-cyclone risk and dust haze — are active through the year.
Onsŏng's rainy season runs May–September, when most of the year's rain falls.
Best time to visit Onsŏng
To characterize how pleasant the weather is in Onsŏng throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around late May, Onsŏng is still near the start of its best-weather window — great conditions with the peak-season crowds not yet at full swing.
Inferred from the travel-score curve; month-by-month visitor numbers are a planned addition.
The travel score favors clear, rainless days with daytime highs between 18°C and 28°C. Based on this score, the best time of year to visit Onsŏng for general outdoor tourist activities is from mid May to early October, with a peak score in the third week of September.
The travel score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Travel score (0–10) | 0.0 | 0.0 | 0.5 | 3.6 | 5.6 | 6.1 | 6.2 | 6.3 | 6.7 | 4.3 | 0.3 | 0.0 |
| Rating | poor | poor | poor | fair | good | good | good | good | good | fair | poor | poor |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 0.0 | poor |
| Feb | 0.0 | poor |
| Mar | 0.5 | poor |
| Apr | 3.6 | fair |
| May | 5.6 | good |
| Jun | 6.1 | good |
| Jul | 6.2 | good |
| Aug | 6.3 | good |
| Sep | 6.7 | good |
| Oct | 4.3 | fair |
| Nov | 0.3 | poor |
| Dec | 0.0 | poor |
The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, the best time of year to visit Onsŏng for hot-weather activities is from late June to early September, with a peak score in the first week of August.
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
What to pack for Onsŏng, by month
Month by month, what's worth putting in the bag — from the temperature range, rain chance, sun and wind. Tap a month for a quick packing note.
For a warm-season trip around August (highs near 25°C), the essentials are light clothes and rain gear. In the cold season around January (highs near -7°C), pack a warm layer and a heavy coat.
In August, Onsŏng sees daytime highs around 25°C and nights near 17°C. Worth packing: light clothes and rain gear. About 12 days see rain.
UV index (midday) in Onsŏng by month
Clear-sky midday UV index through the year, shaded by the WHO exposure levels — how much sun protection each month calls for.
Under clear skies, the midday UV index in Onsŏng peaks around August 19 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 3 | 5 | 7 | 7 | 5 | 8 | 6 | 4 | 2 | 1 |
| Level | Low | Low | Moderate | High | High | High | High | Very high | High | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Low |
| Mar | 3 | Moderate |
| Apr | 5 | High |
| May | 7 | High |
| Jun | 7 | High |
| Jul | 5 | High |
| Aug | 8 | Very high |
| Sep | 6 | High |
| Oct | 4 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Average hourly UV index in Onsŏng
Modeled clear-sky UV for every hour of every day — when in the day sun protection actually matters.
The whole year hour by hour: each column is a day, each row an hour, and the color is the modeled clear-sky UV index — the midday peak scaled down as the sun sits lower in the sky. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
UV falls off far faster than brightness as the sun drops, so even in August the burn window is concentrated in the middle of the day: about 7 hours a day reach index 3 (protection recommended), and 3.5 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV ≥ 3 (h/day) | 0 | 0 | 2.5 | 5.5 | 7 | 7.5 | 6.5 | 7 | 6.5 | 3 | 0 | 0 |
| UV ≥ 6 (h/day) | 0 | 0 | 0 | 0 | 2.5 | 2.5 | 0 | 3.5 | 2 | 0 | 0 | 0 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 0 | 0 |
| Feb | 0 | 0 |
| Mar | 2.5 | 0 |
| Apr | 5.5 | 0 |
| May | 7 | 2.5 |
| Jun | 7.5 | 2.5 |
| Jul | 6.5 | 0 |
| Aug | 7 | 3.5 |
| Sep | 6.5 | 2 |
| Oct | 3 | 0 |
| Nov | 0 | 0 |
| Dec | 0 | 0 |
Air quality in Onsŏng by month
Average fine-particle pollution (PM2.5) through the year — so you can see which months the air is worst, not just the yearly average.
Air quality in Onsŏng is worst in March — around 47 µg/m³ PM2.5 (poor), about 2.7× the cleanest month (August, 17 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 35 | 37 | 47 | 36 | 28 | 22 | 19 | 17 | 21 | 26 | 29 | 29 |
| Level | Moderate | Poor | Poor | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 35 | Moderate |
| Feb | 37 | Poor |
| Mar | 47 | Poor |
| Apr | 36 | Poor |
| May | 28 | Moderate |
| Jun | 22 | Moderate |
| Jul | 19 | Moderate |
| Aug | 17 | Moderate |
| Sep | 21 | Moderate |
| Oct | 26 | Moderate |
| Nov | 29 | Moderate |
| Dec | 29 | Moderate |
Growing season
The growing season in Onsŏng typically lasts about 196 days, from around April 12 to October 24 — the span where a frost-free day is more likely than not. It is reliably frost-free from April 29 to October 5.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 0 | 0 | 8 | 60 | 99 | 100 | 100 | 100 | 99 | 68 | 10 | 0 |
| Frost nights | 31 | 28 | 31 | 27 | 0 | 0 | 0 | 0 | 0 | 26 | 30 | 31 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 0 | 31 |
| Feb | 0 | 28 |
| Mar | 8 | 31 |
| Apr | 60 | 27 |
| May | 99 | 0 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 99 | 0 |
| Oct | 68 | 26 |
| Nov | 10 | 30 |
| Dec | 0 | 31 |
Growing degree days
Growing degree days tally heat above 10°C: each day adds however many degrees its average temperature runs over that threshold, and cold days add nothing. Onsŏng banks about 1,131 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around August.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°C·days) | 0 | 0 | 0 | 0 | 84 | 217 | 331 | 333 | 159 | 7 | 0 | 0 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 0 |
| Feb | 0 |
| Mar | 0 |
| Apr | 0 |
| May | 84 |
| Jun | 217 |
| Jul | 331 |
| Aug | 333 |
| Sep | 159 |
| Oct | 7 |
| Nov | 0 |
| Dec | 0 |
Solar energy
Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.
Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.
Onsŏng receives about 3.9 kWh/m² a day of solar energy on average — moderate — with a clear seasonal swing between 2.0 and 5.6 kWh/m².
The brighter stretch of the year lasts 7.0 months, from around Mar 1 to Sep 29. The brightest month is May, averaging about 5.5 kWh/m² (bright).
The dimmest month is December, down near 2.0 kWh/m² — roughly 63% less than the May peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 2.5 | 3.4 | 4.5 | 5.3 | 5.4 | 5.3 | 4.5 | 4.2 | 4.2 | 3.3 | 2.3 | 2.0 |
| Level | Moderate | Moderate | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 2.5 | Moderate |
| Feb | 3.4 | Moderate |
| Mar | 4.5 | Bright |
| Apr | 5.3 | Bright |
| May | 5.4 | Bright |
| Jun | 5.3 | Bright |
| Jul | 4.5 | Bright |
| Aug | 4.2 | Bright |
| Sep | 4.2 | Bright |
| Oct | 3.3 | Moderate |
| Nov | 2.3 | Moderate |
| Dec | 2.0 | Moderate |
Where is Onsŏng?
Onsŏng sits at 43.0°N, 130.0°E, 83 m above sea level, in North Korea. The nearest listed city is Namyang-nodongjagu, 11 km away.
Topography around Onsŏng
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Onsŏng.
Within 3 km, the terrain around Onsŏng has only modest variations in elevation — a maximum elevation change of 172 m around an average of 94 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 762 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,475 m.
The land around Onsŏng is covered by cropland (82%) within 3 km, trees (61%) and cropland (27%) within 16 km, and trees (76%) within 80 km.
North Korea travel facts
- Travel advisory
- Level 4
- Do Not Travel
- Power plugs
- Type C / F
- 220 V · 50 Hz
- Safe drinking water
- 67%
- of population, 2023
- Road deaths
- 24.2
- per 100k/yr, 2019
- Income group
- Low
- World Bank
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Onsŏng (42.9572°, 129.9933°, elevation 83 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).