Koesan weather in October
In October, Koesan sees average daytime highs of 19°C and overnight lows near 9°C, with 58 mm of rain across 5.2 wet days and about 11 hours of daylight. It is the 6th-warmest and 7th-wettest month of the year here.
Highs ease over the month, from about 22°C in the first days to 16°C by the end. The sky is clear or mostly clear about 47% of the time in October, and the air most often feels dry.
Daylight stretches from about 11 h 36 min at the start of October to 10 h 30 min by month's end. Set against the rest of the year, October is Koesan's 1st-clearest and 10th-windiest month. For the whole year in context, see Koesan's year-round climate.
- Daytime high
- 19°
- 6th warmest
- Overnight low
- 9°
- 7th coldest
- Rainfall
- 58 mm
- 5.2 wet days
- Daylight
- 11 hours
- 6:43 AM – 5:45 PM
- Cloud cover
- 45%
- 1st clearest
- Wind
- 8 km/h
- 10th windiest
- Solar energy
- 3.71 kWh/m²
- Travel score
- 7.0
- out of 10
Temperature in October
Highs ease over the month, from about 22°C in the first days to 16°C by the end.
A typical October day in Koesan reaches about 19°C in the afternoon and slips back to 9°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 23°C. Set against its neighbours, October runs about 6°C cooler than September and about 8°C warmer than November.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 18 | 17 | 17 | 17 | 17 | 16 | 16 | 16 |
| Avg low (°C) | 13 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 22 | 13 |
| 2 | 22 | 12 |
| 3 | 22 | 12 |
| 4 | 22 | 12 |
| 5 | 22 | 12 |
| 6 | 21 | 11 |
| 7 | 21 | 11 |
| 8 | 21 | 11 |
| 9 | 21 | 11 |
| 10 | 21 | 10 |
| 11 | 21 | 10 |
| 12 | 20 | 10 |
| 13 | 20 | 10 |
| 14 | 20 | 9 |
| 15 | 20 | 9 |
| 16 | 20 | 9 |
| 17 | 19 | 9 |
| 18 | 19 | 9 |
| 19 | 19 | 8 |
| 20 | 19 | 8 |
| 21 | 18 | 8 |
| 22 | 18 | 8 |
| 23 | 18 | 7 |
| 24 | 18 | 7 |
| 25 | 17 | 7 |
| 26 | 17 | 7 |
| 27 | 17 | 6 |
| 28 | 17 | 6 |
| 29 | 16 | 6 |
| 30 | 16 | 6 |
| 31 | 16 | 6 |
How October really feels in Koesan
Once humidity and wind are folded in, October averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
October sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Koesan weather by month
How October compares with the rest of the year at a glance. October is the 6th-warmest and 7th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 3° / -6° | 23 | 4.7 | 3.3 | 9.8 | 0.0 |
| Feb | 5° / -4° | 33 | 4.6 | 2.1 | 10.6 | 0.4 |
| Mar | 11° / 0° | 54 | 7.1 | 2.1 | 11.7 | 3.0 |
| Apr | 18° / 6° | 83 | 7.7 | 0.2 | 12.9 | 6.1 |
| May | 23° / 12° | 94 | 8 | 0 | 13.9 | 7.1 |
| Jun | 27° / 17° | 125 | 8.8 | 0 | 14.5 | 6.5 |
| Jul | 28° / 21° | 258 | 16.7 | 0 | 14.3 | 4.8 |
| Aug | 29° / 22° | 219 | 15.5 | 0 | 13.4 | 4.8 |
| Sep | 25° / 16° | 139 | 8.9 | 0 | 12.2 | 6.9 |
| Oct | 19° / 9° | 58 | 5.2 | 0 | 11 | 7.0 |
| Nov | 12° / 2° | 44 | 6.6 | 0.4 | 10 | 3.4 |
| Dec | 5° / -4° | 26 | 4.6 | 2.1 | 9.5 | 0.2 |
Cloud cover in October
The sky is clear or mostly clear about 47% of the time in October, the clearest month of the year.
Beyond those clear spells, partly cloudy skies cover about 17% of October, with mostly cloudy or overcast conditions the remaining 36%. Skies tend to open up as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 55 | 56 | 56 | 56 | 57 | 57 | 58 | 59 | 59 | 61 | 62 | 62 | 64 | 64 | 65 | 66 | 66 | 66 | 68 | 68 | 69 | 69 | 70 | 70 | 70 | 69 | 69 | 69 | 69 | 69 | 68 |
| Cloudier (%) | 45 | 44 | 44 | 44 | 43 | 43 | 42 | 41 | 41 | 39 | 38 | 38 | 36 | 36 | 35 | 34 | 34 | 34 | 32 | 32 | 31 | 31 | 30 | 30 | 30 | 31 | 31 | 31 | 31 | 31 | 32 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 55 | 45 |
| 2 | 56 | 44 |
| 3 | 56 | 44 |
| 4 | 56 | 44 |
| 5 | 57 | 43 |
| 6 | 57 | 43 |
| 7 | 58 | 42 |
| 8 | 59 | 41 |
| 9 | 59 | 41 |
| 10 | 61 | 39 |
| 11 | 62 | 38 |
| 12 | 62 | 38 |
| 13 | 64 | 36 |
| 14 | 64 | 36 |
| 15 | 65 | 35 |
| 16 | 66 | 34 |
| 17 | 66 | 34 |
| 18 | 66 | 34 |
| 19 | 68 | 32 |
| 20 | 68 | 32 |
| 21 | 69 | 31 |
| 22 | 69 | 31 |
| 23 | 70 | 30 |
| 24 | 70 | 30 |
| 25 | 70 | 30 |
| 26 | 69 | 31 |
| 27 | 69 | 31 |
| 28 | 69 | 31 |
| 29 | 69 | 31 |
| 30 | 69 | 31 |
| 31 | 68 | 32 |
Chance of precipitation in October
Koesan gets around 58 mm of rain over 5.2 wet days in October. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 17% and peaks near 20% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 20 | 19 | 19 | 18 | 18 | 18 | 17 | 17 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 16 | 16 | 16 | 17 | 17 | 17 | 18 | 18 | 19 |
| Rain chance (%) | |
|---|---|
| 1 | 20 |
| 2 | 19 |
| 3 | 19 |
| 4 | 18 |
| 5 | 18 |
| 6 | 18 |
| 7 | 17 |
| 8 | 17 |
| 9 | 16 |
| 10 | 16 |
| 11 | 15 |
| 12 | 15 |
| 13 | 15 |
| 14 | 15 |
| 15 | 15 |
| 16 | 15 |
| 17 | 15 |
| 18 | 15 |
| 19 | 15 |
| 20 | 15 |
| 21 | 15 |
| 22 | 15 |
| 23 | 16 |
| 24 | 16 |
| 25 | 16 |
| 26 | 17 |
| 27 | 17 |
| 28 | 17 |
| 29 | 18 |
| 30 | 18 |
| 31 | 19 |
Humidity in October
Most of October feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, October lands in the dry band about 86% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 62 | 64 | 66 | 68 | 71 | 73 | 76 | 77 | 79 | 81 | 84 | 86 | 87 | 88 | 89 | 90 | 91 | 93 | 93 | 94 | 95 | 96 | 97 | 97 | 98 | 98 | 98 | 98 | 99 | 99 | 99 |
| Comfortable (%) | 25 | 24 | 23 | 21 | 20 | 19 | 17 | 16 | 15 | 13 | 12 | 11 | 10 | 9 | 9 | 8 | 7 | 6 | 6 | 5 | 4 | 4 | 3 | 3 | 2 | 2 | 2 | 2 | 1 | 1 | 1 |
| Humid (%) | 11 | 10 | 9 | 9 | 8 | 7 | 6 | 6 | 5 | 5 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Muggy (%) | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| 1 | 62 | 25 | 11 | 2 |
| 2 | 64 | 24 | 10 | 2 |
| 3 | 66 | 23 | 9 | 2 |
| 4 | 68 | 21 | 9 | 2 |
| 5 | 71 | 20 | 8 | 1 |
| 6 | 73 | 19 | 7 | 1 |
| 7 | 76 | 17 | 6 | 1 |
| 8 | 77 | 16 | 6 | 1 |
| 9 | 79 | 15 | 5 | 1 |
| 10 | 81 | 13 | 5 | 1 |
| 11 | 84 | 12 | 4 | 0 |
| 12 | 86 | 11 | 3 | 0 |
| 13 | 87 | 10 | 3 | 0 |
| 14 | 88 | 9 | 3 | 0 |
| 15 | 89 | 9 | 2 | 0 |
| 16 | 90 | 8 | 2 | 0 |
| 17 | 91 | 7 | 2 | 0 |
| 18 | 93 | 6 | 1 | 0 |
| 19 | 93 | 6 | 1 | 0 |
| 20 | 94 | 5 | 1 | 0 |
| 21 | 95 | 4 | 1 | 0 |
| 22 | 96 | 4 | 0 | 0 |
| 23 | 97 | 3 | 0 | 0 |
| 24 | 97 | 3 | 0 | 0 |
| 25 | 98 | 2 | 0 | 0 |
| 26 | 98 | 2 | 0 | 0 |
| 27 | 98 | 2 | 0 | 0 |
| 28 | 98 | 2 | 0 | 0 |
| 29 | 99 | 1 | 0 | 0 |
| 30 | 99 | 1 | 0 | 0 |
| 31 | 99 | 1 | 0 | 0 |
Wind in October
Winds average 8 km/h in October.
Across October, daily wind ranges from about 8 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 8 | calm |
| 2 | 8 | calm |
| 3 | 8 | calm |
| 4 | 8 | calm |
| 5 | 8 | calm |
| 6 | 8 | calm |
| 7 | 8 | calm |
| 8 | 8 | calm |
| 9 | 8 | calm |
| 10 | 8 | calm |
| 11 | 8 | calm |
| 12 | 8 | calm |
| 13 | 8 | calm |
| 14 | 8 | calm |
| 15 | 8 | calm |
| 16 | 8 | calm |
| 17 | 8 | calm |
| 18 | 8 | calm |
| 19 | 8 | calm |
| 20 | 8 | calm |
| 21 | 8 | calm |
| 22 | 8 | calm |
| 23 | 8 | calm |
| 24 | 8 | calm |
| 25 | 8 | calm |
| 26 | 8 | calm |
| 27 | 8 | calm |
| 28 | 8 | calm |
| 29 | 8 | calm |
| 30 | 8 | calm |
| 31 | 8 | calm |
Sunrise & sunset in October
Daylight runs from about 11 h 36 min at the start of October to 10 h 30 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 66 minutes over October. Sunrise moves from 6:29 AM to 6:58 AM, and sunset from 6:07 PM to 5:27 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 11.6 | 11.6 | 11.5 | 11.5 | 11.5 | 11.4 | 11.4 | 11.4 | 11.3 | 11.3 | 11.2 | 11.2 | 11.2 | 11.1 | 11.1 | 11.0 | 11.0 | 11.0 | 10.9 | 10.9 | 10.9 | 10.8 | 10.8 | 10.7 | 10.7 | 10.7 | 10.6 | 10.6 | 10.6 | 10.5 | 10.5 |
| Sunrise (AM) | 6:29 | 6:30 | 6:31 | 6:32 | 6:32 | 6:33 | 6:34 | 6:35 | 6:36 | 6:37 | 6:38 | 6:39 | 6:40 | 6:41 | 6:42 | 6:43 | 6:44 | 6:45 | 6:46 | 6:47 | 6:47 | 6:48 | 6:49 | 6:50 | 6:51 | 6:52 | 6:53 | 6:54 | 6:55 | 6:57 | 6:58 |
| Sunset (PM) | 6:07 | 6:05 | 6:04 | 6:02 | 6:01 | 5:59 | 5:58 | 5:56 | 5:55 | 5:53 | 5:52 | 5:51 | 5:49 | 5:48 | 5:46 | 5:45 | 5:44 | 5:42 | 5:41 | 5:40 | 5:39 | 5:37 | 5:36 | 5:35 | 5:34 | 5:33 | 5:32 | 5:30 | 5:29 | 5:28 | 5:27 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.6 | 6:29 | 6:07 |
| 2 | 11.6 | 6:30 | 6:05 |
| 3 | 11.5 | 6:31 | 6:04 |
| 4 | 11.5 | 6:32 | 6:02 |
| 5 | 11.5 | 6:32 | 6:01 |
| 6 | 11.4 | 6:33 | 5:59 |
| 7 | 11.4 | 6:34 | 5:58 |
| 8 | 11.4 | 6:35 | 5:56 |
| 9 | 11.3 | 6:36 | 5:55 |
| 10 | 11.3 | 6:37 | 5:53 |
| 11 | 11.2 | 6:38 | 5:52 |
| 12 | 11.2 | 6:39 | 5:51 |
| 13 | 11.2 | 6:40 | 5:49 |
| 14 | 11.1 | 6:41 | 5:48 |
| 15 | 11.1 | 6:42 | 5:46 |
| 16 | 11.0 | 6:43 | 5:45 |
| 17 | 11.0 | 6:44 | 5:44 |
| 18 | 11.0 | 6:45 | 5:42 |
| 19 | 10.9 | 6:46 | 5:41 |
| 20 | 10.9 | 6:47 | 5:40 |
| 21 | 10.9 | 6:47 | 5:39 |
| 22 | 10.8 | 6:48 | 5:37 |
| 23 | 10.8 | 6:49 | 5:36 |
| 24 | 10.7 | 6:50 | 5:35 |
| 25 | 10.7 | 6:51 | 5:34 |
| 26 | 10.7 | 6:52 | 5:33 |
| 27 | 10.6 | 6:53 | 5:32 |
| 28 | 10.6 | 6:54 | 5:30 |
| 29 | 10.6 | 6:55 | 5:29 |
| 30 | 10.5 | 6:57 | 5:28 |
| 31 | 10.5 | 6:58 | 5:27 |
Solar energy in October
Average shortwave solar energy reaching the ground each day in October, about 3.71 kWh/m².
For context, solar energy here swings from a low near 2.37 kWh/m² to a high of 5.83 kWh/m² in May across the year — October's 3.71 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.0 | 4.0 | 4.0 | 4.0 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.8 | 3.8 | 3.8 | 3.8 | 3.7 | 3.7 | 3.7 | 3.6 | 3.6 | 3.6 | 3.5 | 3.5 | 3.5 | 3.5 | 3.4 | 3.4 | 3.3 | 3.3 | 3.3 | 3.2 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.0 | Moderate |
| 2 | 4.0 | Moderate |
| 3 | 4.0 | Moderate |
| 4 | 4.0 | Moderate |
| 5 | 3.9 | Moderate |
| 6 | 3.9 | Moderate |
| 7 | 3.9 | Moderate |
| 8 | 3.9 | Moderate |
| 9 | 3.9 | Moderate |
| 10 | 3.9 | Moderate |
| 11 | 3.9 | Moderate |
| 12 | 3.8 | Moderate |
| 13 | 3.8 | Moderate |
| 14 | 3.8 | Moderate |
| 15 | 3.8 | Moderate |
| 16 | 3.7 | Moderate |
| 17 | 3.7 | Moderate |
| 18 | 3.7 | Moderate |
| 19 | 3.6 | Moderate |
| 20 | 3.6 | Moderate |
| 21 | 3.6 | Moderate |
| 22 | 3.5 | Moderate |
| 23 | 3.5 | Moderate |
| 24 | 3.5 | Moderate |
| 25 | 3.5 | Moderate |
| 26 | 3.4 | Moderate |
| 27 | 3.4 | Moderate |
| 28 | 3.3 | Moderate |
| 29 | 3.3 | Moderate |
| 30 | 3.3 | Moderate |
| 31 | 3.2 | Moderate |
Hazard calendar for Koesan
None of Koesan's seasonal hazards are active in October. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Koesan's rainy season runs June–September, when most of the year's rain falls.
Is October a good time to visit Koesan?
Our two travel scores rate October for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
October is one of the better times to visit Koesan for general sightseeing.
What to pack for Koesan in October
From October's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In October, Koesan sees daytime highs around 19°C and nights near 9°C. Little to plan around — just the basics. About 5 days see rain.
UV index in Koesan in October
Clear-sky midday UV in October peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Koesan peaks around August 14 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 7 | 7 | 8 | 9 | 8 | 5 | 3 | 2 |
| Level | Low | Moderate | Moderate | High | High | Very high | Very high | Very high | Very high | High | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 7 | High |
| Jun | 7 | Very high |
| Jul | 8 | Very high |
| Aug | 9 | Very high |
| Sep | 8 | Very high |
| Oct | 5 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Koesan in October
Average fine-particle pollution (PM2.5) through the year — so you can see where October falls, not just the annual average.
Air quality in Koesan is worst in March — around 80 µg/m³ PM2.5 (unhealthy), about 1.8× the cleanest month (July, 45 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) | 69 | 72 | 80 | 65 | 58 | 54 | 45 | 45 | 56 | 67 | 72 | 65 |
| Level | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Poor | Poor | Poor | Unhealthy | Unhealthy | Unhealthy | Unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 69 | Unhealthy |
| Feb | 72 | Unhealthy |
| Mar | 80 | Unhealthy |
| Apr | 65 | Unhealthy |
| May | 58 | Unhealthy |
| Jun | 54 | Poor |
| Jul | 45 | Poor |
| Aug | 45 | Poor |
| Sep | 56 | Unhealthy |
| Oct | 67 | Unhealthy |
| Nov | 72 | Unhealthy |
| Dec | 65 | Unhealthy |
Where is Koesan?
Koesan sits at 36.8°N, 127.8°E, 116 m above sea level, in South Korea. The nearest listed city is Jungpyong, 19 km away.
Topography around Koesan
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Koesan.
Within 3 km, the terrain around Koesan has significant variations in elevation — a maximum elevation change of 298 m around an average of 173 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 866 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,408 m.
The land around Koesan is covered by trees (58%) within 3 km, trees (74%) within 16 km, and trees (72%) within 80 km.
South Korea travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / F
- 220 V · 60 Hz
- Prices
- ≈ 57% of US
- price level, 2025
- GDP per capita
- $36,227
- 2025
- Happiness
- 6.0 / 10
- World Happiness, 2025
- Safe drinking water
- 99%
- of population, 2024
- Homicide rate
- 0.5
- per 100k, 2023
- Road deaths
- 8.6
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 522
- Religion
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 Koesan (36.8108°, 127.7947°, elevation 116 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).