Cheonan weather in December
In December, Cheonan sees average daytime highs of 5°C and overnight lows near -3°C, with 24 mm of precipitation across 5 wet days and about 9.5 hours of daylight. It is the 11th-warmest and 11th-wettest month of the year here.
Highs ease over the month, from about 7°C in the first days to 4°C by the end. The sky is clear or mostly clear about 38% of the time in December, and the air most often feels dry.
Daylight stretches from about 9 h 42 min at the start of December to 9 h 30 min by month's end. Set against the rest of the year, December is Cheonan's 5th-clearest and 6th-windiest month. For the whole year in context, see Cheonan's year-round climate.
- Daytime high
- 5°
- 11th warmest
- Overnight low
- -3°
- 3rd coldest
- Precipitation
- 24 mm
- 5 wet days
- Daylight
- 9 h 30 min
- 7:43 AM – 5:12 PM
- Cloud cover
- 51%
- 5th clearest
- Wind
- 9 km/h
- 6th windiest
- Solar energy
- 2.31 kWh/m²
- Travel score
- 0.3
- out of 10
Cheonan is big city of South Korea.
- Density
- 1,035/km²
- people per km²
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in December
Highs ease over the month, from about 7°C in the first days to 4°C by the end.
A typical December day in Cheonan reaches about 5°C in the afternoon and slips back to -3°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between -0°C and 11°C. Set against its neighbours, December runs about 7°C cooler than November and about 2°C warmer than January.
| 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) | 8 | 8 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Avg low (°C) | -1 | -1 | -1 | -1 | -2 | -2 | -2 | -2 | -2 | -3 | -3 | -3 | -3 | -3 | -3 | -3 | -3 | -4 | -4 | -4 | -4 | -4 | -4 | -4 | -4 | -4 | -4 | -4 | -5 | -5 | -5 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 8 | -1 |
| 2 | 8 | -1 |
| 3 | 7 | -1 |
| 4 | 7 | -1 |
| 5 | 7 | -2 |
| 6 | 7 | -2 |
| 7 | 6 | -2 |
| 8 | 6 | -2 |
| 9 | 6 | -2 |
| 10 | 6 | -3 |
| 11 | 6 | -3 |
| 12 | 5 | -3 |
| 13 | 5 | -3 |
| 14 | 5 | -3 |
| 15 | 5 | -3 |
| 16 | 5 | -3 |
| 17 | 5 | -3 |
| 18 | 5 | -4 |
| 19 | 5 | -4 |
| 20 | 5 | -4 |
| 21 | 4 | -4 |
| 22 | 4 | -4 |
| 23 | 4 | -4 |
| 24 | 4 | -4 |
| 25 | 4 | -4 |
| 26 | 4 | -4 |
| 27 | 4 | -4 |
| 28 | 4 | -4 |
| 29 | 4 | -5 |
| 30 | 4 | -5 |
| 31 | 4 | -5 |
How December really feels in Cheonan
Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 31 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in December is cold — wind chill drags the overnight "feels like" below the raw low.
Cheonan weather by month
How December compares with the rest of the year at a glance. December is the 11th-warmest and 11th-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° / -5° | 22 | 4.2 | 2.2 | 9.8 | 0.0 |
| Feb | 6° / -4° | 30 | 4.3 | 1.6 | 10.6 | 0.5 |
| Mar | 12° / 1° | 47 | 6.5 | 1.2 | 11.7 | 3.4 |
| Apr | 19° / 7° | 77 | 7.2 | 0 | 12.9 | 6.4 |
| May | 24° / 13° | 89 | 7.5 | 0 | 13.9 | 7.3 |
| Jun | 28° / 18° | 125 | 8.6 | 0 | 14.5 | 6.2 |
| Jul | 29° / 22° | 265 | 16.2 | 0 | 14.3 | 4.5 |
| Aug | 30° / 22° | 237 | 15.4 | 0 | 13.4 | 4.5 |
| Sep | 26° / 17° | 139 | 8.6 | 0 | 12.2 | 6.9 |
| Oct | 20° / 10° | 58 | 4.8 | 0 | 11 | 7.3 |
| Nov | 12° / 3° | 45 | 6.5 | 0.2 | 10 | 3.8 |
| Dec | 5° / -3° | 24 | 5 | 1.6 | 9.5 | 0.3 |
Cloud cover in December
The sky is clear or mostly clear about 38% of the time in December.
Beyond those clear spells, partly cloudy skies cover about 19% of December, with mostly cloudy or overcast conditions the remaining 43%.
| 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 (%) | 56 | 56 | 56 | 56 | 56 | 56 | 56 | 55 | 55 | 56 | 56 | 56 | 57 | 57 | 56 | 57 | 57 | 57 | 58 | 58 | 58 | 59 | 59 | 59 | 58 | 59 | 59 | 59 | 58 | 58 | 58 |
| Cloudier (%) | 44 | 44 | 44 | 44 | 44 | 44 | 44 | 45 | 45 | 44 | 44 | 44 | 43 | 43 | 44 | 43 | 43 | 43 | 42 | 42 | 42 | 41 | 41 | 41 | 42 | 41 | 41 | 41 | 42 | 42 | 42 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 56 | 44 |
| 2 | 56 | 44 |
| 3 | 56 | 44 |
| 4 | 56 | 44 |
| 5 | 56 | 44 |
| 6 | 56 | 44 |
| 7 | 56 | 44 |
| 8 | 55 | 45 |
| 9 | 55 | 45 |
| 10 | 56 | 44 |
| 11 | 56 | 44 |
| 12 | 56 | 44 |
| 13 | 57 | 43 |
| 14 | 57 | 43 |
| 15 | 56 | 44 |
| 16 | 57 | 43 |
| 17 | 57 | 43 |
| 18 | 57 | 43 |
| 19 | 58 | 42 |
| 20 | 58 | 42 |
| 21 | 58 | 42 |
| 22 | 59 | 41 |
| 23 | 59 | 41 |
| 24 | 59 | 41 |
| 25 | 58 | 42 |
| 26 | 59 | 41 |
| 27 | 59 | 41 |
| 28 | 59 | 41 |
| 29 | 58 | 42 |
| 30 | 58 | 42 |
| 31 | 58 | 42 |
Chance of precipitation in December
Cheonan gets around 24 mm of rain and snow over 5 wet days in December. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 16% and peaks near 21% on the wettest days, and about 2 days bring snow.
| 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 (%) | 21 | 21 | 21 | 20 | 20 | 20 | 19 | 19 | 18 | 18 | 17 | 17 | 16 | 16 | 15 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 14 | 14 | 15 | 15 | 15 | 15 |
| Snow chance (%) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 8 | 8 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 21 | 4 |
| 2 | 21 | 4 |
| 3 | 21 | 4 |
| 4 | 20 | 4 |
| 5 | 20 | 4 |
| 6 | 20 | 4 |
| 7 | 19 | 4 |
| 8 | 19 | 4 |
| 9 | 18 | 4 |
| 10 | 18 | 4 |
| 11 | 17 | 4 |
| 12 | 17 | 4 |
| 13 | 16 | 4 |
| 14 | 16 | 4 |
| 15 | 15 | 4 |
| 16 | 14 | 4 |
| 17 | 14 | 4 |
| 18 | 14 | 4 |
| 19 | 13 | 4 |
| 20 | 13 | 5 |
| 21 | 13 | 5 |
| 22 | 13 | 5 |
| 23 | 14 | 6 |
| 24 | 14 | 6 |
| 25 | 14 | 6 |
| 26 | 14 | 7 |
| 27 | 14 | 7 |
| 28 | 15 | 7 |
| 29 | 15 | 7 |
| 30 | 15 | 8 |
| 31 | 15 | 8 |
Humidity in December
Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, December lands in the dry band about 100% 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 (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Dry (%) | |
|---|---|
| 1 | 100 |
| 2 | 100 |
| 3 | 100 |
| 4 | 100 |
| 5 | 100 |
| 6 | 100 |
| 7 | 100 |
| 8 | 100 |
| 9 | 100 |
| 10 | 100 |
| 11 | 100 |
| 12 | 100 |
| 13 | 100 |
| 14 | 100 |
| 15 | 100 |
| 16 | 100 |
| 17 | 100 |
| 18 | 100 |
| 19 | 100 |
| 20 | 100 |
| 21 | 100 |
| 22 | 100 |
| 23 | 100 |
| 24 | 100 |
| 25 | 100 |
| 26 | 100 |
| 27 | 100 |
| 28 | 100 |
| 29 | 100 |
| 30 | 100 |
| 31 | 100 |
Wind in December
Winds average 9 km/h in December.
Across December, daily wind ranges from about 9 km/h on the calmest days to 9 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) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
| 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 | 9 | calm |
| 2 | 9 | calm |
| 3 | 9 | calm |
| 4 | 9 | calm |
| 5 | 9 | calm |
| 6 | 9 | calm |
| 7 | 9 | calm |
| 8 | 9 | calm |
| 9 | 9 | calm |
| 10 | 9 | calm |
| 11 | 9 | calm |
| 12 | 9 | calm |
| 13 | 9 | calm |
| 14 | 9 | calm |
| 15 | 9 | calm |
| 16 | 9 | calm |
| 17 | 9 | calm |
| 18 | 9 | calm |
| 19 | 9 | calm |
| 20 | 9 | calm |
| 21 | 9 | calm |
| 22 | 9 | calm |
| 23 | 9 | calm |
| 24 | 9 | calm |
| 25 | 9 | calm |
| 26 | 9 | calm |
| 27 | 9 | calm |
| 28 | 9 | calm |
| 29 | 9 | calm |
| 30 | 9 | calm |
| 31 | 9 | calm |
Sunrise & sunset in December
Daylight runs from about 9 h 42 min at the start of December to 9 h 30 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 12 minutes over December. Sunrise moves from 7:31 AM to 7:49 AM, and sunset from 5:11 PM to 5:20 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) | 9.7 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 |
| Sunrise (AM) | 7:31 | 7:32 | 7:33 | 7:34 | 7:35 | 7:36 | 7:36 | 7:37 | 7:38 | 7:39 | 7:39 | 7:40 | 7:41 | 7:42 | 7:42 | 7:43 | 7:43 | 7:44 | 7:45 | 7:45 | 7:46 | 7:46 | 7:47 | 7:47 | 7:47 | 7:48 | 7:48 | 7:48 | 7:49 | 7:49 | 7:49 |
| Sunset (PM) | 5:11 | 5:11 | 5:11 | 5:11 | 5:11 | 5:11 | 5:11 | 5:11 | 5:11 | 5:11 | 5:11 | 5:11 | 5:12 | 5:12 | 5:12 | 5:12 | 5:13 | 5:13 | 5:13 | 5:14 | 5:14 | 5:15 | 5:15 | 5:16 | 5:16 | 5:17 | 5:17 | 5:18 | 5:19 | 5:19 | 5:20 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 9.7 | 7:31 | 5:11 |
| 2 | 9.6 | 7:32 | 5:11 |
| 3 | 9.6 | 7:33 | 5:11 |
| 4 | 9.6 | 7:34 | 5:11 |
| 5 | 9.6 | 7:35 | 5:11 |
| 6 | 9.6 | 7:36 | 5:11 |
| 7 | 9.6 | 7:36 | 5:11 |
| 8 | 9.6 | 7:37 | 5:11 |
| 9 | 9.5 | 7:38 | 5:11 |
| 10 | 9.5 | 7:39 | 5:11 |
| 11 | 9.5 | 7:39 | 5:11 |
| 12 | 9.5 | 7:40 | 5:11 |
| 13 | 9.5 | 7:41 | 5:12 |
| 14 | 9.5 | 7:42 | 5:12 |
| 15 | 9.5 | 7:42 | 5:12 |
| 16 | 9.5 | 7:43 | 5:12 |
| 17 | 9.5 | 7:43 | 5:13 |
| 18 | 9.5 | 7:44 | 5:13 |
| 19 | 9.5 | 7:45 | 5:13 |
| 20 | 9.5 | 7:45 | 5:14 |
| 21 | 9.5 | 7:46 | 5:14 |
| 22 | 9.5 | 7:46 | 5:15 |
| 23 | 9.5 | 7:47 | 5:15 |
| 24 | 9.5 | 7:47 | 5:16 |
| 25 | 9.5 | 7:47 | 5:16 |
| 26 | 9.5 | 7:48 | 5:17 |
| 27 | 9.5 | 7:48 | 5:17 |
| 28 | 9.5 | 7:48 | 5:18 |
| 29 | 9.5 | 7:49 | 5:19 |
| 30 | 9.5 | 7:49 | 5:19 |
| 31 | 9.5 | 7:49 | 5:20 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 2.31 kWh/m² — the year's lowest.
For context, solar energy here swings from a low near 2.31 kWh/m² to a high of 5.88 kWh/m² in May across the year — December's 2.31 kWh/m² sits near the bottom.
| 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) | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 |
| 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 | 2.3 | Moderate |
| 2 | 2.3 | Moderate |
| 3 | 2.3 | Moderate |
| 4 | 2.3 | Moderate |
| 5 | 2.3 | Moderate |
| 6 | 2.3 | Moderate |
| 7 | 2.3 | Moderate |
| 8 | 2.3 | Moderate |
| 9 | 2.3 | Moderate |
| 10 | 2.3 | Moderate |
| 11 | 2.3 | Moderate |
| 12 | 2.3 | Moderate |
| 13 | 2.3 | Moderate |
| 14 | 2.3 | Moderate |
| 15 | 2.3 | Moderate |
| 16 | 2.3 | Moderate |
| 17 | 2.3 | Moderate |
| 18 | 2.3 | Moderate |
| 19 | 2.3 | Moderate |
| 20 | 2.3 | Moderate |
| 21 | 2.3 | Moderate |
| 22 | 2.3 | Moderate |
| 23 | 2.3 | Moderate |
| 24 | 2.4 | Moderate |
| 25 | 2.4 | Moderate |
| 26 | 2.4 | Moderate |
| 27 | 2.4 | Moderate |
| 28 | 2.4 | Moderate |
| 29 | 2.4 | Moderate |
| 30 | 2.4 | Moderate |
| 31 | 2.4 | Moderate |
Hazard calendar for Cheonan
In December, Cheonan sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Cheonan sits in the Pacific typhoon belt; the season peaks July–October.
Cheonan's rainy season runs June–September, when most of the year's rain falls.
Is December a good time to visit Cheonan?
Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
December is a weaker month for outdoor sightseeing in Cheonan.
What to pack for Cheonan in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, Cheonan sees daytime highs around 5°C and nights near -3°C. Pack a warm layer. Worth having: a heavy coat. About 5 days see rain.
Sea temperature near Cheonan in December
The nearest coast averages about 10°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 59 km away) is warmest in August at about 23°C and coldest in February near 4°C.
It's comfortable for a long swim from Jul 12 to Oct 14 — about 3.1 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 6 | 4 | 5 | 8 | 12 | 16 | 21 | 23 | 23 | 20 | 15 | 10 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Refreshing | Refreshing | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 6 | Bracing |
| Feb | 4 | Bracing |
| Mar | 5 | Bracing |
| Apr | 8 | Bracing |
| May | 12 | Bracing |
| Jun | 16 | Cool |
| Jul | 21 | Refreshing |
| Aug | 23 | Refreshing |
| Sep | 23 | Refreshing |
| Oct | 20 | Cool |
| Nov | 15 | Cool |
| Dec | 10 | Bracing |
UV index in Cheonan in December
Clear-sky midday UV in December peaks around 2. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Cheonan peaks around August 13 at about 8 (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 | 6 | 7 | 8 | 8 | 7 | 5 | 3 | 2 |
| Level | Low | Moderate | Moderate | High | High | 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 | 6 | High |
| Jun | 7 | High |
| Jul | 8 | Very high |
| Aug | 8 | Very high |
| Sep | 7 | Very high |
| Oct | 5 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Cheonan in December
Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.
Air quality in Cheonan 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 Cheonan?
Cheonan sits at 36.8°N, 127.2°E, 40 m above sea level, in South Korea. The nearest listed city is Seonghwan, 12 km away.
Topography around Cheonan
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Cheonan.
Within 3 km, the terrain around Cheonan has significant variations in elevation — a maximum elevation change of 287 m around an average of 67 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 602 m; within 80 km, large variations in elevation — a maximum elevation change of 1,032 m.
The land around Cheonan is covered by artificial surfaces (64%) and trees (26%) within 3 km, trees (51%), cropland (23%) and artificial surfaces (20%) within 16 km, and trees (55%) and cropland (22%) 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 Cheonan (36.8065°, 127.1522°, elevation 40 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).