Ansan in Winter
In winter (December, January and February), Ansan sees average daytime highs around 3°C and overnight lows near -1°C, with 80 mm of precipitation over about 14 wet days across the season. It is the coldest season of the year and the driest season of the year.
Across winter, daytime highs hold fairly steady around 3°C. The sky is clear or mostly clear about 39% of the time across winter, and the air most often feels dry.
Winter is Ansan's weakest season of the year to visit on our travel score. For the whole year in context, see Ansan's year-round climate.
- Avg daytime high
- 3°C
- coldest season of the year
- Avg overnight low
- -1°C
- Precipitation
- 80 mm
- 14 wet days
- Avg wind
- 16 km/h
- Travel score
- 0.1
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Ansan in Winter
Across winter, daytime highs hold fairly steady around 3°C.
A typical winter day in Ansan reaches about 3°C and drops to -1°C overnight. The warmest of the three months is December, the coolest January.
How winter really feels in Ansan
Once humidity and wind are folded in, winter brings about 0 days that feel above 32°C and 90 that feel at or below 0°C.
The story in winter is cold — wind chill drags the overnight "feels like" below the raw low.
Ansan weather by month
How the three winter months (December, January and February) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 2° / -3° | 23 | 4.1 | 2.5 | 9.7 | 0.0 |
| Feb | 3° / -1° | 30 | 4.3 | 1.3 | 10.6 | 0.0 |
| Mar | 7° / 3° | 42 | 6.1 | 0.9 | 11.7 | 1.1 |
| Apr | 12° / 8° | 79 | 7.3 | 0 | 12.9 | 3.6 |
| May | 17° / 13° | 104 | 7.7 | 0 | 14 | 5.9 |
| Jun | 22° / 18° | 127 | 7.6 | 0 | 14.5 | 6.8 |
| Jul | 25° / 22° | 298 | 14.4 | 0 | 14.3 | 6.0 |
| Aug | 27° / 23° | 239 | 12.8 | 0 | 13.4 | 6.2 |
| Sep | 24° / 19° | 127 | 7.3 | 0 | 12.3 | 7.3 |
| Oct | 18° / 13° | 62 | 5.6 | 0 | 11 | 6.7 |
| Nov | 11° / 6° | 57 | 8.2 | 0.3 | 10 | 3.1 |
| Dec | 5° / -0° | 28 | 5.8 | 1.8 | 9.5 | 0.2 |
Cloud cover in Winter
The sky is clear or mostly clear about 39% of the time across winter.
Chance of precipitation in Winter
Ansan gets around 80 mm of rain and snow over 14 wet days across winter. The line is the day-by-day chance of measurable precipitation.
Humidity in Winter
Most of winter feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Winter
Winds average 16 km/h across winter.
Sunrise & sunset in Winter
Daylight runs from about 9 h 36 min in early December to 11 h 06 min by late February. The lit band spans sunrise to sunset each day.
Solar energy in Winter
Average shortwave solar energy reaching the ground each day across winter, about 2.8 kWh/m².
Hazard calendar for Ansan
In winter, Ansan overlaps its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Ansan sits in the Pacific typhoon belt; the season peaks July–October.
Ansan's rainy season runs July–August, when most of the year's rain falls.
Is winter a good time to visit Ansan?
Our two travel scores rate winter for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
winter is a weaker month for outdoor sightseeing in Ansan.
What to pack for Ansan in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, Ansan sees daytime highs around 3°C and nights near -1°C. Pack a warm layer and a heavy coat. About 14 days see rain.
Sea temperature near Ansan in Winter
The nearest coast averages about 6°C across winter — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 18 km away) is warmest in August at about 24°C and coldest in February near 4°C.
It's comfortable for a long swim from Jul 11 to Oct 13 — 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 | 17 | 21 | 24 | 23 | 20 | 15 | 10 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Refreshing | Refreshing | Cool | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 6 | Bracing |
| Feb | 4 | Bracing |
| Mar | 5 | Bracing |
| Apr | 8 | Bracing |
| May | 12 | Bracing |
| Jun | 17 | Cool |
| Jul | 21 | Refreshing |
| Aug | 24 | Refreshing |
| Sep | 23 | Refreshing |
| Oct | 20 | Cool |
| Nov | 15 | Bracing |
| Dec | 10 | Bracing |
UV index in Ansan in Winter
Clear-sky midday UV across winter averages around 2. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Ansan peaks around July 23 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 at about 2 (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) | 2 | 3 | 4 | 6 | 6 | 7 | 8 | 8 | 7 | 5 | 3 | 2 |
| Level | Low | Moderate | Moderate | High | High | High | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 4 | Moderate |
| Apr | 6 | High |
| May | 6 | High |
| Jun | 7 | High |
| Jul | 8 | Very high |
| Aug | 8 | Very high |
| Sep | 7 | High |
| Oct | 5 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Ansan in Winter
Average fine-particle pollution (PM2.5) through the year — so you can see where winter falls, not just the annual average.
Air quality in Ansan is worst in March — around 160 µg/m³ PM2.5 (very unhealthy), about 2.0× the cleanest month (August, 81 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) | 145 | 149 | 160 | 127 | 111 | 98 | 88 | 81 | 110 | 132 | 142 | 133 |
| Level | Unhealthy | Unhealthy | Very unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 145 | Unhealthy |
| Feb | 149 | Unhealthy |
| Mar | 160 | Very unhealthy |
| Apr | 127 | Unhealthy |
| May | 111 | Unhealthy |
| Jun | 98 | Unhealthy |
| Jul | 88 | Unhealthy |
| Aug | 81 | Unhealthy |
| Sep | 110 | Unhealthy |
| Oct | 132 | Unhealthy |
| Nov | 142 | Unhealthy |
| Dec | 133 | Unhealthy |
Where is Ansan?
Ansan sits at 37.3°N, 126.8°E, 15 m above sea level, in South Korea. The nearest listed city is Anyang-si, 12 km away.
Topography around Ansan
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Ansan.
Within 3 km, the terrain around Ansan has only modest variations in elevation — a maximum elevation change of 198 m around an average of 24 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 470 m; within 80 km, large variations in elevation — a maximum elevation change of 1,126 m.
The land around Ansan is covered by artificial surfaces (58%) and trees (33%) within 3 km, trees (36%) and artificial surfaces (32%) within 16 km, and trees (39%) and water (27%) 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 Ansan (37.3236°, 126.8219°, elevation 15 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.