Ansan Temperature by Month

Ansan, Gyeonggi-do, South Korea has an average annual maximum temperature of 17°C (63°F), ranging from 3°C (37°F) in January to 29°C (84°F) in August. Below you'll find a full monthly breakdown and a comparison with cities worldwide.

Depending on the time of the year, temperatures range from warm to cold in Ansan. Nighttime lows follow the same pattern, ranging from 23°C (73°F) to -4°C (25°F).

The chart below illustrates the average maximum day and minimum night temperatures in Ansan by month:

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. August, the warmest month, sees 192 hours of sunshine.

The chart below shows the average temperature throughout the year:

Ansan's average annual maximum temperature is 17°C (63°F). To put that in context, here's how it compares to a few well-known destinations:

Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.

On the cooler end, Oslo, Norway averages just 10°C (50°F) annually, with pleasant summers but long, cold winters.

San Francisco, USA averages 19°C (66°F) annually, but with little seasonal variation, summers are often cool and foggy, winters mild.

Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate, hot dry summers and mild wet winters.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.

In Ansan, January is the coolest month, with average highs of 3°C (37°F) and humidity around 60%, considered high. In August, the warmest month, temperatures average 29°C (84°F) with 80% humidity, conditions that feel very high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

For more on Ansan's weather, including monthly rainfall, sunshine hours, and humidity, visit our Ansan climate page.