Climate averages 1991–2020
Seongnam-si weather
in January.
A cold month with light precipitation: the coolest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cold month in Seongnam-si: daytime highs average 1.7°C and nights cool to about -6.3°C. By daytime temperature it is the coolest month of the year.
Expect about 20 mm of precipitation on roughly 4 days, which makes January a month with light precipitation (the driest month of the year). Daylight, from sunrise to sunset, lasts about 9 h 54 min on an average January day.
The nearest other city in this atlas is Gwangju, South Korea (11 km away). In January its highs average 2.0°C, about as warm as Seongnam-si, with 20 mm of precipitation.
Among the 79 cities listed in South Korea, Seongnam-si ranks joint 62nd of 79 for the warmest January highs and joint 11th of 79 for the driest January (precipitation, lowest first). The mean January high of those 79 cities is 3.6°C; Seongnam-si is 1.8°C cooler than that mean.
From January to February, average highs rise by 2.8°C to 4.5°C, and monthly precipitation rises from 20 mm to 29 mm.
The annual picture
January in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Seongnam-si climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 1.7°C-6.3°C | -6.3°C | 20 | 3.8 | 9.910 h |
| February | 4.5°C-4.5°C | -4.5°C | 29 | 4.2 | 10.811 h |
| March | 9.9°C-0.4°C | -0.4°C | 43 | 6.4 | 11.912 h |
| April | 16.4°C5.4°C | 5.4°C | 79 | 7.3 | 13.113 h |
| May | 21.8°C11.3°C | 11.3°C | 104 | 8.5 | 14.214 h |
| June | 26.1°C16.9°C | 16.9°C | 134 | 9.3 | 14.715 h |
| July | 27.8°C21.3°C | 21.3°C | 340 | 17.2 | 14.514 h |
| August | 28.4°C21.9°C | 21.9°C | 277 | 15.7 | 13.614 h |
| September | 24.5°C16.5°C | 16.5°C | 134 | 8.4 | 12.512 h |
| October | 18.5°C9.2°C | 9.2°C | 58 | 5.5 | 11.311 h |
| November | 10.8°C2.1°C | 2.1°C | 50 | 7.2 | 10.210 h |
| December | 3.7°C-4.3°C | -4.3°C | 25 | 4.7 | 9.610 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
January in nearby cities
- Gwangju, South Korea in JanuarySouth Korea · 11 kmHigh 2.0°C · Low -6.1°C · 20 mm precipitation
- Hanam in JanuarySouth Korea · 13 kmHigh 1.8°C · Low -6.6°C · 20 mm precipitation
- Guri-si in JanuarySouth Korea · 18 kmHigh 1.5°C · Low -6.9°C · 20 mm precipitation
- Wabu in JanuarySouth Korea · 18 kmHigh 1.5°C · Low -7.0°C · 20 mm precipitation
- Anyang-si in JanuarySouth Korea · 19 kmHigh 1.7°C · Low -5.7°C · 19 mm precipitation
- Seoul in JanuarySouth Korea · 20 kmHigh 1.6°C · Low -6.9°C · 19 mm precipitation
- Suwon in JanuarySouth Korea · 20 kmHigh 1.9°C · Low -5.9°C · 20 mm precipitation
- Gwangmyeong in JanuarySouth Korea · 24 kmHigh 1.7°C · Low -6.4°C · 18 mm precipitation
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Seongnam-si) is explained once on the Seongnam-si year overview and on the Sources, method and limits page.
Hanam, Guri-si and Wabu lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.