Climate averages 1991–2020
Asan weather
in April.
A mild, moderately wet month: the 7th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Asan: daytime highs average 17.4°C and nights cool to about 6.1°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 71 mm of rain on roughly 7 days, which makes April a moderately wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 07 min on an average April day.
The nearest other city in this atlas is Cheonan (13 km away). In April its highs average 17.9°C, about as warm as Asan, with 77 mm of rain.
Among the 79 cities listed in South Korea, Asan ranks joint 27th of 79 for the warmest April highs and 15th of 79 for the driest April (rainfall, lowest first). The mean April high of those 79 cities is 16.9°C; Asan is 0.5°C warmer than that mean.
From April to May, average highs rise by 5.6°C to 23.0°C, and monthly rainfall rises from 71 mm to 80 mm.
The annual picture
April in context
Monthly rainfall
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
Asan climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.6°C-4.8°C | -4.8°C | 21 | 4.1 | 9.910 h |
| February | 5.2°C-3.5°C | -3.5°C | 28 | 4.2 | 10.811 h |
| March | 10.7°C0.3°C | 0.3°C | 43 | 6.1 | 11.912 h |
| April, selected | 17.4°C6.1°C | 6.1°C | 71 | 6.9 | 13.113 h |
| May | 23.0°C12.0°C | 12.0°C | 80 | 7.3 | 14.114 h |
| June | 27.2°C17.6°C | 17.6°C | 121 | 8.3 | 14.615 h |
| July | 28.7°C21.8°C | 21.8°C | 250 | 16.0 | 14.414 h |
| August | 29.1°C22.4°C | 22.4°C | 234 | 15.0 | 13.614 h |
| September | 25.0°C17.1°C | 17.1°C | 137 | 8.1 | 12.512 h |
| October | 19.1°C10.2°C | 10.2°C | 56 | 5.1 | 11.311 h |
| November | 11.7°C3.2°C | 3.2°C | 45 | 6.2 | 10.210 h |
| December | 4.6°C-2.8°C | -2.8°C | 23 | 4.9 | 9.710 h |
Rainfall is the average of the 30 separate monthly totals. A rain 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
April in nearby cities
- Cheonan in AprilSouth Korea · 13 kmHigh 17.9°C · Low 6.3°C · 77 mm rain
- Pyeongtaek in AprilSouth Korea · 25 kmHigh 17.3°C · Low 6.0°C · 68 mm rain
- Sejong in AprilSouth Korea · 33 kmHigh 18.1°C · Low 6.4°C · 78 mm rain
- Hongseong in AprilSouth Korea · 36 kmHigh 17.1°C · Low 6.4°C · 77 mm rain
- Gongju in AprilSouth Korea · 38 kmHigh 18.2°C · Low 6.8°C · 79 mm rain
- Osan in AprilSouth Korea · 41 kmHigh 16.8°C · Low 5.7°C · 69 mm rain
- Cheongju-si in AprilSouth Korea · 46 kmHigh 18.2°C · Low 6.5°C · 79 mm rain
- Seosan in AprilSouth Korea · 49 kmHigh 15.1°C · Low 6.8°C · 69 mm rain
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 Asan) is explained once on the Asan year overview and on the Sources, method and limits page.