145 places · sun position · panel angle
Solar data for South Korea
Across the 145 places in South Korea the best fixed tilt for solar panels runs from 27° in Seogwipo to 37° in Uijeongbu-si, and flat ground gets 3.8 to 4.0 peak sun hours a day. Every number is computed for each place.
Solar power in South Korea at a glance
Averages over 145 places with climate data, for a fixed array facing south.
- 3.76–3.81
- 3.81–3.87
- 3.87–3.93
- 3.93–3.99
- 3.99–4.04
Peak sun hours a day on flat ground. Each dot is one place.
The sunniest place in South Korea is Tongyeong (Gyeongsangnam-do) with 4.04 peak sun hours a day on flat ground; the least sunny is Kosong with 3.76. A 1 kWp array at its best angle makes from 1,235 kWh a year in Seogwipo to 1,407 kWh in Changnyeong — 1,356 kWh on average.
The best year-round tilt runs from 27° in Seogwipo to 37° in Uijeongbu-si. Off-grid systems are sized for the darkest month and do better steeper, at 36° on average: at 70° that month brings 2.01 kWh per kWp a day in Yangp'yŏng and 2.21 kWh in Geoje.
Size an off-grid system or open any place below for its sun path, monthly table and tilt curve.
Sunniest places in South Korea
Ranked by peak sun hours on flat ground: the yearly average of a day's sunshine energy (NASA POWER climatology). Output: 1 kWp at its best year-round angle.
| Rank | Place | Region | Sun hours/day | kWh per kWp a year | Best tilt |
|---|---|---|---|---|---|
| 1 | Tongyeong | Gyeongsangnam-do | 4.04 | 1,385 | 32° |
| 2 | Naesŏ | Gyeongsangnam-do | 4.03 | 1,395 | 33° |
| 2 | Goseong | Gyeongsangnam-do | 4.03 | 1,386 | 33° |
| 2 | Kyosai | Gyeongsangnam-do | 4.03 | 1,379 | 32° |
| 2 | Sinhyeon | Gyeongsangnam-do | 4.03 | 1,377 | 32° |
| 6 | Changnyeong | Gyeongsangnam-do | 4.02 | 1,407 | 34° |
| 6 | Geoje | Gyeongsangnam-do | 4.02 | 1,370 | 32° |
| 8 | Changwon | Gyeongsangnam-do | 4.01 | 1,382 | 33° |
| 9 | Hwawŏn | Daegu | 4.00 | 1,405 | 35° |
| 10 | Daegu | Daegu | 3.99 | 1,399 | 35° |
Least sunny places in South Korea
Solar by region in South Korea
Averages of the places in each region, sunniest first. Darkest month: what 1 kWp of off-grid panels at 70° makes a day in the worst month of the year.
| Region | Places | Sun hours/day | kWh per kWp a year | Best tilt | Darkest month at 70° | Sunniest place |
|---|---|---|---|---|---|---|
| Gyeongsangnam-do | 14 | 4.00 | 1,380 | 33° | 2.18 kWh | Tongyeong |
| Daegu | 2 | 3.99 | 1,402 | 35° | 2.16 kWh | Hwawŏn |
| Busan | 2 | 3.95 | 1,350 | 32° | 2.19 kWh | Busan |
| Gyeongsangbuk-do | 18 | 3.94 | 1,380 | 34° | 2.16 kWh | Waegwan |
| Jeollanam-do | 18 | 3.92 | 1,337 | 31° | 2.14 kWh | Yeosu |
| Ulsan | 1 | 3.92 | 1,347 | 33° | 2.18 kWh | Ulsan |
| Gwangju | 2 | 3.91 | 1,328 | 31° | 2.14 kWh | Gwangju |
| Jeollabuk-do | 13 | 3.89 | 1,345 | 33° | 2.12 kWh | Nangen |
| Chungcheongnam-do | 14 | 3.89 | 1,353 | 34° | 2.11 kWh | Taesal-li |
| Incheon | 2 | 3.88 | 1,374 | 36° | 2.10 kWh | Ganghwa-gun |
| Daejeon | 1 | 3.88 | 1,363 | 35° | 2.09 kWh | Daejeon |
| Sejong-si | 1 | 3.87 | 1,360 | 35° | 2.09 kWh | Sejong |
| North Chungcheong | 7 | 3.87 | 1,371 | 36° | 2.08 kWh | Yeongdong |
| Seoul | 1 | 3.86 | 1,371 | 36° | 2.06 kWh | Seoul |
| Gyeonggi-do | 28 | 3.85 | 1,370 | 36° | 2.06 kWh | Gimpo-si |
| Jeju-do | 7 | 3.81 | 1,239 | 27° | 2.14 kWh | Gaigeturi |
| Gangwon-do | 14 | 3.80 | 1,358 | 36° | 2.11 kWh | Neietsu |
Largest places in South Korea at a glance
| Place | Latitude | Best tilt | Off-grid tilt | Sun hours/day (flat) |
|---|---|---|---|---|
| Seoul | 37.6° N | 36° | 32° | 3.86 |
| Busan | 35.1° N | 32° | 37° | 3.96 |
| Incheon | 37.5° N | 35° | 36° | 3.88 |
| Daegu | 35.9° N | 35° | 30° | 3.99 |
| Daejeon | 36.3° N | 35° | 33° | 3.88 |
| Gwangju | 35.2° N | 31° | 44° | 3.91 |
| Suwon | 37.3° N | 35° | 33° | 3.86 |
| Ulsan | 35.5° N | 33° | 34° | 3.92 |
| Goyang-si | 37.7° N | 36° | 33° | 3.86 |
| Changwon | 35.2° N | 33° | 33° | 4.01 |
| Seongnam-si | 37.4° N | 36° | 31° | 3.85 |
| Cheongju-si | 36.6° N | 35° | 30° | 3.86 |
| Bucheon-si | 37.5° N | 35° | 34° | 3.88 |
| Cheonan | 36.8° N | 35° | 35° | 3.87 |
| Hwaseong-si | 37.2° N | 35° | 36° | 3.88 |
| Jeonju | 35.8° N | 34° | 37° | 3.89 |
| Ansan-si | 37.3° N | 35° | 35° | 3.88 |
| Anyang-si | 37.4° N | 35° | 33° | 3.87 |
| Kimhae | 35.2° N | 33° | 35° | 3.98 |
| Pohang | 36.0° N | 33° | 35° | 3.90 |
Daylight and clock time in South Korea
In Kosong (38.4° N), the northernmost place, the longest day of the year lasts 14 h 51 min and the shortest 9 h 29 min; in Seogwipo (33.3° N), the southernmost, 14 h 21 min and 9 h 57 min. South Korea does not use daylight saving time: the clocks stay the same all year.
| Time zone | Places | UTC offset | Clocks change in 2026 |
|---|---|---|---|
| Asia/Seoul | 145 | UTC+9 | no daylight saving time |