Daylight hours in Seoul
Seoul gets 14h 45m of daylight on its longest day in June, and 9h 35m on its shortest in December — a difference of 5h 09m across the year.
How fast the days change
Around 17 March, Seoul gains or loses about 2.4 minutes of daylight every day.
Enough to notice over a fortnight, though the seasons arrive more gently here than further from the equator.
Sunrise and sunset by month
On the 15th of each month, in Asia/Seoul local time, daylight saving included.
| Month | Sunrise | Sunset | Daylight | Solar noon |
|---|---|---|---|---|
| January | 07:45 | 17:36 | 9h 51m | 12:41 |
| February | 07:21 | 18:10 | 10h 49m | 12:46 |
| March | 06:43 | 18:38 | 11h 55m | 12:41 |
| April | 05:57 | 19:06 | 13h 09m | 12:32 |
| May | 05:22 | 19:33 | 14h 11m | 12:28 |
| June | 05:10 | 19:54 | 14h 45m | 12:32 |
| July | 05:22 | 19:53 | 14h 31m | 12:38 |
| August | 05:47 | 19:25 | 13h 38m | 12:36 |
| September | 06:13 | 18:41 | 12h 27m | 12:27 |
| October | 06:40 | 17:55 | 11h 16m | 12:17 |
| November | 07:11 | 17:21 | 10h 10m | 12:16 |
| December | 07:39 | 17:14 | 9h 35m | 12:27 |
Solstices and equinoxes
| Date | Sunrise | Sunset | Daylight | |
|---|---|---|---|---|
| March equinox | 20 Mar | 06:36 | 18:43 | 12h 07m |
| June solstice | 21 Jun | 05:11 | 19:56 | 14h 46m |
| September equinox | 22 Sep | 06:19 | 18:30 | 12h 11m |
| December solstice | 21 Dec | 07:43 | 17:16 | 9h 34m |
The equinoxes give almost exactly twelve hours of daylight everywhere on earth — "almost" because sunrise is defined by the sun's upper edge rather than its centre, and the atmosphere bends its light over the horizon before it has really arrived. Both lengthen the day by a few minutes.
Other cities in South Korea
Assumptions
- Sea-level horizon. Hills, mountains and buildings all delay sunrise and bring sunset forward, sometimes by a lot in a valley.
- Standard refraction. Sunrise is taken at −0.833°, allowing for the sun's disc and average atmospheric bending. Unusual air conditions shift it by a minute or two.
- Local clock time, with daylight saving applied from the IANA timezone database.