Daylight hours in Siem Reap
Siem Reap gets 12h 54m of daylight on its longest day in June, and 11h 21m on its shortest in December — a difference of 1h 34m across the year.
How fast the days change
Around 22 March, Siem Reap gains or loses about 0.8 minutes of daylight every day.
Barely perceptible — near the equator the length of the day hardly changes at all, and the seasons announce themselves through rain and heat instead.
Sunrise and sunset by month
On the 15th of each month, in Asia/Phnom_Penh local time, daylight saving included.
| Month | Sunrise | Sunset | Daylight | Solar noon |
|---|---|---|---|---|
| January | 06:31 | 17:56 | 11h 25m | 12:13 |
| February | 06:27 | 18:09 | 11h 43m | 12:18 |
| March | 06:12 | 18:14 | 12h 03m | 12:13 |
| April | 05:51 | 18:17 | 12h 26m | 12:04 |
| May | 05:38 | 18:23 | 12h 45m | 12:00 |
| June | 05:37 | 18:32 | 12h 54m | 12:05 |
| July | 05:45 | 18:35 | 12h 50m | 12:10 |
| August | 05:51 | 18:26 | 12h 34m | 12:09 |
| September | 05:53 | 18:06 | 12h 13m | 11:59 |
| October | 05:55 | 17:45 | 11h 51m | 11:50 |
| November | 06:03 | 17:34 | 11h 31m | 11:49 |
| December | 06:19 | 17:39 | 11h 21m | 11:59 |
Solstices and equinoxes
| Date | Sunrise | Sunset | Daylight | |
|---|---|---|---|---|
| March equinox | 20 Mar | 06:08 | 18:15 | 12h 07m |
| June solstice | 21 Jun | 05:38 | 18:33 | 12h 55m |
| September equinox | 22 Sep | 05:53 | 18:01 | 12h 07m |
| December solstice | 21 Dec | 06:22 | 17:42 | 11h 20m |
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 Cambodia
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.