Daylight hours in Saint Helier
Saint Helier gets 16h 12m of daylight on its longest day in June, and 8h 14m on its shortest in December — a difference of 7h 59m across the year.
How fast the days change
Around 17 March, Saint Helier gains or loses about 3.7 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 Europe/Jersey local time, daylight saving included.
| Month | Sunrise | Sunset | Daylight | Solar noon |
|---|---|---|---|---|
| January | 07:57 | 16:37 | 8h 40m | 12:17 |
| February | 07:17 | 17:28 | 10h 11m | 12:22 |
| March | 06:21 | 18:13 | 11h 51m | 12:17 |
| April | 06:16 | 20:00 | 13h 43m | 13:08 |
| May | 05:25 | 20:44 | 15h 19m | 13:04 |
| June | 05:02 | 21:15 | 16h 12m | 13:08 |
| July | 05:19 | 21:09 | 15h 49m | 13:14 |
| August | 06:00 | 20:25 | 14h 25m | 13:12 |
| September | 06:44 | 19:22 | 12h 37m | 13:03 |
| October | 07:29 | 18:19 | 10h 50m | 12:54 |
| November | 07:18 | 16:27 | 9h 09m | 11:52 |
| December | 07:56 | 16:10 | 8h 14m | 12:03 |
Solstices and equinoxes
| Date | Sunrise | Sunset | Daylight | |
|---|---|---|---|---|
| March equinox | 20 Mar | 06:10 | 18:20 | 12h 10m |
| June solstice | 21 Jun | 05:03 | 21:17 | 16h 14m |
| September equinox | 22 Sep | 06:55 | 19:07 | 12h 12m |
| December solstice | 21 Dec | 08:00 | 16:12 | 8h 12m |
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.
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.