Daylight hours in Swindon
Swindon gets 16h 37m of daylight on its longest day in June, and 7h 51m on its shortest in December — a difference of 8h 46m across the year.
How fast the days change
Around 17 March, Swindon gains or loses about 4.0 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/London local time, daylight saving included.
| Month | Sunrise | Sunset | Daylight | Solar noon |
|---|---|---|---|---|
| January | 08:06 | 16:26 | 8h 21m | 12:16 |
| February | 07:20 | 17:21 | 10h 01m | 12:21 |
| March | 06:20 | 18:11 | 11h 50m | 12:16 |
| April | 06:10 | 20:03 | 13h 52m | 13:07 |
| May | 05:14 | 20:52 | 15h 37m | 13:03 |
| June | 04:49 | 21:26 | 16h 37m | 13:07 |
| July | 05:07 | 21:18 | 16h 11m | 13:13 |
| August | 05:52 | 20:30 | 14h 38m | 13:11 |
| September | 06:42 | 19:22 | 12h 40m | 13:02 |
| October | 07:31 | 18:14 | 10h 43m | 12:52 |
| November | 07:25 | 16:17 | 8h 52m | 11:51 |
| December | 08:06 | 15:57 | 7h 51m | 12:02 |
Solstices and equinoxes
| Date | Sunrise | Sunset | Daylight | |
|---|---|---|---|---|
| March equinox | 20 Mar | 06:09 | 18:19 | 12h 10m |
| June solstice | 21 Jun | 04:49 | 21:28 | 16h 39m |
| September equinox | 22 Sep | 06:53 | 19:06 | 12h 13m |
| December solstice | 21 Dec | 08:10 | 15:59 | 7h 49m |
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 United Kingdom
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.