Daylight hours in Buenos Aires
Buenos Aires gets 14h 27m of daylight on its longest day in December, and 9h 51m on its shortest in June — a difference of 4h 37m across the year.
How fast the days change
Around 17 March, Buenos Aires gains or loses about 2.2 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 America/Argentina/Buenos_Aires local time, daylight saving included.
| Month | Sunrise | Sunset | Daylight | Solar noon |
|---|---|---|---|---|
| January | 05:56 | 20:09 | 14h 12m | 13:02 |
| February | 06:28 | 19:47 | 13h 19m | 13:07 |
| March | 06:52 | 19:11 | 12h 19m | 13:02 |
| April | 07:17 | 18:29 | 11h 13m | 12:53 |
| May | 07:40 | 17:59 | 10h 19m | 12:49 |
| June | 07:58 | 17:49 | 9h 51m | 12:54 |
| July | 07:57 | 18:01 | 10h 03m | 12:59 |
| August | 07:33 | 18:22 | 10h 50m | 12:57 |
| September | 06:52 | 18:44 | 11h 52m | 12:48 |
| October | 06:10 | 19:07 | 12h 57m | 12:39 |
| November | 05:40 | 19:36 | 13h 56m | 12:38 |
| December | 05:34 | 20:02 | 14h 27m | 12:48 |
Solstices and equinoxes
| Date | Sunrise | Sunset | Daylight | |
|---|---|---|---|---|
| March equinox | 20 Mar | 06:56 | 19:04 | 12h 08m |
| June solstice | 21 Jun | 08:00 | 17:50 | 9h 50m |
| September equinox | 22 Sep | 06:42 | 18:49 | 12h 07m |
| December solstice | 21 Dec | 05:37 | 20:05 | 14h 29m |
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 Argentina
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.