Daylight hours in Río Gallegos
Río Gallegos gets 16h 37m of daylight on its longest day in December, and 7h 50m on its shortest in June — a difference of 8h 48m across the year.
How fast the days change
Around 12 March, Río Gallegos gains or loses about 4.0 minutes of daylight every day.
That is quick enough to notice week to week, which is why spring seems to arrive all at once this far from the equator.
Sunrise and sunset by month
On the 15th of each month, in America/Argentina/Rio_Gallegos local time, daylight saving included.
| Month | Sunrise | Sunset | Daylight | Solar noon |
|---|---|---|---|---|
| January | 05:43 | 21:49 | 16h 06m | 13:46 |
| February | 06:40 | 21:02 | 14h 22m | 13:51 |
| March | 07:30 | 20:01 | 12h 31m | 13:45 |
| April | 08:22 | 18:51 | 10h 29m | 13:37 |
| May | 09:10 | 17:56 | 8h 47m | 13:33 |
| June | 09:42 | 17:32 | 7h 50m | 13:37 |
| July | 09:35 | 17:50 | 8h 15m | 13:43 |
| August | 08:48 | 18:34 | 9h 46m | 13:41 |
| September | 07:41 | 19:23 | 11h 42m | 13:32 |
| October | 06:32 | 20:12 | 13h 40m | 13:22 |
| November | 05:34 | 21:08 | 15h 34m | 13:21 |
| December | 05:13 | 21:50 | 16h 37m | 13:32 |
Solstices and equinoxes
| Date | Sunrise | Sunset | Daylight | |
|---|---|---|---|---|
| March equinox | 20 Mar | 07:39 | 19:49 | 12h 11m |
| June solstice | 21 Jun | 09:44 | 17:33 | 7h 48m |
| September equinox | 22 Sep | 07:25 | 19:34 | 12h 09m |
| December solstice | 21 Dec | 05:15 | 21:54 | 16h 40m |
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.