Daylight hours in Rosario
Rosario gets 14h 19m of daylight on its longest day in December, and 9h 59m on its shortest in June — a difference of 4h 19m across the year.
How fast the days change
Around 17 March, Rosario gains or loses about 2.1 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/Cordoba local time, daylight saving included.
| Month | Sunrise | Sunset | Daylight | Solar noon |
|---|---|---|---|---|
| January | 06:09 | 20:14 | 14h 04m | 13:12 |
| February | 06:39 | 19:53 | 13h 14m | 13:16 |
| March | 07:02 | 19:20 | 12h 18m | 13:11 |
| April | 07:24 | 18:40 | 11h 16m | 13:02 |
| May | 07:46 | 18:11 | 10h 26m | 12:58 |
| June | 08:03 | 18:02 | 9h 59m | 13:03 |
| July | 08:03 | 18:13 | 10h 11m | 13:08 |
| August | 07:39 | 18:34 | 10h 54m | 13:07 |
| September | 07:01 | 18:54 | 11h 53m | 12:57 |
| October | 06:21 | 19:15 | 12h 53m | 12:48 |
| November | 05:52 | 19:41 | 13h 49m | 12:47 |
| December | 05:48 | 20:07 | 14h 19m | 12:57 |
Solstices and equinoxes
| Date | Sunrise | Sunset | Daylight | |
|---|---|---|---|---|
| March equinox | 20 Mar | 07:06 | 19:13 | 12h 08m |
| June solstice | 21 Jun | 08:05 | 18:03 | 9h 58m |
| September equinox | 22 Sep | 06:51 | 18:58 | 12h 07m |
| December solstice | 21 Dec | 05:50 | 20:10 | 14h 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 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.