Daylight hours in Aurora
Aurora gets 15h 12m of daylight on its longest day in June, and 9h 10m on its shortest in December — a difference of 6h 02m across the year.
How fast the days change
Around 17 March, Aurora gains or loses about 2.8 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/Chicago local time, daylight saving included.
| Month | Sunrise | Sunset | Daylight | Solar noon |
|---|---|---|---|---|
| January | 07:17 | 16:47 | 9h 30m | 12:02 |
| February | 06:48 | 17:26 | 10h 38m | 12:07 |
| March | 07:04 | 18:59 | 11h 55m | 13:02 |
| April | 06:12 | 19:33 | 13h 21m | 12:53 |
| May | 05:33 | 20:06 | 14h 33m | 12:49 |
| June | 05:17 | 20:29 | 15h 12m | 12:53 |
| July | 05:32 | 20:26 | 14h 54m | 12:59 |
| August | 06:02 | 19:53 | 13h 51m | 12:57 |
| September | 06:33 | 19:03 | 12h 29m | 12:48 |
| October | 07:05 | 18:12 | 11h 06m | 12:38 |
| November | 06:42 | 16:32 | 9h 50m | 11:37 |
| December | 07:13 | 16:23 | 9h 10m | 11:48 |
Solstices and equinoxes
| Date | Sunrise | Sunset | Daylight | |
|---|---|---|---|---|
| March equinox | 20 Mar | 06:56 | 19:05 | 12h 09m |
| June solstice | 21 Jun | 05:18 | 20:31 | 15h 13m |
| September equinox | 22 Sep | 06:41 | 18:50 | 12h 10m |
| December solstice | 21 Dec | 07:17 | 16:25 | 9h 08m |
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 States
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.