Daylight hours in Monterrey
Monterrey gets 13h 44m of daylight on its longest day in June, and 10h 33m on its shortest in December — a difference of 3h 11m across the year.
How fast the days change
Around 17 March, Monterrey gains or loses about 1.5 minutes of daylight every day.
Barely perceptible — near the equator the length of the day hardly changes at all, and the seasons announce themselves through rain and heat instead.
Sunrise and sunset by month
On the 15th of each month, in America/Monterrey local time, daylight saving included.
| Month | Sunrise | Sunset | Daylight | Solar noon |
|---|---|---|---|---|
| January | 07:29 | 18:12 | 10h 43m | 12:50 |
| February | 07:16 | 18:34 | 11h 19m | 12:55 |
| March | 06:50 | 18:50 | 12h 00m | 12:50 |
| April | 06:18 | 19:04 | 12h 46m | 12:41 |
| May | 05:55 | 19:19 | 13h 24m | 12:37 |
| June | 05:49 | 19:33 | 13h 44m | 12:41 |
| July | 05:59 | 19:34 | 13h 35m | 12:47 |
| August | 06:14 | 19:16 | 13h 02m | 12:45 |
| September | 06:27 | 18:45 | 12h 18m | 12:36 |
| October | 06:40 | 18:13 | 11h 34m | 12:26 |
| November | 06:59 | 17:52 | 10h 53m | 12:25 |
| December | 07:20 | 17:52 | 10h 33m | 12:36 |
Solstices and equinoxes
| Date | Sunrise | Sunset | Daylight | |
|---|---|---|---|---|
| March equinox | 20 Mar | 06:44 | 18:52 | 12h 08m |
| June solstice | 21 Jun | 05:50 | 19:35 | 13h 45m |
| September equinox | 22 Sep | 06:30 | 18:37 | 12h 08m |
| December solstice | 21 Dec | 07:23 | 17:55 | 10h 32m |
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 Mexico
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.