howmuchsun

Daylight hours in Ulan Bator

Ulan Bator gets 16h 00m of daylight on its longest day in June, and 8h 25m on its shortest in December — a difference of 7h 35m across the year.

How fast the days change

Around 17 March, Ulan Bator gains or loses about 3.5 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 Asia/Ulaanbaatar local time, daylight saving included.

MonthSunriseSunsetDaylightSolar noon
January 08:37 17:26 8h 49m 13:01
February 07:59 18:14 10h 15m 13:06
March 07:06 18:56 11h 51m 13:01
April 06:03 19:41 13h 38m 12:52
May 05:14 20:23 15h 09m 12:48
June 04:52 20:53 16h 00m 12:52
July 05:08 20:47 15h 39m 12:58
August 05:47 20:06 14h 19m 12:57
September 06:29 19:06 12h 37m 12:47
October 07:11 18:05 10h 54m 12:38
November 07:58 17:15 9h 18m 12:36
December 08:35 16:59 8h 25m 12:47

Solstices and equinoxes

DateSunriseSunsetDaylight
March equinox 20 Mar 06:55 19:04 12h 08m
June solstice 21 Jun 04:53 20:55 16h 02m
September equinox 22 Sep 06:38 18:51 12h 13m
December solstice 21 Dec 08:38 17:01 8h 23m

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.

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.

Full methodology, sources and known limitations