Daylight Hours vary dramatically during the year in Iceland because of its position on the globe.


Around December 21st. daylight is limited and the sun only peaks 2.7° over the horizon at noon in Reykjavik.
Around June 21st. there is daylight around the clock and the angle of the sun is 49.3° at noon in Reykjavik.

More darkness in the winter translates to more hours with possibility of seeing the Northern Lights.

Below one can see how the daylight hours change in Reykjavik during 2018:


2017

December 21 - Winter Solstice:

Daybreak: 10:03 - Sunrise: 11:22 - Noon: 13:26 - Sunset: 15:30 - Darkness: 16:49


2018

January 1:

Daybreak: 10:03 - Sunrise: 11:19 - Noon: 13:31 - Sunset: 15:44 - Darkness: 17:00


January 22:

Daybreak: 09:35 - Sunrise: 10:37 - Noon: 13:39 - Sunset: 16:43 - Darkness: 17:45


February 26:

Daybreak: 07:57 - Sunrise: 08:46 - Noon: 13:41 - Sunset: 18:37 - Darkness: 19:25


March 26:

Daybreak: 06:19 - Sunrise: 07:07 - Noon: 13:33 - Sunset: 20:01 - Darkness: 20:50


April 23:

Daybreak: 04:27 - Sunrise: 05:28 - Noon: 13:26 - Sunset: 21:26 - Darkness: 22:28


May 21:

Daybreak: **:** - Sunrise: 03:54 - Noon: 13:24 - Sunset: 22:57 - Darkness: **:**


June 21 - Summer Solstice:

Daybreak: **:** - Sunrise: 02:55 - Noon: 13:30 - Sunset: 24:04 - Darkness: **:**


July 23:

Daybreak: **:** - Sunrise: 04:05 - Noon: 13:34 - Sunset: 23:22 - Darkness: **:**


August 20:

Daybreak:04:33 - Sunrise: 05:34 - Noon: 13:31 - Sunset: 21:26 - Darkness: 22:26


September 24:

Daybreak: 06:28 - Sunrise: 07:16 - Noon: 13:20 - Sunset: 19:22 - Darkness: 20:09


Oktober 22:

Daybreak: 07:49 - Sunrise: 08:39 - Noon: 13:12 - Sunset: 17:44 - Darkness: 18:34


November 19:

Daybreak: 09:07 - Sunrise: 10:09 - Noon: 13:13 - Sunset: 16:17 - Darkness: 17:19


December 21 - Winter Solstice:

Daybreak: 10:03 - Sunrise: 11:21 - Noon: 13:26 - Sunset: 15:30 - Darkness: 16:49


* These numbers are different for other places in Iceland.

The above information is from Icelandic University Almanac (Almanak Háskóla Íslands) and can be seen here in more detail:
http://www.almanak.hi.is/solgang.html