Due to the country's northern location, daylength in Latvia changes continually—and sometimes signficantly from week to week.  The following chart shows the time of sunrise and sunset, and the length of the day for selected days beginning August 1, 2000.  (Latvia does not observe Daylight Savings Time. Times are from the 2000/2001 School Year Teacher's Calendar.)
 
 

Date	Sunrise	Sunset	Day Length  (hr, min)	Change  (hr, min.)		Date	Sunrise	Sunset	Day Length  (hr, min)	Change  (hr, min)
Aug. 1	4:23	20:35	16h12m			Feb. 1	8:23	16:53	8h 30m	+1h 4m
Aug. 15	4:51	20:03	15h12m	-1h		Feb. 15	7:52	17:25	9h 33m	+1h 3m
Sept. 1	5:26	19:19	13h 53m	-1h 19m		Mar. 1	7:17	17:56	10h 39m	+1h 6m
Sept. 15	5:55	18:41	12h 46m	-1h 7m		Mar. 15	6:39	18:27	11h 48m	+1h 9m
Sept. 25  (equinox;  approx.)	6:15	18:14	11h 59m	-47m		Mar. 17  (equinox;  approx.)	6:34	18:31	11h 57m	+9m
Oct. 1	6:27	17:58	11h 31m	-28m		Apr. 1	5:53	19:03	13h 10m	+1h 13m
Oct. 15	6:57	17:21	10h 24m	-1h 7m		Apr. 15	5:16	19:33	14h 17m	+1h 7m
Nov. 1	7:34	16:39	9h 5m	-1h 19m		May 1	4:36	20:07	15h 31m	+1h 14m
Nov. 15	8:05	16:11	8h 6m	-59m		May 15	4:06	20:35	16h 29m	+58m
Dec. 1	8:37	15:48	7h 11m	-55m		June 1	3:39	21:05	17h 26m	+57m
Dec. 15	8:56	15:42	6h 46m	-25m		June 15	3:29	21:19	17h 50m	+24m
Dec. 23  (solstice)	9:01	15:44	6h 44m	-2m		June 22  (solstice)	3:29	21:22	17h 53m	+3m
Jan. 1	9:01	15:53	6h 52m	+8m		July 1	3:34	21:20	17h 46m	-7m
Jan. 15	8:50	16:16	7h 26m	+34m		July 15	3:52	21:06	17h 14m	-32m