The Battle of Grand Gulf was fought on April 29, 1863, during th: The average total annual sunshine in the United Kingdom is 1339.7 hours, which is just under 30% of the maximum possible.[146] The hours of sunshine vary from 1200 to about 1580 hours per year, and since 1996 the UK has been and still is receiving above the 1981 to 2010 average hours of sunshine.[147]