text: The absolute maximum temperature at Terrington stands at  recorded in August 2003, though in a more average year the warmest day will only reach , with 13.8 days in total attaining a temperature of  or more. Typically all these figures are marginally lower than those for the southern half of the Fens due to the presence of onshore sea breezes, and occasional haar (cold sea fog), especially in early summer and late spring. However, with a strong enough offshore breeze, the area can be notably warm. Terrington (along with Cambridge Botanical Gardens) achieved the national highest temperature of 2007,
  The absolute minimum at Terrington is , set in January 1979. A total of 41.6 nights will report an air frost at Terrington and 51.9 nights at Marham.
  Annual rainfall totals  at Marham, and  at Terrington, with 1 mm or more falling on 115 and 113 days, respectively. All averages refer to the 30-year observation period 1971–2000.
  Parks
  The largest of the town's several public parks are the Walks, a historic 17-hectare urban park in the centre of King's Lynn. They are the only town walk in Norfolk to survive from the 18th century. The Heritage Lottery Fund donated £4.3 million towards restoring them and adding modern amenities. They also include the Red Mount, a Grade II-listed 15th-century chapel. In 1998, the Walks were designated by English Heritage as a Grade II national historic park.