On 1 July 2025, NIWA merged with GNS Science to become Earth Sciences New Zealand.

Average no. TCs passing within 5deg of the main island groups November to April 2012 - ICU 37

Average number of TCs passing within 5° of the main island groups between November - April. Activity level (and associated risk) are indicative of how many storms might be expected for any given island group for the current season.