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

Figure 1: Average rainfall rate (mm/day) from TRMM 0.25 degree analysis for months of February (upper) and September (lower) 2005. Contours at uneven of 0.5, 1, 2, 4, 6, 8, 10, 15, and 20 mm/day.