Current climate: April 2019

Overall, April 2019 was characterised by higher pressure than normal over the Tasman Sea and New Zealand.  This resulted in more northerly winds than usual overall, however the prevailing area of high pressure over the Tasman Sea enabled several outbreaks of southerly airflow over New Zealand during the month. The lack of a consistent airflow anomaly during April resulted in a variety of rainfall and temperature patterns observed throughout the country.

Temperature

Inland parts of Southland, Otago and Canterbury experienced below average (-0.51°C to -1.20°C of average) temperatures. In contrast, areas along the west coast of the South Island experienced above average (+0.51 to +1.20°C of average) temperatures. Temperatures were near average (-0.50 to +0.50°C of average) for the majority of the North Island.

Rainfall

Above normal (120% to 149% of normal) or well above normal (>149% of normal) rainfall for much of inland Otago, southern Westland, Canterbury, Marlborough Wellington, Wairarapa and Taranaki. Below normal (50% to 79% of normal) or well below normal (<50% of normal) rainfall for eastern Southland, north Otago, Nelson and Tasman, Hawke’s Bay, eastern Waikato, western Bay of Plenty and Northland.

Soil Moisture

By the end of April, soils were drier than normal for northern and central parts of the North Island. Soils were also drier than normal for southern parts of Marlborough, north Otago and southern Southland. Soil moisture levels were above normal for northern Fiordland, western Otago, eastern Marlborough, Wellington and northern Taranaki.

Departure from average air temperature for April 2019.
End of month water balance in the pasture root zone for an average soil type where the available water capacity is taken to be 150 mm.
Percentage of normal rainfall for April 2019