Outlook and outcome – May 2005 to July 2005

Rainfall was higher than predicted in parts of the north and east of the North Island and less than predicted for much of the South Island.

Air temperatures were above average as predicted in most places, apart from near normal temperatures in parts of the east of both islands and south of the South Island.

Stream flows were normal to above normal in the east of the North Island, lower than normal in the north of the South Island, and below normal to normal elsewhere.


The outcome maps shown here give the tercile rankings of the rainfall totals and mean temperatures that eventuated for these months. Terciles were obtained by dividing ranked May to July data from the past 30 years into three groups of equal frequency (lower, middle and upper one-third values) and assigning the data for the present year to the appropriate group. (Click to enlarge)

As an approximate guide, middle tercile rainfalls often range from 80 to 115% of the historical average. Middle tercile air temperatures typically occur in the range of the average plus or minus 0.5°C.