Figure 3.5: Annual rainfall (as a percentage of that between 1951 and 1980) for the southwest part of the South Island
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Note: This time series applies to the area shaded blue in Figure 3.4.
Text description of figure
This figure shows the year-to-year variability of annual rainfall, as a percentage of the average of 1951 to 1980 totals, for the southwest of the South Island for the period from 1940 to 2000. In the positive phase of the IPO (1978-1998) annual rainfall increased, while in the earlier negative phase of the IPO (1946-1977) rainfalls were generally lower than normal. Note: This time series applies to the southwest and west areas of the South Island, which is the area shaded blue in Figure 3.4.
