If a High develops over the Chatham Islands, what weather pattern is likely to affect Canterbury and Otago?

When a High pressure system develops over the Chatham Islands, it generally leads to fine and settled weather across much of the South Island, including regions like Canterbury and Otago. A High pressure system is characterized by descending air, which inhibits cloud formation and precipitation.

In this scenario, the correct choice indicates that fine weather is expected, meaning clear skies and little to no precipitation are likely. The presence of the High can lead to light winds and stable atmospheric conditions, allowing for pleasant weather. Furthermore, the positioning of the High affects how moisture-laden air masses are distributed across the region.

In contrast, options suggesting wet weather, plummeting temperatures, or stormy conditions would not typically occur with a High pressure system in the vicinity, as these conditions are more commonly associated with Low pressure systems. Thus, fine weather as a result of a High is the most accurate representation of the expected weather pattern in this case.