Masterton Monthly Climate AveragesNorth Island, showers clearing in the morning or afternoon then mainly fine. South Island, showers in the south retreating to the coast, otherwise mostly fine with morning frosts. North Island, cloudy periods in the north and west, with isolated showers about the Central Plateau ranges. Masterton nz weather in the east. South Island, fine and frosty in the north and masterton nz weather. Showers developing in the south and west, turning to rain in Fiordland later.
Masterton Weather - AccuWeather Forecast for Wellington New Zealand
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The amount of water vapour present in a cloud, and the strength of the rising air 'updraft' in that cloud, determines the intensity of rain it can produce. The depth, or thickness, of cloud determines how much water is available. These clouds also contain very strong updrafts, which means large drops of rain can be held up in the cloud until they grow so big that the rising air can no longer support them.
Prolonged heavy rain can also fall from very thick, slow-moving stratiform clouds known as nimbostratus. In New Zealand, the heaviest rain usually falls on the western side of the mountain ranges, where moisture-laden winds are forced upwards by the mountains, creating very deep clouds. But the process relies on more than water alone. Condensation nuclei are everywhere in the atmosphere. Water vapour wraps itself around them, which begins the process of raindrop growth.
As the drop gets bigger, it collides with more and more droplets and growth accelerates until the drop is heavy enough to fall. Forecasters use a plastic or metal open-topped cylinder called a rain gauge to capture rain. Rain gauges have standard dimensions so that measurements can be compared from place to place.
The amount of rain collected is measured over a certain timeframe — usually hourly or accumulated over 24 hours. Measurements can be made manually or electronically. In New Zealand we measure rain in millimetres. Weather Brief 20 April: A Nice but Cool Weekend in Store A nice weekend is in store for big parts of the country with an area of high pressure in control over the Tasman Sea. However, it will be quite chilly as a dominant southwesterly flow will move in over the South Island on Saturday and continue to the North Island on Sunday.
A weak front will bring scattered showers to the central and upper North Island on and off throughout the day on Saturday, however there will be plenty of dry spells as well. A pleasant day with mostly dry conditions is expected for the lower North Island with sunshine building in.
It will be quite breezy at times and temperatures will stay in the upper teens to low 20s. Another day of showers is likely for the West Coast, Southland, and lower Otago on Saturday with gusty conditions as well. The showers will continue throughout the day, but there will be breaks in the rain at times.
It will be chilly along the West Coast and lower South Island and snow is possible in the higher elevations. It looks to be a mostly dry day for the upper east coast of the South Island, however a few afternoon and evening showers may move into the central parts of Canterbury. A few showers may linger around the North Island in the early morning hours but they will quickly move to the north and east.
Dry conditions are expected for the entire country for the rest of the day with plenty of sunshine as well, especially for the east coast of both islands. However, temperatures will stay below normal for this time of year for the entire country with a dominant southwesterly flow in control. Click the map to view the animated forecast.
NIWAWeather keys The colour gradient you see behind your town or city forecast depicts the amount of cloud cover expected during daylight hours - ranging from clear blue to dark grey overcast. If rain or snow is expected, raindrop or snowflake symbols will also appear in the background. The further down the screen the symbols appear, the heavier we expect the rain or snow to be. How does rain come out of clouds? How is rain measured? Please select a location: You are seeing this message as your browser does not support this and other required features.
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