The Dairy Season in New Zealand Kicks Off With A Reasonable Seasonal Weather Outlook
Even with El Nino talk intensifying the weather looks good for the start of the dairy season
Hamilton, New Zealand, 3 August 2018. Dairy cows around the country tend to freshen in the month of August and grass
growth becomes important as production ramps up with warmer weather. It was only last December when large parts of the
country were shocked by the dry and exceptionally warm weather. This year, in contrast, looks to be headed in a slightly
different direction. The latest and updated every ten-day seasonal rainfall and temperature outlook is for benign
conditions through October.
The slightly drier monthly forecasts for Northland through the Waikato and Bay of Plenty, Taranaki and the Manawatu and
down the west coast of the South Island and into Southland might be welcomed. In most of these areas the forecast for
August is for between 10 and 25 percent less rainfall than normal. Meanwhile Southland and most of the eastern half of
the South Island and parts of coastal Taranaki and from Wellington up the east coast to East Cape may expect nearly
normal (plus or minus 10 percent) rainfall. The mean monthly temperature for August is forecast to be between 0.25 and
roughly 0.75 degrees C above normal which is not excessive and will certainly spur grass growth. Some parts of eastern
Otago are expected to be only slightly cooler than normal for the month of August.
For the months of September and October the downscaled CFSv2 forecast for the country looks changeable. The current
September outlook is for drier conditions to persist in the Waikato through the South Island and with near normal
rainfall in Northland, Coromandel and Bay of Plenty and through Hawkes Bay and the Wairarapa. October currently looks to
be near normal for much of the North Island and down the east coast of the South Island with slightly drier than normal
conditions prevailing through parts of Taranaki and the Manawatu. Temperatures in September are looking likely to be
slightly cooler in Northland and the east coast of the North Island and slightly warmer from Auckland south to Taranaki
and through to Wellington. Much of the South Island looks likely to be moderately warmer than normal with some areas
over 1.0 degrees C above the average for the months of September and October.
Regionally, much is being said about the exceptional drought occurring in Australia. The team at ExtendWeather has
developed new SPI, SPEI and SMRP (soil moisture ranking percentile) outlooks for the world. The eastern part of
Australia is showing signs of a continued exceptionally low soil moisture through December for much of interior Southern
Queensland, New South Wales, northern Victoria, South Australia and Tasmania. This is a reasonably large area of the
productive South East of the country and this looks to like it might greatly impact wheat and other rainfed production
and pasture growth. Conversely, there are no signs of either drought or moderate to severe soil moisture stress in the
models for New Zealand through December. We will continue to monitor the situation closely and release another update
toward the middle of August.
ExtendWeather is part of a larger weather, sub seasonal/seasonal and climate risk forecasting, modeling and consulting
group at CLIMsystems Ltd. Our team has developed innovative products and services for application around the world. If
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For a three-month preview of the rainfall and temperature outlook for New Zealand: https://www.youtube.com/watch?v=cHaYKRt4mug=youtu.be
If you would like more information on this topic see the website www.extendweather.com
or call Soumik on 022 132 0438.
New global soil moisture outlook with August preview with red being dry and blue being wet: