The Wairarapa,
having a
similar latitude to
Madrid
in the Northern
Hemisphere, enjoys a
pleasant climate with long dry summers and cool clear winters. Maximum
and
minimum temperatures have in the past (records from 1969) reached 35.2
degrees
Celsius in the summer and –6.5 ˚C in the winter, although highs of 32˚C
and lows of –2˚C are more common.
New Zealand
is affected by long-term
weather
patterns caused by temperature changes in the major southern oceans.
These
patterns have been termed ‘El Niño’ and
‘La Niña’, and each last around five years
before switching
back to the other. We are currently entering a ‘Niño’
period, typified by the more extreme weathers of hot dry summers and
cold
clear winters.
There is also evidence to
suggest that another weather cycle exists –
the Pacific Decadal Oscillation – a twenty-year cycle that can heighten
or
subdue the effects of El Niño and La Niña weather patterns. We appear to be entering
a period
that will heighten the Niño effects.
The elevation of the upper
terrace of Totara Bank is around 100m above sea level.
At Totara Bank the average yearly rainfall
is 800mm (31 inches), half falling between the months of May and
August. Dry
periods are common in the summer months and relatively long spells
without
rain can be expected.
There are around 2100 hours
of sunshine per year in the
Gladstone
area, (a microclimate
in the Wairarapa).
The Tararua
mountain range that stretches
along the central part of the lower North Island intercept the
predominant northwesterly weather patterns
from the Tasman Sea, causing
high rainfall in the mountains and a rain shadow in the Wairarapa
plains. Snow rarely falls on the plains, but is common on the
mountains, where
it can stay above 600m for many weeks.
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