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120°E
140°E
160°E
180°
NORTH-EAST TRADES
160°W
140°W
20°N
(A) January
Hawaiian Is
20°N
Mariana Is
> 100 mm
Marshall Is
RT ROPIC A
Kiribati
Phoenix Is
NORTH-WESTERLY MONSOON
NEW
GUINEA
Tuvalu
Soloman Is
DIVERGENT
EASTERLIES
Northern
Cook Is
Samoa
T
UGH
SO
Vanualu
HEAT
LOW
Fiji
20°S
20°S
New
Caledonia
Austral Is
Tonga
Southern
Cook Is
SOUTH-EAST TRADES
AUSTRALIA
H
H
H
NEW
ZEALAND
40°S
40°S
TRAVELLING ANTICYCLONES AND TROUGHS
H
DISTURBED
WESTERLIES
L
L
120°E
140°E
160°E
180°
160°W
140°W
120°E
140°E
160°E
180°
160°W
140°W
20°N
(B) July
Hawaiian Is
20°N
NORTH-EAST TRADES
Mariana Is
> 50 mm
ONE
Marshall Is
Kiribati
Phoenix Is
NEW
GUINEA
DIVERGENT
EASTERLIES
Soloman Is
Tuvalu
Northern
Cook Is
SOUTH-EAST TRADES
Samoa
Vanualu
Society Is
Fiji
20°S
20°S
Austral Is
Tonga
Southern
Cook Is
AUSTRALIA
New
Caledonia
H
H
H
TRAVELLING ANTICYCLONES AND TROUGHS
40°S
40°S
H
NEW
ZEALAND
DISTURBED
WESTERLIES
L
L
L
120°E
140°E
160°E
180°
160°W
140°W
Figure 10.33 Main climatological features of Australasia and the southwest Pacific. Areas with >100mm
(January) and >50mm (July) mean monthly precipitation for Australia are also shown.
Source: After Steiner, from Salinger et al. (1995). From International Journal of Climatology, copyright © John Wiley & Sons Ltd.
Reproduced with permission.
have much lower amounts, with less than
500mm in some parts. North Island has a
winter precipitation maximum, but South Island,
under the influence of depressions in the
southern westerlies, has a more variable seasonal
maximum.
D
HIGH LATITUDES
1 The southern westerlies
The strong zonal airflow in the belt of the southern
westerlies, which is apparent only on mean
 
 
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