196
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,
If
~
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<:::::=>
-38S ---'r--------- -----I
,
.
120W
0.0
1. 5
3.0
4.5
,
,
... -~ - -- - -
6.0
7.5
Standard deviation of
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,
,
I
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_ .. --..,;
.
,
,
OBSERVATIONS
"
9.0 le.S 12.0 13.5 ~5.0 16.5 '8.0 19.5 21.0
ea level aIr pressure
Janua r y
fh Pa]