Ah, darned, you multi-posted in .misc. Pl refrain from doing this
Below's my response to you over the
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Assume your reference table as posted is in A1:E7

Assume the triple inputs in G2:I2 a October, Sunny, 2
In J2, normal ENTER:
=INDEX(C2:E7,MATCH(1,INDEX((A2:A7=G2)*(B2:B7=H2),) ,0),MATCH(I2,C1:E1,0))
will return the reading 6.1

Changing the triple inputs to: July, Sunny, 3
will yield in J2: 15.2

Adapt the ranges to suit
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Max
Singapore
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xdemechanik
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