Return max value from one column from similar values in another

Hi folks. I've got a heap of temperature data to analyse and am looking for an easy way to extract a maximum internal temperature from a group of readings with the same external temperature. E.g. When the external temperature is 25.0 there are say 20 different internal temperature values that correspond with the different dates and times that this external temperature occurs. I'm looking for a formula I can use in a separate table with the external temperatures in a header column that will refer to the header column and extract the data from the original table. Any help appreciated! E.g. below...
Internal (°C)
Loc 4-Ambient
Index
Date
TimeValue
Time
External (°C)
22.7
1.70
465
11/10/12
0.33
8:00:00 am
21
22.7
0.90
466
11/10/12
0.35
8:30:00 am
21.8
24.5
2.10
417
11/9/12
0.33
8:00:00 am
22.4
23.4
1.00
513
11/11/12
0.33
8:00:00 am
22.4
22.9
0.20
467
11/10/12
0.38
9:00:00 am
22.7
25.8
2.90
370
11/8/12
0.35
8:30:00 am
22.9
25.7
2.80
371
11/8/12
0.38
9:00:00 am
22.9
25.7
2.80
372
11/8/12
0.40
9:30:00 am
22.9
25.6
2.70
373
11/8/12
0.42
10:00:00 am
22.9
24.5
1.60
418
11/9/12
0.35
8:30:00 am
22.9
25.6
2.50
369
11/8/12
0.33
8:00:00 am
23.1
max temp
21.0
21.1
21.2
21.3
21.4
21.5

Hi Barry,
thanks for the response. Sorry, my example was not exactly clear. I'll take out the superfluous data and try and clarify my problem further. Based on the table below, I have sorted the data based on ascending external temperature (At these low external temperatures there are not so many data points, but when we get into the late 20s and 30s there can be hundreds of corresponding points). What I want to create is a separate table that I can graph, with the X axis showing the external temperature and the Y axis showing the maximum internal temperature that corresponds with each 0.1 degree increment of the external temperature.
external
internal
16.5
26.7
16.5
26.4
17
26.6
17.1
26.8
17.2
26.9
17.3
27.3
17.3
26.4
17.5
26.7
17.6
28.1
17.7
27.4
17.8
26.7
17.9
27.4
18
28.1
18
27.4
18.1
27
18.1
26.9
18.1
26.5
18.1
28
18.2
28.1
18.2
27.2
18.3
28.1
18.4
27.5
18.4
27.3
So my second table would just be two columns (I had 3 in the first example because I am doing a before and after painting the roof white comparison but I'm simplifying now) with my external temperature scale in column A in 0.1 degree increments. I am looking for a formula for column B that will give me the maximum internal temperature from my range of temperatures in the first table.
18.0
18.1
18.2
18.3
18.4
18.5
18.6
18.7
etcetera. The max for 18.1, for example, would turn out 28 based on the 4 corresponding data points in the first table.
Ideally I would like a formula using the MAX equation because I'm hoping that I can do a similar table for getting the average internal temperature for each of the external temperature increments too, but I didn't want to overcomplicate matters.
Cheers,
Neewok

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Yeeeeeeesh!!! : (
Message was edited by:
bpropes20

Return max value from one column from similar values in another

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