Calculate average for multiple ranges for multiple criteria

Hello,

I would like to calculate average values from multiple different ranges with varying number of sizes for multiple criteria. I have:


A B C D E
1 Day Time Hour Temperature Average Temp.
2 15.02.13 09:02:15 10 20,1 20,3
3 15.02.13 09:02:45 10 20,5
4 15.02.13 10:01:15 11 21,5
5 15.02.13 10:02:15 11 21,7
6 15.02.13 11:02:15 12 22
7 15.02.13 11:02:15 12 22,5
8 16.02.13 09:02:15 10 20,1
9 16.02.13 09:02:45 10 20,5
10 16.02.13 10:01:15 11 21,5
11 16.02.13 10:02:15 11 21,7
12 16.02.13 11:02:15 12 22
14 16.02.13 11:02:15 12 22,5
15 16.02.13 13:02:45 14 23,5

I want to get average temperature for a same day (in column A) and same hour (in column C) automatically calculated and written in the first row (in column E) for the corresponding day and hour. Example: 20,1 and 20,5 for day 15.02.2013 hour 10 -> average 20,3 in E2. Can anyone please help me?

Thank you!