Creating a clustering model using simple k-means algorithm

I wish to create the above described model using weka BUT I am having 
difficulty in understanding the following…

My input is a time series - 5 consecutive hourly prices held in an excel 
worksheet
first row is at time t
second row is at time t+1 etc.

I wish k to be 25 - i.e. 25 clusters

But I want the clustering to be based on the graph/plot of the 5 prices 
not the actual prices themselves as per the following example

example1

Could somebody please show me how to achieve the clustering I want

Thank you

Bob M

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