Thanks for the feedback,
The average was a little bit goofed up. Here's what I have now:
for d in data:
if d[0] <= tinit+60:
d = column_stack(d)
cnt=cnt+1
sum = sum+d
else:
avg = sum/cnt
if init==0:
newData = avg
init=1
else:
newData = append(newData,sum,axis=0)
tinit,cnt = d[0],0
return newData
it still seems awfully un-Python :o