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[ferret_users] calculation of monthly means from 5-day means



Dear ferret users,

I have a dataset of 5-day means. The corresponding dates on
a standard calender are given for the third day of the 5-day interval.
As an example I show you here a subset of the data:

yes? list/i=1/j=1/k=1/l=1:20 temp

03-JAN-1958 12 / 1: 19.04
08-JAN-1958 12 / 2: 20.35
13-JAN-1958 12 / 3: 21.18
18-JAN-1958 12 / 4: 21.57
23-JAN-1958 12 / 5: 21.53
28-JAN-1958 12 / 6: 21.75
02-FEB-1958 12 / 7: 21.94
07-FEB-1958 12 / 8: 22.03
12-FEB-1958 12 / 9: 22.39
17-FEB-1958 12 / 10: 22.48
22-FEB-1958 12 / 11: 22.43
27-FEB-1958 12 / 12: 22.63
04-MAR-1958 12 / 13: 22.92
09-MAR-1958 12 / 14: 23.00
14-MAR-1958 12 / 15: 22.98
19-MAR-1958 12 / 16: 22.99
24-MAR-1958 12 / 17: 23.01
29-MAR-1958 12 / 18: 23.08
03-APR-1958 12 / 19: 23.10
08-APR-1958 12 / 20: 23.15

Does anybody know how to calculate from this the corresponding monthly
means? Thus, how do I obtain the monthly means for Jan 1958, Feb 1958, etc.?
Note that the 5-day means are usually not aligned with the edges of the
months, so the 5-day means should not all have the same weight in the
monthly averaging.

I'm looking forward to a solution for this problem!

With best regards,

Wim-Paul Breugem

--
Wim-Paul Breugem KNMI, Oceanographic Research Dep.
P.O. Box 201, 3730 AE De Bilt
The Netherlands
tel./fax: +31-30-2206700/2202570
homepage: http://www.knmi.nl/~breugem
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