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[ferret_users] calculation of monthly means from 5-day means
- To: ferret_users@xxxxxxxx
- Subject: [ferret_users] calculation of monthly means from 5-day means
- From: Wim-Paul Breugem <breugem@xxxxxxx>
- Date: Fri, 22 Dec 2006 16:21:28 +0100
- Importance: normal
- Sender: owner-ferret_users@xxxxxxxxxxxxx
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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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