Tuesday, April 10, 2012


cc: m.hulme@uea
date: Tue, 31 Oct 2000 14:14:08 +0000
from: Tim Mitchell <t.mitchellatXYZxyz.ac.uk>
subject: Re: quick questions
to: Sari Kovats <Sari.KovatsatXYZxyztm.ac.uk>


>Is that the mean of from 0100 to midnight or do we do something else fancy?


You can define a day in whatever way you want! Usually that means 24h (!),
but the start and finish moments may be done according to Greenwich Mean
Time, local time, or whatever. The best way would be to match the data that
you have for other variables.

The everyday definition of a "day" starts the moment the clock strikes
midnight, in which case, 00:00 would be your first measurement, and 23:00
your last.

I am assuming that the data that you averaging is already a mean itself. An
obvious example is that you cannot average the max wind speed in an hour
over a 24h period to obtain the max wind speed in a day.


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Tim Mitchell

post: CRU, UEA, Norwich, NR4 7TJ, UK
email: t.mitchellatXYZxyz.ac.uk
web: http://www.uea.ac.uk/~f709762
phone: +44 (0)1603 593161 (direct)
fax: +44 (0)1603 507784 (office)


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