"Freddie" wrote in message
.net...
I record meteorological data using a 0900-0900 day. If you record a minimum
temperature of, say, 3.5C at 03:30 on 15 January, to which date is that
temperature attributed? Is it the 14th (the date on which the recording
period started) or the 15th (the date on which the temperature was actually
recorded)?

--
Freddie
Bayston Hill
Shropshire
102m AMSL
http://www.hosiene.co.uk/weather/
https://twitter.com/#!/BaystonHillWx for hourly reports

For stations recording data for climatological purposes, readings are made
at 0900z daily.
Minimum temperatures and grass min read at 09z are attributed to the day
that they are read. Maximum temps and rainfall (amount and duration) are
attributed to the previous day (thrown back). Days of thunder, snow or hail
are attributed to the day on which they occur, period 00-24. Days with fog,
snow lying, for climatological stations, are recorded if the conditions are
met at 0900 z. Earth temperatures are read at 0900z.

--
Bernard Burton

Wokingham Berkshire.

Weather data and satellite images at:
http://www.woksat.info/wwp.html