"Brian Wakem" wrote in message ...

Personally I use actual days i.e. 00-24 as that is the only way that makes
any sense to me at all.

It's also the only easy way to use the automated daily min/max values that
most automatic weather stations (and especially their software) generate and
this includes the Vue. There are one or two exceptions to this, like the
Cumulus software AIUI, but in general they are exceptions and not the norm.

Those more steeped in the traditional manual ways of weather recording are
still very much attuned to the 09-09 station day because of the obvious
practical difficulties of taking readings in the dark or, necessarily for
non-professional observers, of being awake at midnight each night. And so
much of the UK archival data is presumably based on an 09 day.

Ultimately, the choice is yours - it will be your station and your data. But
accepting the 00-24 day and automatic measurements solves a lot of practical
issues.