Ray wrote:
Hi,

I normally automatically reset all my data including Rainfall at Midnight on
my Davis Weather Monitor II. Is there a set time this should be done? It
seems logical to do it by the day but maybe standards specify a different
time?

Ray

The climatological convention is that the "rain-day" is 09 GMT
to 09 GMT the next day. This also applies to max and min temperatures,
though many people, myself included, use an 09-21 period for max's and
21-09 for min's, but keeping the 09-09 period for rain. I'd say
resetting everything at midnight is not the best thing to do.

Tudor Hughes, Warlingham, Surrey. (COL station 54025).