This seems a bit strange to me as everything else and 'normal??' practise is to display data at the station time - i.e. when it happened.The times on the graphs are shown in your local time zone.
Is there a particular reason for this?
Can it be changed to just use the station times - it does not seem to make a lot of sense to me for someone in a different time zone to looking at values for say mad afternoon (highest temps but have then saying they are happening at say late evening or some other time like 3am in the morning if they are on the other side of the world (we have ex-pats in the UK and the USA looking at our site in New Zealand).