I have to be tedious, too, perhaps a little late, but it is for the first time that I hear a day (a date in calendar) begins in the morning, because some internet travellers wake up in the morning and they consider that unique moment the start of their day. Perhaps daylight begins in the morning, that is another thing. Maybe some people who work at night and sleep the day might want the day to begin at 7 PM.
Watching the weather table, it appears that until morning, is still yesterday, and that is not right. Simply look at any clock, calendar, smartphone, smartwatch in this world: after 00:00, is today. This can't be changed, and has nothing to do with people waking up and start surfing the internet.
There was also a mention about the sunrise image in the table being connected to the start of the day (morning). But if so, the sunset image, next to sunrise, is connected to...? I see no connection here.
Met.no, that seems one of the last free services to work flawless, starts the day at midnight, and this is normal. The same for any official daily weather web service that respects itself, like Google, Yahoo, AccuWeather, WeatherUnderground and so on.
Of course I have no right to ask for changes that would bring my understanding of normality, because this is a volunteer act that I truly appreciate (I also want to donate when I have a final form, the man who worked on this has to be rewarded for his master work). This script is the top for services it offers and is it the best one I found after months of research. But, for an accurate information of the public in the whole wide world, it needs a simple but complicated thing: to be perfect.
Thank you and sorry if I upset anyone, it's just a point of view.