At which time will the year totals for rain be updated?

[WS Grave]

When it's raining, you can see the amount of rainfall directly.
This will also be added to the month total, but it takes quite a long time before the year total is changed.
Is there a specific time of day when the year totals are changed or should this also change immediately?

See attached image (last rain was at 8 am, but now, 7 hours later, the year total still not changed:

[admin]

every day processing this starts at 4:47