On Monday, 25 October 2021 at 22:12:16 UTC+10 [email protected] wrote:

> Yes, I found that I had to wait 24 hours. 
>
If a plot includes an aggregate (for example, max or min or average over 
some interval known as the aggregate interval) then the plot is generated 
every ‘aggregate interval’. So if your plot is displaying a one hour 
average the plot is generated every one hour, if it’s displaying a three 
hour average it is generated every three hours. If there is no aggregate 
involved the plot is generated every report cycle. The year plots (by 
default) use a one day (or 24 hour) aggregate interval so are generated 
every 24 hours. You can of course change the aggregate interval used in the 
plot to something much less, but this will increase (among other things) 
the time taken to generate the plot (more correctly it increases the time 
taken to obtain the data from the database).
 

> But if I understand you correctly, I have to start the import again? 
>
No. I never said anything about re-importing data. Once the data is 
imported it is in the database and running reports and generating plots 
only reads the data from the database; it does not alter it. So 
re-importing achieves nothing. What I said is that the default settings 
used in the year plots will give you a uv plot that appears to have low 
values. This is because the default year plots mostly display the average 
daily value (some do not, eg rain). So for an observation like uv that 
typically peaks around midday and is zero at night the daily average is 
almost always substantially less than the daily maximum.

What I did say was that you can force WeeWX to regenerate plots on the next 
report cycle by deleting the previously generated plots on your WeeWX 
machine. This saves you having to wait for the aggregate interval to pass 
(saving you having wait 24 hours to pass for a year plot to regenerate).
 
Gary

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