If it's any help I had a look at your website and noticed if you hover over 
your day graphs there are values reported - but only every 30mins. This 
doesn't tie in with a gapsize = 300 which equates to an archive interval of 
5mins. As it says in the graphs.conf gapsize should be the same as the 
archive_interval in weewx.conf. Maybe something to investigate?
Paul

On Wednesday, 9 February 2022 at 19:24:07 UTC gjr80 wrote:

> I suspect you have a case of corrupt station memory. This manifests itself 
> as a Davis station that continues to emit loop but not archive data. In 
> your case you clearly still have loop data being received as your dashboard 
> updates with real data every couple of seconds. The lack of recent archive 
> records means that your day plots may be blank/partially blank due to the 
> lack of recent archive record data, longer historical plots still show 
> correctly up until the date-time the corrupt station memory kicked in. The 
> diagnosis can be confirmed by looking at the log, there will be no errors 
> but you will notice there are no archive records being saved. If you have 
> debug=1 you will also be able to tell by the drivers interaction with your 
> station.
>
> I suggest you work through the steps under Corrupt station memory 
> <https://github.com/weewx/weewx/wiki/Troubleshooting-the-Davis-Vantage-station#corrupt-station-memory>
>  
> in the Troubleshooting Davis stations 
> <https://github.com/weewx/weewx/wiki/Troubleshooting-the-Davis-Vantage-station>
>  
> wiki article.
>
> Gary
>
> On Wednesday, 9 February 2022 at 22:49:16 UTC+10 andyhud...@googlemail.com 
> wrote:
>
>> Afternoon - I cant work out why for the life of me i have no lines on 
>> some of my day graphs:
>>
>> http://www.finchamweather.co.uk/graphs/?graph=all
>>
>> A sub section of my graphs.conf for day is below - any thoughts would be 
>> really welcome..
>>
>> Andy
>>
>> [day]
>>
>>     # Chart Timespan Defaults
>>
>>     title = "Today"
>>
>>     show_button = true
>>
>>     button_text = "Day"
>>
>>     time_length = today
>>
>>     tooltip_date_format = "LLL"
>>
>>     gapsize = 300 # This should be your archive_interval from weewx.conf
>>
>>
>>     [[chart1]]
>>
>>         title = Temperature
>>
>>         [[[outTemp]]]
>>
>>             zIndex = 1
>>
>>             name = Temperature
>>
>>         [[[windchill]]]
>>
>>         [[[heatindex]]]
>>
>>             color = "#f7a35c"
>>
>>         [[[dewpoint]]]
>>
>>             color = purple
>>
>>
>>     [[chart2]]
>>
>>         # The combined Wind Chart works best in this configuration
>>
>>         title = Wind Speed and Direction
>>
>>         yAxis_min = 0
>>
>>         [[[windDir]]]
>>
>>             zIndex = 1
>>
>>             yAxis = 1
>>
>>             yAxis_max = 360
>>
>>             lineWidth = 1
>>
>>             [[[[marker]]]]
>>
>>                 enabled = true
>>
>>             [[[[states]]]]
>>
>>                 [[[[[hover]]]]]
>>
>>                         lineWidthPlus = 0
>>
>>         [[[windGust]]]
>>
>>         [[[windSpeed]]]
>>
>>             zIndex = 2
>>
>

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