This new behaviour is caused by this WeeWX 4.5.1 commit:

https://github.com/weewx/weewx/commit/a6098878562e4a35345051c45ee6aadf31edbdce

            for stamp in weeutil.weeutil.intervalgen(startstamp, stopstamp, 
aggregate_interval):
                # Get the aggregate as a ValueTuple
                agg_vt = get_aggregate(obs_type, stamp, do_aggregate, 
db_manager)
*                if agg_vt[0] is None:*
*                    continue*
                if unit:
                    # It's OK if the unit is unknown (=None).
                    if agg_vt[1] is not None and (unit != agg_vt[1] or 
unit_group != agg_vt[2]):

Comment out the text marked as bold in xtypes.py to restore previous 
behaviour or wait for Pat (or someone else) to create a fix for Belchertown 
skin.
Op maandag 3 mei 2021 om 19:48:20 UTC+2 schreef James Taylor:

> Not sure.   Under weewx 4.4.0 my Temperature chart were as follows under 
> Belchertown
> [image: IMG_2780.png]
>
> Under weewx 4.5.1 it was displaying as the following
>
> [image: IMG_2781.png]
>
> I made no changes other than upgrade to 4.5.1.
>
> # Global Chart Defaults
> # These are fallback options that charts will use if an option is not 
> defined.
> aggregate_type = None
> time_length = 90000 # Last 25 hours
> type = line
> colors = "#7cb5ec, #b2df8a, #f7a35c, #8c6bb1, #dd3497, #e4d354, #268bd2, 
> #f45b5b, #6a3d9a, #33a02c"
> tooltip_date_format = "LLL"
>
> [day]
>     # Chart Timespan Defaults
>     title = "Today since Midnight"
>     show_button = true
>     button_text = "Day"
>     time_length = today
>     tooltip_date_format = "LLL"
>
>     aggregate_type = max
>     aggregate_interval = 300
>     gapsize = 300000 # This should be your archive_interval from 
> weewx.conf multiplied by 1000 to get milliseconds. Standard is 5 minutes
>
>     [[chart1]]
>         title = Temperature
>         start_at_midnight = true
>         [[[outTemp]]]
>             zIndex = 1
>             name = Temperature
>         [[[windchill]]]
>         [[[heatindex]]]
>             color = "#f7a35c"
>         [[[dewpoint]]]
>             color = purple
>
> Obviously 4.4.0 came out this year so I'm wondering if something has been 
> changed in Tom's code.
>
> James
>
> On Friday, April 9, 2021 at 7:08:29 AM UTC+1 [email protected] wrote:
>
>> should this still work with weewx 4.5.1 ?
>>
>> i updated and my full day charts are gone
>>
>> Manfred Maier schrieb am Montag, 15. Juni 2020 um 11:12:27 UTC+2:
>>
>>> Thanks, Gary, for this comprehensive explanation.
>>>
>>> Based on what you wrote I was now able to plot an entire day.
>>>
>>> [image: Bildschirmfoto 2020-06-15 um 11.07.53.png]
>>>
>>> The trick is quite simple: I just had to define an aggregation for the 
>>> daily charts. I.e. adding the following two lines to the graphs.conf:
>>>
>>>     aggregate_type = max
>>>
>>>     aggregate_interval = 300
>>>
>>>
>>>
>>>

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