Thanks for the detailed response Gary, I should have said I am still on 4.10.2, 
are the base temperature stanzas available in this version? I like the idea of 
putting it in the Weewx config rather than the skin.

Rory

> On 30 Sep 2024, at 10:02, gjr80 <[email protected]> wrote:
> 
> The simple part of the answer - you want a [Units] [[DegreeDays]] stanza in 
> your skin config file. It's covered in the v5.1 documentation here 
> <http://weewx.com/docs/5.1/reference/skin-options/units/#degreedays>.
> 
> The challenge you will now face is where to put your setting(s). The answer 
> is it depends. You could create a [Units] [[DegreeDays]] stanza in your skin 
> config file and those settings will apply to each report in your skin. You 
> could alter your [StdReport] [[Defaults]] [[[Units]]] stanza in weewx.conf by 
> adding your [[[[DegreeDays]]]] there, this would change the default settings 
> for all reports (skins) but has the advantage of not needing any changes to 
> any skin config files. You could also place a [[[Units]]] [[[[DegreeDays]]]] 
> stanza under any of your reports (skins) listed under [StdReport] in 
> weewx.conf. Any such settings would apply to only the report (skin) under 
> which the settings are included.
> 
> Note the different number of [] on each stanza heading depending on where it 
> is used. The documentation shows the correct number of [] for the skin config 
> file, a different number of [] pairs are used in weewx.conf due to the 
> stanzas being pushed further down the config hierarchy.
> 
> Really is a personal preference where to put skin settings. I prefer to keep 
> my customisations in weewx.conf, it means I can freely upgrade/update skins 
> and my customisations (well settings) are in one place only, but it does make 
> my weewx.conf larger. Horses for courses.
> 
> Gary
> On Monday 30 September 2024 at 18:31:13 UTC+10 [email protected] wrote:
>> Hi, quick question about the heating degree days algorithm used in the NOAA 
>> text reports. I assume this uses the US base temperature of 18.3°C (65°F)? 
>> In the UK we use 15.5°C (59.9°F), is there any way of changing it to this?
>> 
>> Thanks,
>> 
>> Rory
> 
> 
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