That is exactly the issue; the OP wishes to generate a file that includes 
rain in mm and snow in cm with separate tags for each data value and 
corresponding unit. Presently I don’t believe that can be done with the 
existing tag system.

Gary

On Tuesday, 30 November 2021 at 22:03:44 UTC+10 [email protected] wrote:

> Yes, but then snow should be measured in mm.
>
> I can see an issue if you change units. That is, if you're doing something 
> like $day.snow.sum.cm, then you want the appropriate unit label. 
>
>
> On Mon, Nov 29, 2021 at 5:34 PM gjr80 <[email protected]> wrote:
>
>> Because the unit group being applied to snow, group_rain, is set to ‘mm’ 
>> (presumably so that rain appears in the correct/preferred default units) so 
>> $unit.label.snow will result in ‘mm’.
>>
>> Gary
>>
>> On Tuesday, 30 November 2021 at 11:12:06 UTC+10 [email protected] wrote:
>>
>>> That makes sense, but then why not just use $unit.label.snow?
>>>
>>> On Mon, Nov 29, 2021 at 4:57 PM gjr80 <[email protected]> wrote:
>>>
>>>> I think, reading between the lines, the issue may be that the OP wants 
>>>> to include something like snow in a WeeWX generated data file to be used 
>>>> by 
>>>> Highcharts, but using cm instead of mm as (seemingly) used for rain. I 
>>>> would expect that instead of passing something like '23 cm' in a single 
>>>> field Highcharts would want the value 23 in one field and 'cm' in another. 
>>>> The former can be obtained (for example) via $day.snow.cm.raw or 
>>>> $day.snow.cm.format(add_label=False) but there is no tag to get the 
>>>> unit label for 'cm' when your default unit for group_rain is mm. The 
>>>> only solution I can think of short of digging into the WeeWX internals is 
>>>> some in-line python code that parses the result of $day.snow.cm. Or 
>>>> hardcoding cm, but that is rather limiting.
>>>>
>>>> Gary
>>>> On Tuesday, 30 November 2021 at 10:20:02 UTC+10 [email protected] wrote:
>>>>
>>>>> Not understanding your question. The $unit tag is designed to retrieve 
>>>>> the reporting unit being used by an observation type. Why would you want 
>>>>> to 
>>>>> retrieve something different?
>>>>>
>>>>> If you want the value of a type in a different unit, you can do 
>>>>> something like:
>>>>>
>>>>> *$day.rain.sum.cm <http://day.rain.sum.cm>*
>>>>>
>>>>> This will give the rain since midnight in cm. Is this what you are 
>>>>> looking for?
>>>>>
>>>>> -tk
>>>>>
>>>>>
>>>>> On Mon, Nov 29, 2021 at 8:46 AM František Slimařík <[email protected]> 
>>>>> wrote:
>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> I have question regarding tag $unit. When I have for example tag 
>>>>>> $unit.label.rain it will show me " mm". Is there any way how to show 
>>>>>> different type of unit in case I want to show snow in my highchart graph 
>>>>>> and use this tag option? Like $unit.label.rain.cm?
>>>>>>
>>>>>> Thanks for answer.
>>>>>>
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