In your example that is a correct rounding when the print format is defined 
with 2 digits precision in the template - change the precision to %.3 (or 
whatever is the correct format) in the template if you want three digits 
..........

if you want to truncate without rounding then I think you will need to add 
some python code to the templates ......
http://stackoverflow.com/questions/783897/truncating-floats-in-python



On Sunday, 18 December 2016 08:46:00 UTC+2, Josh Smith wrote:

> It's a Lacrosse WS-2316 and like most stations takes observations using 
> the metric system. A conversion is done somewhere, I believe it's in WeeWx 
> but it could be the Lacrosse software. Either way, the problem isn't where 
> the data is converted, the conversion itself is correct. It's the 
> calculations with the converted data that is causing a minor issue. Using 
> the $month.rain.sum tag causes the 16 significant digit sum to round up. So 
> a monthly sum of 0.3251968503937174 inches is shown as 0.33 inches instead 
> of 0.32 inches. This is pretty trivial overall. 
>
> On Saturday, December 17, 2016 at 11:25:52 PM UTC-7, gjr80 wrote:
>>
>> Hi,
>>
>> I am a little puzzled here. All of your figures appear to be quoted in 
>> inches, so I am assuming your database is using US customary units (ie 
>> inches for rainfall). So wondering where the mm come into it? Also, what 
>> type of station are you using? Davis?
>>
>> Gary
>>
>>

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