Sorry if this as been discussed before but after searching through the discussions I couldn't find one that matches my issue exactly. I noticed the month rainfall total for my station was off by 0.01". After some testing, I figured out this was due to the conversion of rainfall data from mm to inches. The data is stored as a float with 16 significant digits (i.e. 0.04 is stored as 0.0405511811023656) in the database. Thus, when using the sum tag like $month.rain.sum, it returns a float with two decimal place rounded up. So a raw monthly rainfall sum produces 0.3251968503937174 which becomes 0.33 inch using the $month.rain.sum. I noticed this was an issue when sending data to Wunderground in 2013 which requires data in US units.This has been fixed <https://groups.google.com/forum/#!searchin/weewx-user/US$20conversion$20rain|sort:relevance/weewx-user/h7entGBwgRk/WAdYgZldR8QJ>. I checked my data on Wunderground and it is reporting the correct amount of 0.32 inches so I am thinking a similar change needs to be made to the StdReport. I am running the latest version of WeeWx 3.6.2. Let me know if you need more info or I missed a fix for this. Thanks.
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