Weather Binding - how to get rain amount for last day(hours)

Add-ons Bindings
1

Hi there.
I’m using Yahoo Weather binding, but in principle it doesn’t matter - for my irrigation I need to know if there was any rain for last day or couple of hours - I would like to know real value instead of forecast. But looking at https://github.com/openhab/openhab/wiki/Weather-Binding I’m no sure which binding and topic provides such value. Maybe it should not be even Yahoo, but perhaps Wunderground. Any help?

2

Wunderground is the only provider that the Weather binding is able to provide the Precipitation Today (note: this is the amount of precipitation that has fallen since midnight, it resets to zero at midnight).

However, that parameter is currently not working so I use the HTTP binding to get at it. I’m on 1.8.x, things might be different on 2.

#openhab.cfg

http:weather.url=http://api.wunderground.com/api//conditions/q/:weather.xml
http:weather.updateInterval=1800000

For example the URL (minus my API key) for Monument, CO would be:
http:weather.url=http://api.wunderground.com/api//conditions/q/CO/monument.xml:weather.xml

Make sure you set the updateInterval such that you don’t get your api key banned for too many requests.

Item

Number      Weather_Precip_Today "Precip Today [%.2f in.]" <rain> (gChart) { http="<[weather:300000:XSLT(wunderground_conditions_precip_today_in.xsl)]"}

wunderground_conditions_precip_today_in.xsl

Note: goes in the transform folder

<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
        <xsl:output indent="yes" method="xml" encoding="UTF-8" omit-xml-declaration="yes" />
        <xsl:template match="/">
                <xsl:value-of select="//current_observation/precip_today_in"/>
        </xsl:template>
</xsl:stylesheet>

You can bring up the XML in a browser and look around to see if there is a more appropriate value for your needs.

One thing to note, with my nearby stations there is quite a large delay between when the rain starts and this value is updated.

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