Just throwing this out there. Looking at a project like InfluxDB is really interesting, but in terms of logging temperature data, both internally and externally, consider the fact that Weewx already does this and you can archive it. You can even act on the data with @Cobra 's very cool Weather Switch. I get the idea of using the indoor temperature sensors we already have in our motion sensors, thermostat, remote sensors, etc., but is the fluctuations between rooms inside our homes different enough, or the accuracy between these temperature sensors accurate enough to make that even viable?
Just food for thought. InfluxDB looks cool and it's a worthy idea to move it over the HE, but those of us that are not already weather geeks, but want to track environment variable might find that they really could enjoy getting the equipment, which typically includes or cost very little extra to get indoor sensors to chart those parameters.
