Looking for a tag- Two sensors grouped into one

[weerman]

Hi all,

I'm looking for a tag which combines the values two temperature sensors into just one tag. 

E.g. you have two sensors, one is mounted on a north facing wall and one on a west facing wall. Lets say the sensor on the west facing wall reads 25°C and the one on the north face reads 23°C. So the average value of both sensors would be 24°C. That would be the value of the tag i'm after. 

Does such a tag already exist in weewx tags or do i have to create such a tag by myself?

Many Thanks 

Georg

[Karen K]

Something like that (not tested):

#set $avgtemp = ( $current.temp1 + $current.temp2 ) / 2

North-west average: $avgtemp