Hi all
We are running a WS 3600 with WD. We are having some problems with the rain guage and working through what may be some interference problems, (it rains between 8:00am and 5:00pm but the sky can be clear blue !!!). However, apart from this we have a random negative temperature occurring. It occurs randomly, maybe 1 or twice a day sometimes and them not for a whole week?!? It is usually of the order of -11 C occassionally as high as -15 when all the other temperatures are positive. We are taking the temperature every minute, we will ramp it back to every 5 minutes but it would be nice to know if it is a known problem or something anyone hhas a solution to 
Cheers
Mark