Basically a Stevenson screen arrangement then - note this doesn't report ground frost, should that be
of interest, but is a lot more consistent between locations when the sun is out. It might be interesting
to also record sunlight intensity in a location that's never shaded as that gives useful information about
insolation (not to be confused with insulation!)
You don't need more than one clock for a WSN, since you are getting every measurement in realtime,
which means WS nodes can be very simple and stateless. If you want confidentiality or authentication
though, things are more complicated and NTP makes sense for timestamping to prevent replay
attacks.