[hvalentim]

Nice pictures. A pro installation!

Thanks. Still, there is room for improvement with a second TX.

Wind sensors are placed per WMO recommendations:

"standard height of 10 m above open terrain is specified for the exposure of wind instruments."

But the rain-gauge may be too exposed:

"Ground-level gauges are used as reference gauges for liquid precipitation measurement. Because of the absence of wind-induced error, they generally show more precipitation than any elevated gauge (WMO, 1984). The gauge is placed in a pit with the gauge rim at ground level..."

As well as the temp/hum sensor:

"For general meteorological work, the observed air temperature should be representative of the free air conditions surrounding the station over as large an area as possible, at a height of between 1.2 and 2.0 m above ground level. The height above ground level is specified because large vertical temperature gradients may exist in the lowest layers of the atmosphere. The best site for the measurements is, therefore, over level ground, freely exposed to sunshine and wind and not shielded by, or close to, trees, buildings and other obstructions. Sites on steep slopes or in hollows are subject to exceptional conditions and should be avoided. In towns and cities, local peculiarities are expected to be more marked than in rural districts. Temperature observations on the top of buildings are of doubtful significance and use because of the variable vertical temperature gradient and the effect of the building itself on the temperature distribution."

Of course the ideal must meet the feasible somewhere and if one did take WMO recommendations to the letter, keeping a weather station would become a real estate project (see attached schema).

Also, the requirements to qualify to be Class 1 temp/hum installation are:
"Class 1
(a) Flat, horizontal land, surrounded by an open space, slope less than ⅓ (19°);
(b) Ground covered with natural and low vegetation (< 10 cm) representative of the region;
© Measurement point situated:
(i) At more than 100 m from heat sources or reflective surfaces (buildings, concrete surfaces, car parks, etc.);
(ii) At more than 100 m from an expanse of water (unless significant of the region);
(iii) Away from all projected shade when the sun is higher than 5°."

   
I find particularly problematic the idea that one should keep temp/hum instruments over grass. I do have some grass around but how I am (or anyone) supposed to keep it without watering at least in Summer?