http://www.google.com/url?sa=t&source=web&ct=res&cd=2&url=http%3A%2F%2Fwww.campbellsci.com%2Fdocuments%2Ftechnical-papers%2Fsiting.pdf&ei=2MG5SuqmNtqOtgeZu-G3BA&usg=AFQjCNHXHJ6jdjHsybWcFFwc9RUTBlnZyQ&sig2=EFtli9mjLymtnmHqBdj_9Q
Weather Station Siting and Installation Tools (App. Note 4-S)
Temperature and Relative Humidity
The sensor should be housed in a ventilated radiation shield. The
EPA recommends the sensor be no closer than four times an
obstruction’s height, at least 30 m from large paved areas, and
located in an open level area that’s at least 9 m in diameter. The
open areas should be covered by short grass, or where grass does
not grow, the natural earth.
Avoid these:
• large industrial heat sources
• rooftops
• steep slopes
• sheltered hollows
• high vegetation
• shaded areas
• swamps
• areas where snow drifts occur
• low places holding standing water after rains
Standard measurement heights:
1.5 m ± 1.0 m (AASC)
1.25 to 2.0 m (WMO)
2.0 m temperature (EPA)
2.0 m and 10.0 m for temperature difference (EPA)
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