Davis Instruments DWW6357 User Manual

Choosing a Location for the ISS

9

• Place the ISS away from sources of heat such as chimneys, heaters, air conditioners 

and exhaust vents.

• Place the ISS at least 100' (30 m) away from any asphalt or concrete roadway that 

readily absorbs and radiates heat fromthe sun. Avoid installations near fences or 
sides of buildings that receive a lot of sun during the day.

• Ideally, mount the ISS so that it is between 5' (1.5 m) and 7’ (2.1 m) above the 

ground in the middle of a gently sloping or flat, regularly mowed grassy or natu-
rally landscaped area that drains well when it rains. You can also mount the ISS on 
the roof, between 5' (1.5 m) and 7’ (2.1 m) above the roof surface. For areas with 
average maximum yearly snow depths over 3' (0.9 m), mount the ISS at least 2' (0.6 
m) above this depth.

• Never install the ISS where it will be directly sprayed by a sprinkler system 

because the sprinkler water will adversely affect the readings.

• Avoid installations near bodies of water such as swimming pools or ponds.
• Do not locate the ISS under tree canopies or near the side of buildings that create 

“rain shadows”. For heavily forested areas, site the ISS in a clearing or meadow.

• Site the ISS in a location with good sun exposure throughout the day.
• For agricultural applications:

• Install the ISS so that it is between 5' (1.5 m) and 7’ (2.1 m) above the ground and 

in the middle of the farm between similar crop types (i.e. two orchards, two vine-
yards, or two row crops), if possible.

• Avoid areas exposed to extensive or frequent applications of agricultural chemi-

cals (which can degrade the sensors).

• Avoid installation over bare soils. The ISS performs best when installed over 

well-irrigated, regularly mowed grass.

• If the last three guidelines cannot be met, install the weather station at the edge 

of the primary crop of interest.

Siting Guidelines that may Affect the Anemometer 
• For best results, mount the ISS so that the anemometer so thatit is at least 7’ (2.1 m) 

above surrounding obstructions such as trees or buildings that may obstruct wind 
flow.

• If mounting the ISS on a roof, mount it so that the anemometer is at least 7' (2.1 m) 

above the roof apex.

• The standard for meteorological and aviation applications is to place the anemom-

eter 33' (10 m) above the ground. Seek professional help for this type of installa-
tion.

• The standard for agricultural applications is to place the anemometer 6' (2 m) above 

the ground. This is important for evapotranspiration (ET) calculations.

Note: 

For roof mounting, and ease of installation, we recommend using the optional mounting tripod (#7716). 
For other installations, use the Mounting Pole Kit (#7717). See “General ISS Installation Guidelines” on 
page 10

Note: 

For more detailed siting suggestions, see Application Note #30 on the Davis Support web site 
(http://www.davisnet.com/support/weather).