The Wacky World of Weather Stations: No. 214- Merredin (WA)

Tuesday 12/11/2019

Please refer back to my first post for site specifications and to No. 92- Logan City for 2018 specifications.  If you wish to check on this (or any) site for yourself, go to my post on how to check for yourself.

Station: Merredin 10092

Opened: 1903

Daily Temperature data from: 1966

Data used to adjust Acorn sites at: Cunderdin, Dalwallinu, Esperance, Morrawa.

Location:   Co-ordinates  -31.4756 118.2789

235km east of Perth.

BOM site plan 2013:

Google satellite image 2019:

Jo Nova’s photo October 2019:

For a number of reasons Merredin is not compliant with BOM specifications. The screen is on bare dirt, a few metres from vast areas of bitumen carpark and tennis and hard surface sports fields, 15 metres from a concrete footpath and bitumen street, with a fibro fence less than 20 metres to the south, and too close to large trees which may shade the screen in the afternoon. (The photo was taken at 2:20pm.)

But there is another feature of this station I want to highlight, as it is relevant to many other stations. Consider Jo Nova’s close up of the screen:

Note the thick mass of spider webs, indicating how little maintenance this (and all!) stations get- once a year. This may have little measurable effect on air circulation and temperature at this station, but there are very many stations close to bare soil or dirt tracks. A combination of spider webs, dew, and dust may have a much greater effect.

This Acorn station is non-compliant, with temperatures reported at Latest Weather Observations and used to adjust data at other Acorn sites.


Percentage of all Australian sites not compliant: 29.56%.

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2 Responses to “The Wacky World of Weather Stations: No. 214- Merredin (WA)”

  1. Bill in Oz Says:

    And observations from this dodgyBOM site are used to adjust ACORN station observations ?

    Utterly bloody stupid BOM !

  2. Australia's Wacky Weather Stations: Final Summary | kenskingdom Says:

    […] of a wharf shed, beside a multi-lane highway, shaded by trees, or in screens that are covered in spider webs, invaded by mud wasps, or used by cattle as a back-scratcher.  The area around the screens can […]

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