Sydney hits its highest temperature recorded since 1939 with Penrith reaching 47.3C

kiwijims · Guru

Sydney hits its highest temperature recorded since 1939 with Penrith reaching 47.3C

tiger5 · Senior Member

In 1939 it was recorded in Richmond NSW at 47.8 & that was in the shade.

aussie_paul · Guru

I should know this but aren't all official temps taken in the shade?

Aussie Paul. smile

rockylizard · Guru

Gday...

Installing a thermometer

A thermometer should be mounted so that air can pass freely over the bulb or sensor while being protected from direct sunlight and rain. The Stevenson screen (pictured) is an instrument enclosure that meets these requirements and is the standard at official Bureau sites.

The instrument enclosure should be located in the open, over a locally natural surface (for example grass, but not concrete), unaffected by nearby obstructions such as trees and buildings (at a distance of at least twice the height of obstructions, and preferably four times), and not placed in a hollow (which would render conditions unrepresentative). The screen door should face south in the southern hemisphere to avoid direct sunlight on the thermometers when making an observation. The thermometers should be placed in the shelter at about 1.2 m above ground level.

A compromise for those unable to construct or purchase a shelter would be to hang a thermometer from the branch of a tree with thick foliage, not too close to the trunk. It is important that the bulb is never in direct sunlight or close to buildings (which can radiate heat, particularly overnight).

http://www.bom.gov.au/climate/cdo/about/airtemp-measure.shtml

Cheers - John

aussie_paul · Guru

Thanks John.

Aussie Paul. smile

Aus-Kiwi · Guru

Yep right in it . Just oiled the deck-ing .. Then jumped in pool .

Cupie · Guru

rockylizard wrote:
Gday...
Installing a thermometer
A thermometer should be mounted so that air can pass freely over the bulb or sensor while being protected from direct sunlight and rain. The Stevenson screen (pictured) is an instrument enclosure that meets these requirements and is the standard at official Bureau sites.
The instrument enclosure should be located in the open, over a locally natural surface (for example grass, but not concrete), unaffected by nearby obstructions such as trees and buildings (at a distance of at least twice the height of obstructions, and preferably four times), and not placed in a hollow (which would render conditions unrepresentative). The screen door should face south in the southern hemisphere to avoid direct sunlight on the thermometers when making an observation. The thermometers should be placed in the shelter at about 1.2 m above ground level.
A compromise for those unable to construct or purchase a shelter would be to hang a thermometer from the branch of a tree with thick foliage, not too close to the trunk. It is important that the bulb is never in direct sunlight or close to buildings (which can radiate heat, particularly overnight).
http://www.bom.gov.au/climate/cdo/about/airtemp-measure.shtml
Cheers - John

Ah, brings back memories.

As a country technician (OIC of a 1 man station no less) some 50+ years ago, I had to ring in the daily readings on these. Can't remember what the measures were except .. Wet Bulb, Dry Bulb & Rainfall. I seem to recall some sort of graph too.