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Patrick Lockyer.
Grand Master
Username: pat_lockyer

Post Number: 2049
Registered: 9-2004
Posted on Monday, 04 February, 2019 - 06:47 pm:   Edit PostDelete PostView Post/Check IP

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David Gore
Moderator
Username: david_gore

Post Number: 3128
Registered: 4-2003
Posted on Tuesday, 05 February, 2019 - 07:40 am:   Edit PostDelete PostView Post/Check IP

Pat,

I suspect this is a sun-enhanced air temperature reading whereas the official temperatures are from a fully shaded and well-ventilated standard enclosure which are always less than that recorded by a thermometer/thermocouple in an unshaded location.
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Patrick Lockyer.
Grand Master
Username: pat_lockyer

Post Number: 2051
Registered: 9-2004
Posted on Tuesday, 05 February, 2019 - 08:15 pm:   Edit PostDelete PostView Post/Check IP

David, this was taken from the data on the sat nav screen with the car traveling on about January 16th.
BTW the outside sensor is fitted in the bottom of the o/s rear view mirror.
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David Gore
Moderator
Username: david_gore

Post Number: 3133
Registered: 4-2003
Posted on Tuesday, 05 February, 2019 - 08:43 pm:   Edit PostDelete PostView Post/Check IP

Pat, this explains the high reading due to the "glasshouse" effect from the mirror housing.

For comparison, the temperature at Marble Bar in North-West Australia was officially recorded as 49.3deg C in recent days. Having visited this place in summer in 1980, I can vouch it is at least 10 Celsius degrees and most likely 15+ Celsius degrees hotter than Sydenham/St Peters in Sydney which is the location shown on the Sat Nav. This location is close to Botany Bay and the cooling effect of the sea breezes from the nearby ocean/bay waters is present in this location except when the prevailing wind is from the North-West.

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