Temperature difference with height - Ground VS 7m

[chrisc85]

So I've got a couple of temperature sensors. One on my weather station is at 7m AGL. I've got another sensor that is about 1ft from the ground.

Currently the one at 7m is showing -0.9c, the one at 1ft is showing as -2.4c

Does this sound accurate or is it a problem with the sensors?

[nitrx]

The temperature by the ground is mosty colder in the night when it's clear and almost no wind

[steve]

The difference between the temperatures at those heights will vary depending on the conditions (as Ron says, whether it's clear, whether it's windy etc), so it's not possible to say for certain, but that difference is feasible.

[chrisc85]

Current conditions at my house are about -1.2c @ 7m AGL, around 15mph winds and about 60% humidity
At the ground it is well sheltered and about -2.3c

[AllyCat]

Hi,

Are either of these sensors in the "Maplin" (Fine Offset) weather station? The (generally rather better) Clas Ohlson version of the manual for this station only quotes the "temperature resolution" (0.1 degree C) but no accuracy figure. The "Maplin" manual does quote the accuracy as "+/- 1 degree C" so (even if within specification) the two sensors could indicate values 2.0 degrees apart for the same temperature.

Therefore, you may need to temporarily locate your two sensors at the same location to compare their measurements. BTW if you're unclear about the difference between "resolution" and "accuracy", if you look within, for example, Cumulus' alltime.ini log, you will see temperatures quoted with a resolution to 14 decimal places, but they are certainly not accurate to better than a trillionth of a degree!

Cheers, Alan.