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?
Welcome to the Cumulus Support forum.
Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024
Cumulus MX V4 beta test release 4.0.0 (build 4019) - 03 April 2024
Legacy Cumulus 1 release 1.9.4 (build 1099) - 28 November 2014
(a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki
Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024
Cumulus MX V4 beta test release 4.0.0 (build 4019) - 03 April 2024
Legacy Cumulus 1 release 1.9.4 (build 1099) - 28 November 2014
(a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki
Temperature difference with height - Ground VS 7m
- nitrx
- Posts: 1297
- Joined: Sun 13 Dec 2009 1:21 pm
- Weather Station: WH1080
- Operating System: Windows 10
- Location: Apeldoorn The Netherlands
- Contact:
Re: Temperature difference with height - Ground VS 7m
The temperature by the ground is mosty colder in the night when it's clear and almost no wind
- steve
- Cumulus Author
- Posts: 26701
- Joined: Mon 02 Jun 2008 6:49 pm
- Weather Station: None
- Operating System: None
- Location: Vienne, France
- Contact:
Re: Temperature difference with height - Ground VS 7m
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.
Steve
-
- Posts: 8
- Joined: Wed 05 Dec 2012 6:55 pm
- Weather Station: Maplin
- Operating System: Win7
- Location: Reading
Re: Temperature difference with height - Ground VS 7m
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
At the ground it is well sheltered and about -2.3c
-
- Posts: 1124
- Joined: Sat 26 Feb 2011 1:58 pm
- Weather Station: Fine Offset 1080/1 & 3080
- Operating System: Windows XP SP3
- Location: SE London
Re: Temperature difference with height - Ground VS 7m
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.
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.