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Low Dew Point / Humidity since latest release

From build 3044 the development baton passed to Mark Crossley. Mark has been responsible for all the Builds since. He has made the code available on GitHub. It is Mark's hope that others will join in this development, but at the very least he welcomes your ideas for future developments (see Cumulus MX Development suggestions).

Moderator: mcrossley

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hw1958
Posts: 29
Joined: Mon 06 Jan 2020 4:49 pm
Weather Station: Davis Vantage Pro 2
Operating System: Windows 10

Low Dew Point / Humidity since latest release

Post by hw1958 »

It appears that since I installed the latest release (3183) that the humidity / dew point falls markedly during the evening and overnight e.g. at the moment (22:24 BST, 18 May it us reading 48% humidity and TD 1 C when it should be up around 11 C. Strangely come the morning it quickly rises back to where it should be. Any thoughts anyone?
Dennisdg
Posts: 220
Joined: Tue 07 Feb 2012 9:42 am
Weather Station: Davis Vantage PRO2
Operating System: Windows 11 Pro 64 Bit
Location: Camberley

Re: Low Dew Point / Humidity since latest release

Post by Dennisdg »

I had similar reading a while back but NOT after a CumulusMX update. The cure was to clean the weather Radiation Shield and the sensor itself with a light bruch. The Radiation Shield had a large amount of spider web and dust.
Dennis

https://g4glp.co.uk

Davis Vantage PRO2
Win 11 Pro 64 bit
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mcrossley
Posts: 12641
Joined: Thu 07 Jan 2010 9:44 pm
Weather Station: Davis VP2/WLL
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Location: Wilmslow, Cheshire, UK
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Re: Low Dew Point / Humidity since latest release

Post by mcrossley »

The humidity readings just come from your station, or are you saying the values in CMX are different from your station console?
hw1958
Posts: 29
Joined: Mon 06 Jan 2020 4:49 pm
Weather Station: Davis Vantage Pro 2
Operating System: Windows 10

Re: Low Dew Point / Humidity since latest release

Post by hw1958 »

No the readings are the same. It just seems bizarre that during the day the TD / humidity seems Ok but then it very quickly falls in the late afternoon / evening e.g. this evening TD fell from 10.7C at 17:11 L to 2.5 C at 1735L.
Mapantz
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Joined: Sat 17 Dec 2011 11:55 am
Weather Station: Davis Vantage Pro2
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Location: Dorset - UK
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Re: Low Dew Point / Humidity since latest release

Post by Mapantz »

Are you using a Davis VP2 by any chance?
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hw1958
Posts: 29
Joined: Mon 06 Jan 2020 4:49 pm
Weather Station: Davis Vantage Pro 2
Operating System: Windows 10

Re: Low Dew Point / Humidity since latest release

Post by hw1958 »

It appears that the humidity sensor was u/s. I have replaced it and all now seems ok. It was confusing as it seemed to fail at the same time that I uploaded the latest Cumulus software
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