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Latest Cumulus MX V4 release 4.0.1 (build 4023) - 16 May 2024
Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 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
How come?
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- Posts: 280
- Joined: Fri 15 Aug 2008 5:22 pm
- Weather Station: WH 1081 (EasyWeather type)
- Operating System: Win10
- Location: Garforth, W. Yorks, UK
- Contact:
How come?
How come almost all of the local to me stations, on the various sites, agree with my systems air temperature within +/- one degree C at 29C, yet the more official stations indicate much lower temperatures, nearer to 24C? It is not solar radiation, because it is overcast, besides my sensor is in a double Stevenson screen. It also feels like 29C and a second outdoor thermometer agrees closely with it.
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- Posts: 274
- Joined: Tue 28 May 2013 1:06 am
- Weather Station: Davis VP2 Plus
- Operating System: Raspian Buster (RPi 3b)
- Location: Tulsa, OK
Re: How come?
Microclimate maybe?
- mcrossley
- Posts: 12953
- Joined: Thu 07 Jan 2010 9:44 pm
- Weather Station: Davis VP2/WLL
- Operating System: Bullseye Lite rPi
- Location: Wilmslow, Cheshire, UK
- Contact:
Re: How come?
I'd agree microclient. the "official" stations tend to be in open grassy areas (airfields, or rural), whereas UK amateur stations are usually suburban or semi-suburban
- beteljuice
- Posts: 3292
- Joined: Tue 09 Dec 2008 1:37 pm
- Weather Station: None !
- Operating System: W10 - Threadripper 16core, etc
- Location: Dudley, West Midlands, UK
Re: How come?
... but harrys location is rural - however when I checked earlier against the 'popular' rather than 'offical' met sources they were more in accord with 'H'
......................Imagine, what you will KNOW tomorrow !
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- Posts: 280
- Joined: Fri 15 Aug 2008 5:22 pm
- Weather Station: WH 1081 (EasyWeather type)
- Operating System: Win10
- Location: Garforth, W. Yorks, UK
- Contact:
Re: How come?
..and inline now at 05:06 official 19C as reported 05:00 my graph at 05:00 shows 19.2C.
The big differences I was seeing during the hotter parts of the days. Numerous other private stations agreeing generally with my temperature, but wildly different (lower) from official sources.
The big differences I was seeing during the hotter parts of the days. Numerous other private stations agreeing generally with my temperature, but wildly different (lower) from official sources.
- mcrossley
- Posts: 12953
- Joined: Thu 07 Jan 2010 9:44 pm
- Weather Station: Davis VP2/WLL
- Operating System: Bullseye Lite rPi
- Location: Wilmslow, Cheshire, UK
- Contact:
Re: How come?
Hmm, I don't have the exact location, but according to WU, not that rural afai can see, in a suburban estate with a car park not too far away? Certainly not open fields.
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- Posts: 3403
- Joined: Wed 06 May 2009 6:29 pm
- Weather Station: Davis VP2 with Daytime FARS
- Operating System: Windows XP SP3
- Location: Cheadle Hulme, Cheshire, England
- Contact:
Re: How come?
If your station is in a suburban back garden the nearby houses generate a lot of heat. My maxima is always 1-2C higher than Manchester Airport - 3 miles to the west.
In the very cold winter of 2010 my overnight minima was -11C but 2 miles away at my very open and rural work car park my car thermometer registered -15 but at Woodford aerodrome (3 miles away) the Met Office station located at the bottom of a long slope registered -18C.
That shows how much heat is generated in surburban areas. It's not wrong, just micro climate as others have said.
In the very cold winter of 2010 my overnight minima was -11C but 2 miles away at my very open and rural work car park my car thermometer registered -15 but at Woodford aerodrome (3 miles away) the Met Office station located at the bottom of a long slope registered -18C.
That shows how much heat is generated in surburban areas. It's not wrong, just micro climate as others have said.
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- Posts: 274
- Joined: Tue 28 May 2013 1:06 am
- Weather Station: Davis VP2 Plus
- Operating System: Raspian Buster (RPi 3b)
- Location: Tulsa, OK
Re: How come?
Mine is usually pretty close to my local airport temperature..usually within a degree or so. The humidity, due to my microclimate is always higher. Here's what my siting looks like.
Red circle is my ISS placement/anemometer placement.
Red circle is my ISS placement/anemometer placement.
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