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How come?

Talk about the weather
harrym1byt
Posts: 260
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Weather Station: WH 1081 (EasyWeather type)
Location: Garforth, W. Yorks, UK
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How come?

Postby harrym1byt » Mon Jul 23, 2018 12:33 pm

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.

BigOkie
Posts: 212
Joined: Tue May 28, 2013 1:06 am
Weather Station: Davis VP2
Operating System: Raspian Jessie
Location: Tulsa, OK

Re: How come?

Postby BigOkie » Mon Jul 23, 2018 2:12 pm

Microclimate maybe?

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mcrossley
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Operating System: Stretch Lite rPi
Location: Wilmslow, Cheshire, UK
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Re: How come?

Postby mcrossley » Mon Jul 23, 2018 4:35 pm

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

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beteljuice
Posts: 2469
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Operating System: XP SP3 - honest
Location: Dudley, West Midlands, UK

Re: How come?

Postby beteljuice » Tue Jul 24, 2018 12:38 am

... 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' :clap:
Image
......................Imagine, what you will KNOW tomorrow !

harrym1byt
Posts: 260
Joined: Fri Aug 15, 2008 5:22 pm
Weather Station: WH 1081 (EasyWeather type)
Location: Garforth, W. Yorks, UK
Contact:

Re: How come?

Postby harrym1byt » Tue Jul 24, 2018 4:10 am

..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.

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mcrossley
Posts: 5192
Joined: Thu Jan 07, 2010 9:44 pm
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Re: How come?

Postby mcrossley » Tue Jul 24, 2018 7:10 am

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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RayProudfoot
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Location: Cheadle Hulme, Cheshire, England
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Re: How come?

Postby RayProudfoot » Tue Jul 24, 2018 8:38 am

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.
Cheers,
Ray, Cheshire.

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BigOkie
Posts: 212
Joined: Tue May 28, 2013 1:06 am
Weather Station: Davis VP2
Operating System: Raspian Jessie
Location: Tulsa, OK

Re: How come?

Postby BigOkie » Tue Jul 24, 2018 12:55 pm

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.
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