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    How come?

    Talk about the weather
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    harrym1byt
    Posts: 267
    Joined: Fri 15 Aug 2008 5:22 pm
    Weather Station: WH 1081 (EasyWeather type)
    Location: Garforth, W. Yorks, UK
    Contact:

    How come?

    Post by harrym1byt » Mon 23 Jul 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: 213
    Joined: Tue 28 May 2013 1:06 am
    Weather Station: Davis VP2
    Operating System: Raspian Jessie
    Location: Tulsa, OK

    Re: How come?

    Post by BigOkie » Mon 23 Jul 2018 2:12 pm

    Microclimate maybe?

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    mcrossley
    Posts: 5996
    Joined: Thu 07 Jan 2010 9:44 pm
    Weather Station: Davis VP2
    Operating System: Stretch Lite rPi
    Location: Wilmslow, Cheshire, UK
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    Re: How come?

    Post by mcrossley » Mon 23 Jul 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: 2821
    Joined: Tue 09 Dec 2008 1:37 pm
    Weather Station: None !
    Operating System: ex XP SP3 - now W10 laptop grr
    Location: Dudley, West Midlands, UK

    Re: How come?

    Post by beteljuice » Tue 24 Jul 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: 267
    Joined: Fri 15 Aug 2008 5:22 pm
    Weather Station: WH 1081 (EasyWeather type)
    Location: Garforth, W. Yorks, UK
    Contact:

    Re: How come?

    Post by harrym1byt » Tue 24 Jul 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
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    Re: How come?

    Post by mcrossley » Tue 24 Jul 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
    Posts: 2733
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    Weather Station: Davis VP2 with Daytime FARS
    Operating System: Windows XP SP3
    Location: Cheadle Hulme, Cheshire, England
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    Re: How come?

    Post by RayProudfoot » Tue 24 Jul 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: 213
    Joined: Tue 28 May 2013 1:06 am
    Weather Station: Davis VP2
    Operating System: Raspian Jessie
    Location: Tulsa, OK

    Re: How come?

    Post by BigOkie » Tue 24 Jul 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.
    Google Maps.png
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