I currently have a VP2 on the roof and a Vue in the garden.

I have been monitoring their readings for a week now (rainfall has been spot on, exactly the same even in very windy conditions and the Vue is sheltered). The Vue is 2m off the ground.

There is about 0.6'C difference (Vue lower) between the temps during the day and night and if the skies are clear there's about 1.2'C between them.

We all know that you shouldn't really be taking the temp above the roof and the 2m location is more accurate. So, since the Vue is going soon, off to my parents' house do I

a) Leave the VP2 alone
b) Calibrate the VP2 temp so it's more accurate. Probably by -0.8'C.

I used to have the Vue on the roof for 2 years so have weather records since then. Just thinking if I calibrate then the records are off straight away if you know what I mean.

Would welcome your thoughts/comments.

 

Cheers

Jon

 

Hi and welcome to the forum. Personally I have never installed a weather station on a roof as I don't think the readings would be accurate enough - mostly due to warming escaping from the home, the solar heating of the roof, and being high up it's more exposed to the wind.

Ideally 2m off the ground is far better, ideally on grass and a biggish distance from any warming sources like homes/roads/concrete/brick. I have the luxury of living next to a big open space so my weather station is in an open field 2m off the ground and I'd say my readings are 99% accurate because of this.

I have installed a weather station in a friends garden about 1 mile away in exactly the same way I have done my own station but their temps are usually 1.5C to 2C higher all year round than here mostly due to the "urban heat island effect" and depending on the weather conditions.

So in a nutshell there are many factors that coincide with installing a weather station. It takes some planning.

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Is it possible to locate the VP2 to where the VV was?

General ISS Siting Guidelines

• Place the ISS away from sources of heat such as chimneys, heaters, air conditioners

and exhaust vents.

• Place the ISS at least 100' (30 m) away from any asphalt or concrete roadway that

readily absorbs and radiates heat in the sun. Avoid installations near fences or

sides of buildings that receive a lot of sun during the day.

• Ideally, place the radiation shield of the ISS 5' (1.5 m) above the ground in the middle

of gently sloping or flat, regularly mowed grassy or naturally landscaped area

that drains well when it rains. For areas with average maximum yearly snow

depths over 3' (0.9 m), mount the ISS 2' (0.6 m) above this depth.

• Never install the ISS where it will be directly sprayed by a sprinkler system

because it will adversely affect the readings.

• Avoid installations near bodies of water such as swimming pools or ponds.

• Do not locate the ISS under tree canopies or near the side of buildings that create

“rain shadows." For heavily forested areas, site the ISS in a clearing or meadow.

• Site the ISS in a location with good sun exposure throughout the day if the ISS is

wireless or includes solar radiation or UV radiation sensors.

 

 

 

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Cheers for the replies.

Alan nice to see you aren't far from me 😉.

The Vue was originally on the roof, the same place the Pro2 is. It's on a steel 10ft pole about 2 feet above the roof of the house.

Never had any problems with it but do know the ideal place is 2M off the ground but the garden is too sheltered for wind readings. I have no choice for now but to have it on the roof. One option for thought is to place the temperature unit 2M above the ground and extend the anemometer cable so that can stay on the roof. Will involve a bit of work for that though.

For now I was just wondering if the calibration would help to make it be more accurate as I can see it gets about on average 0.8'C warming on the roof.

I could just not worry about it and continue but I like more accuracy 😝 😝 .

Alan I'll bookmark your website and here's mine for reference www.weather-live.co.uk/oldham/. I'm also on Twitter @ChadWeather.

Thanks again.

Cheers
Jon

Cheer Jon no problem 

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Cheers Jon no problem 

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