I think you posted a video of lightning before on the forum and can see the exposed area to the rear of your house.
Locate the station away from any buildings/walls if you can. In the middle of the garden at 4ft above short grass is best so the air can be mixed up and circulate.
Buildings (house) and walls can give off heat and this will affect the air temp and also you may lose rainfall measurements if sited near a structure. Expose the station site as much as you can to eliminate the above affects.
I use to live in a UHI (and done my best to site the station as exposed as i could. I recorded the local environmental conditions really. My new site is exposed better to the elements due to more rural location and away from any buildings.
All you can do is your best but most will not have the
perfect site for a station but if you can eliminate siting the station next to buildings/walls or anything that can give off heat, you will do alright. You would have a better site than i did when i use to live in Dublin.
