Curious how electronic thermometers can fail.

Water/moisture getting into the sensor. Any plastic covering or insulation may have become brittle and is starting to crack? Wires corroding/oxidising?

Is the temperature sensor a thermocouple - just two dissimilar wires connected together?

Or it might be the glass bead type: a tiny bead (0.2mm diameter typically) suspended by two vanishingly thin platinum wires all in a glass encapsulation. This type should last indefinitely outdoors but the electronics connected to it will require periodic recalibration (certainly at much less than 10 years!)

How many times do you check the temperature? IME, I've had errant (or even no) readings at odd times, or even several times a day. I've never worked out why, but I wouldn't be surprised if there's some interfering RF which messes with the weather station reception of the transmitted signal

In addition, the weather itself (and other factors) can affect the reliability of the wireless transmission:

If you search on: temperature wireless transmission interference you'll get loads of hits.

Dunno where you are, but are you aware of METAR?

I use this site.

Mine too. One thing that can happen in high winds and wet weather is evaporative cooling

By the way 'smart' does not always mean 'accurate'

I dunno. Ive been calibrating my home built thermostats...i need to subtract about 4°C to allow for the heat generated by the Raspberry PI PICO affecting the sensor on the same circuit board :-)

Air movement if I used them outside would likely totally change that.

Depending where you are right now there might be a considerable variation in air temperature going on ...it was near freezing last night but the temp is in double figures in many places.

Who knows. I use semiconductor three wire sensors - TMP36

I'd expect an old style gauge to use some sort of NTC thermistor. Any corrosion in series will probably make it read low, however. But leakage across it could make it read high...

And its very common for corrosion to create salts which when wet conduct...

Every time I have suspected this device it's own LCD display (should have mentioned that !) reads the same as the receiver

I have a very cheap chinese made clock in my bedroom. As well as telling time it also displays the temperature however there are no air holes or slits anywhere in the outer casing. I haven't taken it apart but my guess the sensor is mounted on the same circuit board as the rest of the electronics and is obviously measuring the temperature inside of the sealed enclosure. A quick comparison with another electronic thermometer suggests that's in error by at least 4C if it claiming to be the ambient temperature of the room. It's somewhat useless as a feature.

Ah... :-)

It's extremely mild for the time of year.

The weather forecast has said high winds but a marked change to higher temperatures than we have seen recently.

Storm Bert...dreadful name...has led to ClimateChange of around 20°C in just a day.

From -2°C to +18°C

Now remind me how much global climate change is...0.5°C in 30 years?

er ... that sounds like "weather". We occasionally see it in the UK.

Sssh!. Didn't you know?

Ed Milliband has declared there is 'no such thing as weather - only Scary ClimateChange™'

You can get done for non-criminal hate crime for just using the word.

The average yearly temperatures of Edinburgh and Exeter differ by 2.2degC. People seem to survive that.

Climate Change [tm] is a scam anyway. How does giving $300bn every year to 'poor countries' (*still* not enough for them) reduce CO2?? It's just an excuse for the redistributionists to fleece Western taxpayers out of their hard-earned wedge AFAIC.

The best one I heard was an ex pilot very familiar with the lapse rate

'To eliminate all the warming the UK has undergone since 1970, stand on a brick'

Well there I do agree.

Irrespective of any science, ClimateChange™ is a boondoggle of astounding scope.