Interesting study on the effect of a nearby road on weather observations.
Metrological evaluation of the effect of the presence of a road on near‐surface air temperatures https://rmets.onlinelibrary.wiley.com/doi/abs/10.1002/joc.7044
Even if the weather station is only 1 meter from the road & looking at the very rare outliers this produces for the worst situation (at night when the wind direction is just right) the effect is less than 2°C.
In monthly or annual means of the daily average temperature one would likely see no effect.
@VictorVenema Pretty interesting. Thank you for sharing. It is not large but also it is not negligible. I suppose, this kind of influences are totally documented in the homogeneization of environmental time series.
@pybonacci A change of 2°C would not be negligible. But the influence on a annual or monthly average would be much less.
Plus, no one puts a weather station 1 meter next to a road.
Plus what matters for climate change is the change. So even a station that is 1 meter next to a road for its entire time would not be affected.
If the entire surrounding in not suited that would be a problem. Or when the weather station is on a wall (typical in the 19th century) that is a problem.
@pybonacci Then you would relocate the station. (And a new village or new neighbourhood would definitely have a clear influence. Area matters.)
I do remember a farmer in America making volunteer precipitation observations who was apparently told that he should never change the position, in principle good advice, and then the inspector found that a huge stable was build next to it with the roof going over the rain gauge. 😊
Anything can happen in real life.
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