According to the web sources I found, the slight warming effect of ageing weather station paint is a factor that can introduce non-climatic influences in the temperature measurements. This effect can be removed during the homogenization of weather station data for climate research by following some steps:

Metadata analysis and quality control: Changes in the measurement as well as in quality control procedures can be detected.
Building of a reference time series: Mostly a weighted average is calculated by using neighboring stations.
Breakpoint identification: It is searched for in-homogeneities in the difference between the weighted average and the candidate or in the candidate time-series itself.
Data adjustment: It is decided which breakpoints are accepted as in-homogeneities. At the end the assessed discontinuities are adjusted and the data is corrected.
The aim of climate data homogenization is to adjust climate records, if necessary, to remove non-climatic factors so that the temporal variations in the adjusted data reflect only the variations due to climate processes.
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