The number of weather stations recording very warm night - time temperatures and the frequency with which these occur has increased since the mid 1970s. (bom.gov.au)
«If we think of ice cores a bit like weather station records, you can see that we both need them everywhere and all the time,» he said. (earther.com)
The problem is that most weather station records are not kept for monitoring long term temperature trends. (globalwarmingsolved.com)