Issues with Climate Change Trends Graphs
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I've been using the climate change data for a recent project I've been doing and I came to realize that the numbers just don't make sense when it comes to the precipitation graph. So, the correlation between the anomaly, the mean of that year and the historical mean makes no sense. The difference between that year mean and the historical mean should give you the anomaly, or am I doing it the wrong way? In any case I just have no idea where all this numbers in the graph are coming from, they just don't add up If you do the math for every single year it will give you different answers for each and everyone! I've also tried it with other locations and always come to the same results, there is a consistent 10mm difference between the various results. Captura de pantalla 2026-04-16 a la(s) 2.08.27 a. m..png
Thanks in advance! -
Hello, and thank you for your question.
The precipitation anomaly in meteoblue climate change data represents a deviation from the weekly or yearly mean but is not always calculated simply as the difference between the year mean and the historical mean. The anomaly calculation may include additional statistical methods or reference periods beyond direct subtraction. Furthermore, ERA5 precipitation data incorporates various precipitation types and is influenced by spatial and temporal resolution limitations, which can explain consistent differences such as the 10mm offset you noticed. Updates to datasets, model changes, and reanalysis methods can also contribute to these discrepancies.
We hope we were able to answer your questions and wish you pleasant weather with meteoblue.
