The analysis and visualization apps provide prepoulated code examples for converting from C to F and vice versa when you click to add a new item. https://thingspeak.com/apps/matlab_analyses/templates
Are you using the Mathworks weather Station or your own temperature data? The mathworks temperature data is in F, but the tutorial https://www.mathworks.com/help/thingspeak/analyze-your-data.html shows some steps for converting as well.
If you can provide your visualization code, it may be easier to spot the problem.
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