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Remember ''if you try to change your old data later'' it probably has already been rounded and applying a single conversion factor would cause inaccuracy. For instance in rainfall you can't get back exactly to mm to 1 decimal place from inches to 2 dp. For example, 0.01 in is 0.254 mm, which rounds to 0.3 mm, but 0.02 in is 0.508 mm, which rounds to 0.5 mm rather than 0.6.
You need to convert the old data first into whatever units your weather station works in (e.g. Fine Offset rainfall bucket is 0.3mm,
== Dates ==
Cumulus does require your computer SYSTEM short date to use a format with a separator between day, month and year in whatever format suits your region e.g. dd/MMM/yy, dd-MM-yy, MM/dd/yy and dd-MMM-yy are acceptable, but ddMMMyy is not suitable as a short date format with Cumulus. Any change to your short date format later is likely to give problems.
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