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Not trying to be mean, but why not use fractions if you need to be more precise? If you need to express "halfway between 20°C and 21°C" you could just say 20.5°C.
I can, but there's a phrase in talking about weather with Fahrenheit. When someone says the temp is going to be in the 70s all day, that accounts for the entire fluctuation from cooler mornings to hot afternoon. It's the grouping of temps in a range by 10 degrees and that the graduations are set just enough apart that on normal days the temps usually stay within 10 degrees during the day and drops by another 10 degrees overnight. This makes the phrase "it's going to be in the 70s all day" easy to understand especially when using my chart. You can usually bank on pleasant weather during the day and a need for long sleeves or a light jacket at night.
Fahrenheit ironically is the most base 10 like measurement for a non-SI measurement, at least when it comes to grouping temps by tens in relation to weather. Everywhere else I really do prefer Celsius.