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Why is the definite article used before mid-40s and 30s in this sentence from a Washington Post weather report?

Highs are mainly limited to the mid-40s, with wind chills in the 30s so bundle up.

I am confused because I don't see what is being specified and thus calls for the article, and also because the same site has other lines without the definite article. The following sentences contain a mix of usages with and without the article.

The incoming surge of colder air pushes lows into the mid- to upper 20s, with low 30s limited to downtown.

Winds finally begin to die down overnight under starry skies. Lows range from mid-20s to low 30s.

Highs get up to the more seasonable mid-50s. Overnight is clear, with lows in the upper 20s to mid-30s.

  • The refers to a range of numbers, e.g. the forties include the set of nine numbers from 40 through 49. As to why, it is just one of the many peculiarities of English. – DrMoishe Pippik Oct 23 '18 at 20:15
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The definite article is used there because mid-40s refers to a specific temperature range.

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