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Days In Month In SQL Server (without User Functions)

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SELECT CASE WHEN MONTH(DateTime) IN (1, 3, 5, 7, 8, 10, 12) THEN 31
            WHEN MONTH(DateTime) IN (4, 6, 9, 11) THEN 30
            ELSE DATEDIFF(dd, CAST(YEAR(DateTime) AS varchar(4)) + '-02-01', CAST(YEAR(DateTime) AS varchar(4)) + '-03-01')
       END AS 'days in month'
FROM Weather
...
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