Regulation (EU) 2021/2237
An aerodrome shall not be specified as a destination alternate aerodrome unless the available current meteorological information indicates, for the period from 1 hour before until 1 hour after the estimated time of arrival, or from the actual time of departure to 1 hour after the estimated time of arrival, whichever is the shorter period:
(a) for an alternate aerodrome with an available instrument approach operation with DH less than 250 ft,
(1) a ceiling of at least 200 ft above the decision height (DH) or minimum descent height (MDH) associated with the instrument approach operation; and
(2) a visibility of at least 1 500m; or
(b) for an alternate aerodrome with an instrument approach operation with DH or MDH 250 ft or more,
(1) a ceiling of at least 400 ft above the DH or MDH associated with the instrument approach operation; and
(2) a visibility of at least 3 000m; or
(c) for an alternate aerodrome without an IAP,
(1) a ceiling of at least the higher of 2 000ft and the minimum safe IFR height; and
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