The opening is quite typical of mode I including many introits and also the Communio (Amen dico vobis) for these three extra Sundays at the end of November.
After reminding myself of this melody of Fr Weber’s I found the offertory Bendicam Dominum going through my head. It's more complicated, but similar in a few ways. Perhaps Fr Weber had it in mind?
For me the Regensburg melodies being in mode II and VIII are less suggestive of Fr Weber's melody. But the text Iam hiems transiit, imber abiit et recessit / surge amica mea et veni, with the clauses reversed, could work well with Fr ’s melody, I think.
To give a specific example about the similar introits Andrew mentioned, the opening notes resemble the common introit melody "Gaudeamus omnes in Domino", used on several feasts, with varying words.
Yes well the the beginning is very typical of Tone I Introits that we sing all the time but the rest is a little different... but I was just trying to see if this specific Antiphon is in Latin Somewhere... so that we don't have reinvent the wheel so to speak.
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