See this thread on hymn/carol tunes for more information. I copied the lyrics for "Tempus adest Floridum" from Cyberhymnal.org
-Joe Offer-

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TEMPUS ADEST FLORIDUM

Tempus adest floridum, surgent namque flores
Vernales in omnibus, imitantur mores
Hoc quod frigus laeserat, reparant calores
Cernimus hoc fieri, per multos labores.

Sunt prata plena floribus, iucunda aspectu
Ubi iuvat cernere, herbas cum delectu
Gramina et plantae hyeme quiescunt
Vernali in tempore virent et accrescunt.

Haec vobis pulchre monstrant Deum creatorem
Quem quoque nos credimus omnium factorem
O tempus ergo hilare, quo laetari libet
Renovato nam mundo, nos novari decet.

Terra ornatur floribus et multo decore
Nos honestis moribus et vero amore
Gaudeamus igitur tempore iucundo
Laudemusque Dominum pectoris ex fundo.

Words: 13th Century; first appeared in the Swedish Piae Cantiones, 1582

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I suppose I ought to work up my own translation, but I'm lazy. I found a partial translation here:

Now it's the time of flowers,
which rise from the earth.
Spring is everywhere, also in our spirits.
What the frost has damaged, will be repaired by the warmth.
Everything blossoms with much labor.

The warm winds are scented,
there are ripples on the blue waters,
the larks are singing in joy,
the sky is clear up above.
The flowers, destroyed by the fall, are reborn in new buds,
the pains of winter are forgotten,
all chains are released.