Hi, Kiva - the song is "July, You're a Woman," by John Stewart. I don't know if he recorded it with the Kingston Trio, but it has been available on various collections as a solo recording. I found the lyrics at a John Stewart Web page - click here.
-Joe Offer-

JULY, YOU'RE A WOMAN
by John Stewart

I can't hold it on the road
Where you're sitting right beside me
And I'm drunk out of my mind
Merely from the fact that you are here.

And I have not been known
As the Saint of San Joaquin
And I'd just a soon right now
Pull on over to the side of the road
And show you what it means

La da da da da da da
La da da da da da da
July, you a woman, more than anyone I've ever known.

Yeah I can't hold my eyes
On the white line out before me
When your hand is on my collar
And you're talking in by ear.

Oh, and I have been around
With a gypsy girl named Shannon
Daughter of the devil
It is strange that I should mention that to you
'Cause I haven't thought of her in years.

La da da da da da da
La da da da da da da
July, you a woman, more than anyone I've ever known.

Oh, I can't stand this - I just checked CDNow to see if the song is available on CD. Yes, it is - on recordings by Robert Goulet and Pat Boone. There are also three John Stewart CD's that have this song.