I checked DG and found that the time I saw hundreds of Monarchs was mid October, 2006. There was a cold front coming and the oak trees were nearly covered with them. I had camera, but couldn't get good photos of them in the trees, too high. I just enjoyed them with DH (who could have cared less). They flew north to south and literally up our street. At the time we had lots of flowers in bloom. I put out water, but they weren't interested. They were all gone the next morning. If I remember, it rained the next day.
Haven't seen very many here this year, and those were sort of ragged. Saw more at the lake. Thought we'd see some today after the front that blew thru, but we were gone most of the day to San Marcos. If they came, we missed 'em. Maybe tomorrow!