Only tried Humphreys once, in late October a few years back. Cold and snowy, then a lightning storm started as we reached the ridge between Agassiz and Humphreys. Had to beat a hasty retreat, so will have to go back some day.
There's a <a href="http://www.sfpeaks.org">webcam</a> that shows live pix of the area. From the webcam's location in Flagstaff, you can't see Humphrey's, itself...it is behind Agassiz from that angle.
(Humphreys and Agassiz are part of the same huge volcanic caldera that is collectively referred to as the San Francisco Peaks complex.)