IdHunter, we get a hot dry season here from May-Oct. where many species like blacktail deer, jackrabbits, etc go almost exclusively on the night shift. Curiously, bobcats don't seem to mind the heat or the light as much. I've found them out "mousing" (hunting gophers, actually) at noon in the middle of a meadow that was baking in 100° heat, more than once.
Photography dictates that I'm out early and late for the best light of the day. While I do call at dawn a fair amount, I just don't find bobcats showing up then. Maybe they take longer on a full belly? Anyway, they tend to show up only midmorning, or late in the afternoon/early evening.
I've also discovered they're especially not out and about on snowy winter mornings until it warms up a bit. Last winter, I scouted one educated cat's tracks, seeing several times where it rode out snowstorms in a stand of old (fire-hollowed) live oaks, waiting until ten AM to hunt for quail and mice for an hour or so, perhaps getting cold and wet before cutting almost straight downhill about 1K feet (to about 3,500 ft), to a southwest slope with no snow left by noon. My best guess as to why being that this was the only spot where it could catch the sun and dry out. (They're cats, after all.)
For the first few years, I plotted all my bobcat sightings on my paper topos (which tells you how long ago that was!), and noted the weather and moon phase of each. No moon was a no starter, at least for daytime bobcat calling. I found a first quarter moon to it waxing full and a little beyond, was best, with a couple of days before full being prime. The day before a winter storm hit was also prime.
I've used a number of different calls in recent years, but haven't yet found anything better than a series of 18-20+ KHz Crit R Call rabbit sequences, followed up with lipsqueaks as they get close. Might mention too that I have never once been able to provoke one that I've called close into doing much of anything--other than sulk away-- with my best (voice) growls, hisses, and caterwauling noises. Couple of times I have been cautioned with low growls when I've followed closely behind after they'd came and went.
LionHo