Yesterday I rode up City Creek Canyon. Temperatures in the Avenues were in the upper 40s when I left, which isn't too bad, but I fortuitously wore pair of insulated full-finger gloves and stuffed a soft-shell in my camelbak. Most of lower City Creek was fine, but the upper mile and a half is now almost fully shaded and quite cold on a day without wind. In addition, the road has some patches of snow on it now, with a complete coating at the top. Passable on a mountain bike and a road bike up to the very top, but very cold! What a microclimate.
Meanwhile, even though it was sunny and comfortable in the Salt Lake Valley, we're not "mixing out" the valley like we do in summer and early fall when a ridge builds in. Yesterday afternoon's sounding shows a pronounced capping stable layer based about 1000 m over the valley floor, which explains some of the hazy gunk that was lingering around the valley.