I knit more in the summer. It's probably because I'm living according to an academic calendar right now, but it seems strange (foolhardy may be a better word) to be sitting with a lap full of wool when the temperature climbs past 100 degrees.
I try to sit in the shade, of course - air conditioning preferably - but sometimes it's hard to beat the heat and the knitting needles have to be set aside and ice coffee must be consumed in large quantities.
Right now I'm working on some projects using this colorway of yarn. A pair of mitts that I saw on Ravelry. I'll be posting images of them soon.