Depends on the season.
Summertime sun makes me slow. Not sleepy, just slow. I procrastinate more, I start to avoid social contact and generally just, I don't know, reduce my pace. I can't think properly when the temperature goes above 26-ish. Everything is just sluggish.
It also activates my allergy. I don't know what I am allergic to, but my nose turns into a faulty faucet, constantly leaking icky goo during summer mornings and summer evenings.
Summertime nights on the other hand; Ah, here we go. Bliss. Silk smooth air, warm enough to run around in a pair of shorts and a tee, cold enough to be able to do a proper work out. If the summer nights where as long as the winter nights, good lord I'd climb every building in the neighbourhood, letting out my happiness in gleeful nonsensical gibberish.
Rain makes me content. No matter what time of the year, I can sit and idly watch the rain for hours on end. I simply love the sound, the smell, the feel of it. I feel very much alive when it rains.
Snow.
Ah, here we go.
I function at my peak when there's a 2 meter deep layer of snow covering everything, no matter if I'm outside of inside. Falling snow makes me contemplative and thoughtful. My studies yield the most results when It's snowing.
Still snow makes me active and outgoing. I can run for hours on end.
Sunny winter days activates me. I am happy, innovative and alive whenever the temperature falls under 0. It's not the feeling that I am induced with when it rains, it's something more. I am fulfilled, whole. I can't explain it, it's just the way I work. No matter what, I will always prefer winter to any other season. -40 and the metal is creaking in pain? No problem. I know how to dress for it, and I have my equipment. I intuitively know what to do and how to act to preserve myself. In the very essence of the phrase, I am a winter person.