Mine is Summer. Pretty obvious why. The heat, I could use some.

Fall. Perfect temperature, red leaves are more aesthetically pleasing, fewer bugs. Very comfortable, always has a nice, cool breeze -- without being freezing.

Winter is a close second, as snow is very aesthetically pleasing to me -- far more so than dead leaves and grass -- and there are no bugs.

Spring, mainly early spring. Seeing the grass turn green and the flowers bloom is fucking beautiful. I love the warm weather and the warm breeze that comes with it.

Yeah, Spring is beautiful <3.

Summer, but only at night.

Its warm, its dark, and the seasons have certain effects on me, Summer being the most positive (or the most negative depending on your point of view).

Summer, temperatur is right at any time (day/night), especially many showers and awesome fresh air afterwards. I'm loving it.

Winter purely for the snow.

Summer. You can go for walks at night wearing a t-shirt. The weather right now is pissing me off so much where I live. I want it to be warm so I don't have to worry about clothes.

Summer.

I enjoy all seasons equally.

They all have there ups and downs, so it is hard to choose a distinct one.

As much as I like Winter, the only thing I don't like is the flu.

Summer. Vacation time, good weather.
Close 2nd: Winter: Snow!

Summer. No school=STARCRAFT!!!

Summer, solely because of vacations (least favorite otherwise; I can't stand heat)
Spring is like summer without the vacation. Bad spring.
Fall is awesome temperature-wise, but lacks vacations.
Winter is very nice to look at, but it gets a bit cold and shoveling snow isn't fun. Eh, 3rd ater Fall and Summer.

Winter - <3 cold+snow+no humidity+no water problems.
Spring - it's pretty.
Fall - Thank you God for cooling the earth a little.
Summer - fuck its hot.

Summer 2007 sealed the deal for me. Here in NC in august 07, we had 80% RH, 0 days of rain, and 30/31 days of 90+ days. The one day under 90 was at 89. I was outside during most of that, and it caused millions of dollars in damages.

Late Summer, because beaches are fun.

Winter. Summer is too fucking hot

Summer. It's warm, nice, relaxing, lively...

Fall is cold and too much dust from leaves. As autumn proceeds it has a deeper and deeper depressing feeling.
Winter is too cold and snow is the worst thing to happen ever (it violates many of my senses and state of comfort in great excess). I feel empty and dead during the winter.
Spring is still cold and smells bad. It's getting warming and is optimistic.

... I hate the seasons. ;o

Spring. Just the right temperature, new growth, it's one of the few times I actually like it outside. Generally it's not too drab (like winter) or too bright (like summer).

Based on my observations, winter tends to be brighter than summer because the sun is low on the horizon and all the snow reflects the light everywhere. In the summer, I can look at the ground and the light wont bother my eyes as much ... in the winter, no matter where I look my eyes are in pain, watering, and I'm trying to force them open. ;o