Are there multiple effects in the seasons?

I just had a cold summer in Kittens Game, which reduced my catnip field yield by 15%. Are there more different (and hopefully positive) effects? It took the whole summer before it was 'normal' again.

(I don't want to look in the faq, because I don't want to be spoiled too much)

No. The only thing in the game that currently checks the weather, is the getWeatherMod function, in "calendar.js", which returns 0.15 (+15% bonus) during warm seasons, and -0.15 (-15% penalty) during cold ones. Note that weather only changes when the season changes, and is added to the season's own effects; a warm spring is thus +65% to catnip, and a cold winter is -90%.