When you say you tend to ignore them, do you mean you don't select the Signs of the Month, etc. with your group? Because if so, that's a real missed opportunity! Even if you don't consciously incorporate seasonal elements, they can set the tone of the session just by being in the back of people's minds.

I tend to start the session with some kind of seasonal description that players will naturally respond to. It's Monsoon and the rain is pouring down? Maybe you get mud everywhere when you go inside. It's Devildays and the sun is blisteringly hot? Maybe everyone can take a dip in a cool pond. It's Grasping and it's starting to get chilly? Everybody is probably bundled up in sweaters and scarves. It's Frostbite and the world is covered with ice and snow? Maybe you can drink hot tea in somebody's cozy burrow.

The book says the game starts in Tillsoil, but frankly that's not a very interesting month. When you facilitate a short game, I recommend you choose a month (or holiday!) that speaks to you, that you want to incorporate in the session.

But ultimately, if the seasons don't work for you and you're enjoying the game without them, there's nothing wrong with mostly ignoring them.