Frodo: Summer, he loves to take walks with you, the summer air gives refreshment.

Sam: Spring, the flowers are fully blossomed, so he can pick them for you.

Pippin: Spring, sometimes the rain catches you both and you dance until it stops.

Merry: Autumn, the colours bring out the bright colour in your eyes.

Aragorn: Spring, he's well hidden in the rain, the air gives him a sense if relaxation.

Legolas: Autumn, the scent and colours remind him of Mirkwood, even though it hurts he has to remember, that's his state of relaxation.

Gimli: Summer, he hates the bitter cold of winter so summer air brings a smile upon his face.

***

Thorin: Winter, both of you growing old, snowflakes fall in your hair making your glistening silver hairs more visible, bringing Thorin thoughts of your eternal love.

Fili: Winter, the snowflakes falling in your hair (much like Thorin's) but he enjoys that when the air gets colder, you snuggle closer to him.

Kili: Autumn, the leaves flying around brings out the natural beauty of you and your surroundings.

Bilbo: Summer, the shire has many parties in this season which makes it easier for him to dance with you.

Bard: Spring, the smell of the air brightens his miid almost as much as you do.

Thranduil: Winter, the blandness of the snow makes the piercing colours in your eyes pop.