In between Winter and Spring, where the temperature fluctuates between warm and cold

keep warm

warmth and coldness

warm up

warmed; mild and agreeable

inquire if it is cold or if it is warm, which refers to when somebody always sends his or her regards to another person, or shows a lot of care for other people

warm up

literally, not to sit long enough to warm the seat, which means very busy, did not had time to sit; to be constantly on the go

spring blossoms

warmth

warmly

heating

(noun) a vacuum flask; a thermos bottle; a hot water bottle

hot water bottle

heater

warm and cosy

feeling warm and comfortable.

warm colors

warming

an electric heater

when one is materially comfortable, one will be lustful