Please help me understand the poem "Winter Saturday" by Earle Birney.

In his poem “Winter Saturdays,” Earle Birney uses simile and metaphor to compare the farmers to the stages of the moth’s life cycle. A winter storm is over and the farmers emerge from their homes to go into town. He says that they come out of the wood in other words, they leave their homes and move to their vehicles which the author compares to cocoons. The vehicles encircle the farmer’s while they drive into town. As dusk is arriving they are driving toward the lights of town being drawn as moths are to light. They see the landmarks such as the water tank along the way. When they arrive in town they “hatch” from their vehicles to meet others, see a movie or perhaps dance to the music in a bar. The night was not all that they anticipated and the farmers make their way back in chrysalis form, surrounded by the hard outer covering of their vehicles. They go home, where once again the wind is bringing in snow, perhaps not to emerge again until spring.