What prompts this melancholy key?

Wet 1

Wet 2

Wet 3

Wet 4

Wet 5

These photographs were taken in Luukki on March 28th, which was a wet and foggy day.

I commuted by bicycle today. In the morning I had some backwind, but during the day the speed of wind rose from 5 m/s to 15 m/s, and thus I had a strong headwind when coming back home. It took 37 minutes to get to work, and 50 minutes back home.

(Posting title is from the poem 1 January 1965 by Joseph Brodsky.)