Tonight, biking felt like swimming in a cold lake and finding small comfort in its warm spots. I was so attuned to these temperature fluctuations because I rode home after sunset in shorts and a light sweater. First, I noticed the warmth of cars that had just turned off their engines; then, passing large groups of brick and cinder block buildings. It was like an exercise in understanding passive solar and thermal mass. With that subject in mind, I was quite amazed at the warmth radiating from the hulking concrete jungle of downtown and, by contrast, the chill coming off the grassy expanse of City Park.
The chance to appreciate microclimates, just one more reason to ride a bike!