Frost in Hangzhou

On my run this morning, I noticed something new - frost on the grass. Today -- Dec. 19 -- is the first day it's been cold enough for frost in Hangzhou. A few weeks ago, it was about 45 degrees F inside our office, but they finally turned on the heat a few days later. I don't mind a cool office, but when my hands get so cold it's hard to type, that's too cold.