On a pleasant day, it’s difficult to work. One is distracted by the warmth and the sun. The mind wants merely to exist, not to toil vainly. On a cold day, it’s the opposite — which is to say, work remains impossible, but in this case because the conditions are baleful and ill-suited to productivity. A rainy, overcast day is similar: the mind itself feels overcast. The synapses don’t fire; to arrive at even a simple thought requires a sort of byzantine calculus.
Here’s an example of some days on which work is impossible.