in Thoreau’s Journal:  

What interesting contrasts our climate affords! In July you rush panting into [a] pond, to cool yourself in the tepid water, when the stones on the bank are so heated that you cannot hold one tightly in your hand, and horses are melting on the road.

Now you walk on the same pond frozen, amid the snow, with numbed fingers and feet, and see the water-target bleached and stiff in the ice.

[water-target:   Aquatic plant with floating oval leaves and purple flowers; in lakes and slow-moving streams.]