A variation on a joke I heard from the UK Laugh Lab, customized for you snow-blog readers:

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Sherlock Holmes and Dr Watson go snow camping. After a day snowshoeing around the forest, they return to their camp, have some wine, and crawl into their sleeping bags.

Some snow flurries drift down.

Sherlock says to his friend "Watson, the snow is falling on us, what does that tell you."

Watson gazes up at the drifting flakes, thinks for a moment, then replies:
"Well, first off, I'd say that the forecast was wrong, but snow is notoriously difficult to predict so I won't disparage the meteorologist. About this particular snow, it appears to be nicely branched dendrites, so I'd deduce then that they formed near negative fifteen degrees, surrounded by small droplets. Furthermore, I'd...Er, what are you doing?"

Sherlock was out of his bag, looking around the camp.
"Watson, Someone has stolen our tent!"
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- JN