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Posted on May 5, 2024 (Updated on July 14, 2025)

Unraveling the Mystery: Explaining Snowfall in Above-Freezing Temperatures

Polar & Ice Regions

Unraveling the Mystery: Explaining Snowfall in Above-Freezing Temperatures

There’s something magical about watching snow fall, isn’t there? We usually think of it as a strictly below-freezing kind of thing, but here’s a fun fact: it can actually snow even when the temperature is a little above 32°F (0°C)! Sounds weird, right? Well, it’s all thanks to a cool combination of atmospheric conditions that let those delicate flakes make it all the way down to us, even when things are a bit warmer than you’d expect.

So, how does a snowflake even get its start? Way up high, in the chilly clouds, that’s where the magic begins. Up there, it’s definitely freezing i. Instead of turning into liquid, water vapor transforms directly into tiny ice crystals i. These crystals then start attracting more water vapor, which freezes onto them, and before you know it, you’ve got a snowflake! The exact shape of the snowflake depends on the temperature and how much moisture is floating around up there i. Pretty neat, huh?

Now, here’s where it gets interesting. Think about it: the air way up where the clouds are forming is much colder than the air near the ground i. You might have a cloud layer at a brisk 20°F (-7°C), while down here, it’s a relatively balmy 35°F (2°C) i. That difference is key. The snow can form in those frigid clouds and start its descent i.

But wait, wouldn’t it just melt on the way down? That’s where evaporative cooling comes to the rescue! As the snowflake falls through the warmer air, it does start to melt a bit i. But as it melts, it also evaporates, and that evaporation needs heat i. The snowflake grabs that heat from the air around it, which then cools that air down. It’s like the snowflake has its own personal air conditioner! This cooling effect slows down the melting, giving the snowflake a fighting chance to reach the ground i.

And get this: the drier the air, the better this cooling trick works i. Think of it like a sponge – a dry sponge will soak up more water, right? Same idea. Dry air allows the snowflake to evaporate faster, which means more cooling and less melting i. That’s why you’re more likely to see above-freezing snow in places where the humidity is low i.

Now, imagine a blizzard. If it’s snowing really, really hard, that can make a difference too i. If the snow falls fast enough, it can pile up on the ground before it has time to melt completely i. Plus, a heavy snowfall can actually cool the air around it, sometimes even down to freezing, which helps more snow stick around i.

You’ve probably noticed that not all snow is the same. When the temperature is close to freezing, you get that heavy, wet snow – the kind that’s perfect for snowballs i. That’s because the snowflakes are partially melted, making them sticky i. Colder temperatures produce drier, fluffier snow i.

There are a few other things that can help, too. Sometimes clouds have “supercooled” water droplets – water that’s still liquid even though it’s below freezing i. When those droplets bump into ice crystals, they freeze instantly, making more snowflakes i. Strong winds from above can also push cold air down quickly, giving the snowflakes less time to melt i. And if you live near a big lake, you might have seen “lake effect” snow, where cold air picks up moisture from the warmer lake and dumps a ton of snow on the downwind side, even if it’s a bit warmer than freezing i.

So, yeah, snowfall at above-freezing temperatures is a bit of a balancing act i. It needs cold air up high, enough moisture, and something to keep those snowflakes cool on their journey down i. It might seem odd, but it’s just another reminder of how amazing and complex weather can be i. Next time you see those flakes falling when it’s a little warmer than you expect, you’ll know the cool science behind it!

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