Winter weather in the DC region is notoriously fickle. A small change in temperature, sometimes just a degree or two, can mean the difference between snow, sleet, a glaze of ice or a cold, miserable rain. Understanding how these precipitation types form helps explain why forecasting winter storms in the Mid-Atlantic is so challenging, and why impacts can vary so much from place to place.
Here’s how the four main types of winter precipitation take shape in the D.C. area.
Snow
How it forms:
Snow occurs when temperatures are below freezing from the cloud level all the way to the ground. Snowflakes form in the cold middle atmosphere and never encounter warm air on their way down, allowing them to reach the surface intact.
DC sits near the climatological rain-snow line in winter. Arctic air can spill south easily, but warm air from the Atlantic or Gulf of Mexico is often nearby. That makes snow possible, but far from assured.
Impacts:
The effects of snow can be benign, disruptive or paralyzing depending on how fast it falls, how long it lasts and how cold it is. The combination of heavy snow and freezing temperatures can lead to traffic gridlock but a lighter snow at milder temperatures can melt on contact with little impact.
The weight of the snow also matters. Heavy, wet snow can cling to and snap tree limbs and powerlines, leading to utility outages. It’s difficult to shovel and plow and is hard on both backs and hearts. Powdery snow is generally less of a problem, but it is more easily whipped around by high winds, building tall drifts and limiting visibility.
Sleet
How it forms:
Sleet starts as snow higher in the atmosphere. As it falls, it passes through a layer of above-freezing air, causing the snowflakes to partially or fully melt. Then, just before reaching the ground, the precipitation falls back into subfreezing air and refreezes into small ice pellets. The source of that warm air layer is typically the mild water of the Atlantic Ocean.
In the DC area, sleet often appears briefly during transitions between snow and rain — but on rare occasions, it can dominate a storm.
Impacts:
Sleet is slippery and can pile up quickly. But unlike freezing rain, sleet usually bounces off trees and power lines, limiting damage. Still, heavy sleet accumulations can be extremely difficult to remove and can shut down travel.
Notable sleet storms:
January 25, 2026: About 3 inches of sleet fell on top of 4 to 6 inches of snow and consolidated into a rock hard conglomeration dubbed “snowcrete." Historically cold weather followed the storm and the snowcrete took weeks to melt blocking roads and causing prolonged school closures.
February 10-11, 1994: A storm produced up to 4 inches of sleet, closing schools, the Federal government and numerous businesses.
Freezing rain
How it forms:
Freezing rain also begins as snow. But instead of refreezing before reaching the ground, the precipitation remains liquid as it falls through a shallow layer of subfreezing air near the surface. The raindrops then freeze on contact with cold surfaces, forming a hard, clear glaze.
Impacts:
Freezing rain coats everything — roads, sidewalks, trees and power lines — with a layer of ice.
Freezing rain can be the most disruptive form of winter precipitation in the Mid-Atlantic. Roads become treacherous, and ice accumulation on trees and power lines can lead to prolonged outages, especially concerning when cold air lingers afterward.
Notable ice storms:
- January 17-18, 1994: One of the region’s most severe ice events led to widespread outages and damage. So much ice accumulated that road crews could not remove it and the storm was followed by temperatures plunging below zero.
- February 10-11, 1994: The same storm that produced up to 4 inches of sleet in the immediate D.C. area deposited a thick glaze of freezing rain in its far southern suburbs, from Fredericksburg into Southern Maryland. Some areas were without power for one to two weeks and lost 10 to 20 percent of their tree canopies, according to the National Weather Service.
- February 14, 2007: A mix of snow, sleet and freezing rain fell around DC but mostly freezing rain fell into far southern suburbs, leaving behind a half-inch to ¾-inch glaze over southern Prince George’s and northern Anne Arundel counties where more than 100,000 customers lost power.
Cold rain
How it forms:
Rain occurs when temperatures are above freezing from cloud to ground. In winter, this often happens when mild air surges northward ahead of a storm system.
Why it still matters:
Cold rain can be unpleasant, but it’s usually the least disruptive winter precipitation type. However, when rain falls on snowpack and is followed by a freeze, it can create a layer of ice that worsens travel conditions later.
Why DC gets so many “mixed” storms
The Washington region sits at a crossroads of competing air masses:
- Cold, dense air from Canada can wedge southward near the ground east of the Appalachians; the process is known as cold air damming.
- Warmer air from the Atlantic or Gulf can override it aloft
This setup creates ideal conditions for a wintry mix, especially sleet and freezing rain, and explains why winter forecasts often hinge on fine-scale temperature details.
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