Definition and measurement of a white Christmas
A white Christmas in the United States is commonly understood as having snow on the ground on December 25. In everyday usage, people often refer to any snowy or wintry Christmas as a white Christmas, but operational definitions are stricter. The classic benchmark is at least 1 inch (2.5 cm) of snow on the ground in the morning after midnight in many local weather offices, though some stations use different thresholds. Snow depth is measured in the early morning to avoid daytime melting or new snowfall. Because Christmas is a calendar date rather than a fixed weather event, a white Christmas is not guaranteed anywhere in the USA and varies by year and location. The following sections explain where it is most common, how it is measured, and how climate trends affect its likelihood over time.
Where white Christmases are most common in the USA
White Christmases are most likely across the northern tier of the contiguous United States and throughout Alaska, with frequency decreasing toward the Southeast and southern plains. Key regions include parts of the Mountain West, the Upper Midwest, the Northeast, and interior Pacific Northwest. In these areas, historical snow cover on December 25 is relatively common, especially in higher elevations and inland locations farther from moderating ocean influences. By contrast, much of California, the Gulf Coast, and the Southeast have a low probability of a white Christmas because temperatures often stay above freezing and snow is rare. The map of probability is closely tied to elevation, latitude, and distance from large bodies of water that stabilize temperatures.
Probability by broad region (typical historical range)
- Very high probability (historical climatology): Northern interior Alaska, highest elevations of the Rockies, parts of northern Montana and North Dakota.
- High probability: Upper Midwest (Minnesota, Wisconsin, Michigan), Northeast (Adirondacks, parts of New York and New England), parts of the Cascades and Sierra Nevada.
- Moderate to low probability: Plains, Midwest, and Northeast at lower elevations; mixed outcomes in the Pacific Northwest depending on year
- Low to very low probability: Much of California, the Southeast, Gulf Coast, and southern plains
How the National Weather Office defines and reports a white Christmas
Local National Weather Service offices typically define a white Christmas based on measured snow depth of at least 1 inch (2.5 cm) on the ground at or shortly after midnight on December 25. Some offices may use other traditional thresholds, but the 1-inch criterion is widely cited for consistency. Snow depth is usually measured in the early morning as part of routine climate observations. Because many offices cover multiple counties, the reported probability reflects historical patterns across that area rather than a guarantee for a specific city. The distinction between “at least 1 inch” and “any snow on the ground” matters for official statistics and for travelers planning around a classic snowy Christmas image.
Official definitions used by key offices (illustrative)
| Office region | Measured threshold | Typical reporting timeframe | Source type |
|---|---|---|---|
| National Weather Service New York / Upton | ≥1 inch snow depth | Morning observation ~7–8 a.m. local | Operational climatology |
| National Weather Service Fairbanks / Alaska Region | ≥1 inch snow depth | Morning observation ~7–8 a.m. local | Operational climatology |
| National Weather Service Seattle / Tacoma | ≥1 inch snow depth | Morning observation ~7–8 a.m. local | Operational climatology |
Historical frequency and long term trends
Historical analyses show that a white Christmas is not common across most of the contiguous United States, even in regions where snow falls in winter. In general, probabilities greater than 30 percent are limited to the northernmost and highest-elevation locales. Farther south, probabilities drop into single digits or near zero for many December dates. Climate trends indicate reduced snow cover duration and fewer days with snow on the ground in many lower-elevation areas, which in turn lowers the long-term likelihood of a white Christmas in those regions. Elevation remains a strong predictor: higher mountain locations retain a higher probability even as surrounding lowland probabilities decline. Users interpreting year-to-year variation should distinguish between noisy weather patterns and the underlying, slowly changing climate influence.
Illustrative historical frequency ranges (approximate)
| Location type | Typical historical probability of ≥1 inch snow on Dec 25 | Time period commonly referenced |
|---|---|---|
| Interior Alaska (e.g., Fairbanks area) | 60–80% | 1991–2020 normals |
| Northern Rockies (e.g., higher elevations, Montana) | 40–60% | 1991–2020 normals |
| Upper Midwest (e.g., Minnesota, Wisconsin) | 30–50% | 1991–2020 normals |
| New England higher elevations | 20–40% | 1991–2020 normals |
| Mid-Atlantic lower elevations | 5–15% | 1991–2020 normals |
| Southern Plains and Southeast | 1991–2020 normals |
Practical implications for travelers and planners
If you are aiming for a classic snowy Christmas, prioritize higher-elevation and northern locations, and remain flexible about exact dates and resorts. Check historical probabilities for specific regions rather than relying on year-to-year headlines, because December weather can vary substantially. For urban travelers, a white Christmas is rare in most major cities outside the Mountain West and Northeast, so adjust expectations accordingly. When visiting mountain resorts, early-season snowfall and elevation are the best predictors of Christmas-week conditions. Travelers should also monitor short-range forecasts in the days leading up to December 25, since storm timing can shift snow into or out of the holiday window. Remember that climate trends are gradually reducing the frequency and depth of snow cover in many lower-elevation areas, which affects long-term planning.
Frequently asked questions about white Christmas in the USA
- What counts as a white Christmas in the United States? Officially, many National Weather Service offices use at least 1 inch (2.5 cm) of snow on the ground at or after midnight on December 25.
- Which US city has the highest chance of a white Christmas? Cities in interior Alaska, such as Fairbanks, and higher-elevation locations in the northern Rockies and Upper Midwest historically have the highest probabilities.
- Is a white Christmas becoming less common? In many lower-elevation and western regions, snow depth and duration have declined in recent decades, which reduces the likelihood compared to historical baselines, though year-to-year variability remains large.
- Does it have to snow on Christmas Day to be a white Christmas? No. The defining criterion is snow on the ground after midnight, which can come from previous days’ snowfall.
- How reliable are long-range forecasts for a white Christmas? Forecasts beyond about 7–10 days have limited skill for specific storm tracks; climatological probabilities are more useful for planning than extended deterministic predictions.