A December blizzard of the month is a notable winter storm recognized during a specific month, typically through a combination of strong sustained winds, heavy snowfall or blowing snow, and sharply reduced visibility that meets local or regional blizzard criteria. Unlike one-off events that fade quickly in public memory, a storm labeled "blizzard of the month" often persists in weather records, news coverage, and forecasting reference material because it represents a benchmark winter event for that period. This explainer outlines how such storms are defined, how they form, the impacts they can bring, and why they remain relevant for forecasters, emergency managers, and the public.
Defining a Blizzard and the "Month" Context
The term blizzard refers to a severe snowstorm distinguished by sustained winds or frequent gusts of 35 miles per hour (56 kilometers per hour) or more, and considerable falling and/or blowing snow that reduces visibility to a quarter mile (400 meters) or less for an extended period. The exact criteria can vary by country and agency, but these elements—wind, snow, and visibility—are consistent hallmarks. Adding "of the month" typically highlights a storm that stands out among other winter events within a given month, often because of its intensity, size, or impact on populated areas. In many cases, the phrase is used by forecasters and media to distinguish a particularly memorable event in an otherwise active season.
Official Blizzard Criteria
While definitions vary slightly, the following table summarizes common elements used to qualify a winter storm as a blizzard and how the "of the month" label adds contextual emphasis.
| Attribute | Verified Detail | Source Type |
|---|---|---|
| Wind Speed | Sustained winds or frequent gusts of 35 mph (56 km/h) or higher | Meteorological standard (U.S. National Weather Service) |
| Visibility | Less than 1/4 mile (400 m) due to snow and/or blowing snow | Meteorological standard |
| Duration | Conditions expected to persist for at least 3 hours | Meteorological standard |
| Month Context | Storm stands out relative to other events in the same month | Operational/media usage |
| Impact Emphasis | Often chosen for widespread travel disruption, power issues, and public attention | Forecast and emergency reports |
How December Blizzard Conditions Form
December blizzard conditions typically arise from a combination of large-scale atmospheric patterns and localized dynamics. A strong jet stream disturbance can amplify temperature contrasts between polar and mid-latitude air masses, while a low-pressure system draws moist air northward from the Gulf or other relatively warm water bodies. Cold air at the surface allows snow to develop and accumulate, while strong vertical motion in the atmosphere sustains moderate to heavy snowfall rates. When dry air wraps into the storm from the west or northwest, snowflakes can evaporate and recrystallize, producing loose, blowing snow that contributes to sharply falling visibility. Ground conditions also matter: if snow is already on the ground, additional snowfall and wind can easily create blinding snowdrifts.
Key Ingredients at a Glance
- Strong pressure gradient and jet stream disturbance to generate high winds.
- Moisture feed from maritime sources to sustain heavy snowfall.
- Deep cold air at the surface to keep precipitation as snow and support accumulation.
- Dry slots or cold-air advection to create blowing snow and visibility reduction.
- Flat or unobstructed terrain in some cases to allow unimpeded wind flow and snow transport.
Typical Impacts and Hazards
December blizzard conditions can produce widespread travel disruptions, school and business closures, and significant challenges for utilities and emergency services. Whiteout conditions make driving extremely hazardous or impossible, while drifting snow can block roads and isolate communities. Accumulating snow and ice on power lines and tree limbs may cause outages, particularly in regions unaccustomed to heavy, wet snow. Coastal areas near open water can experience additional concerns such as lake-effect snowbands or elevated water levels if the storm is accompanied by strong onshore flow. Public health and safety risks rise with prolonged exposure to cold temperatures and reduced ability to access medical care or supplies.
Common Impacts Table
| Impact | Typical Manifestation | Notes |
|---|---|---|
| Travel Disruption | Road closures, flight cancellations, delays | Often widespread and prolonged |
| Power Outages | Localized to regional outages from wind and snow load | Duration varies with repair complexity |
| Isolation | Rural or coastal communities cut off for periods | Requires coordinated response for supplies |
| Public Safety Risks | Hypothermia, falls, carbon monoxide exposure | Emphasizes the need for preparedness |
Preparedness and Response Considerations
Being ready for a potential December blizzard starts well before the storm arrives. Individuals and households can maintain an emergency kit with essentials such as non-perishable food, bottled water, medications, flashlights, extra batteries, blankets, and a battery-powered or hand-crank radio. Those who rely on medical equipment or prescription medications should plan for alternative power and supply options. Families and communities can review communication plans to ensure everyone knows how to stay in contact if roads are closed or power is out. Emergency management agencies often provide guidance on travel restrictions, shelter options, and how to report outages or dangerous conditions.
Quick Preparedness Checklist
- Stock at least 3 days of non-perishable food and water.
- Keep flashlights and extra batteries accessible, avoid candles if possible.
- Ensure medications and any medical needs are accounted for.
- Charge devices and have backup power options when available.
- Confirm heating fuel or alternative warmth plans are in place.
- Review local guidance on travel and shelter during severe events.
Historical Context and Variability
The history of December blizzards includes a wide range of events, from coastal storms affecting dense urban centers to slower-moving systems that dump heavy snow over several days. Some months have multiple notable storms, while other Decembers are relatively quiet. Factors such as sea surface temperatures, soil moisture, and broader circulation patterns like the Arctic Oscillation or El Niño can influence how often and how intensely blizzard conditions occur. As a result, a December blizzard of the month in one year may be part of a broader active pattern, whereas in another year it could represent a rare and particularly disruptive event. Understanding this variability helps forecasters and the public avoid overgeneralizing from single events.
Preparing for Future December Blizzard Events
Because winter storm behavior can be highly variable, ongoing preparedness is more effective than last-minute reactions. Monitoring forecasts from reliable sources, understanding local vulnerability (such as rural isolation or coastal exposure), and maintaining flexible plans can reduce risk. Communities can strengthen resilience through clear communication protocols, accessible public shelters, and coordinated utility and transportation responses. Individuals benefit from practicing their own emergency plans, keeping supplies updated, and checking on neighbors who may need extra assistance. By treating a December blizzard of the month as a manageable, though serious, type of winter event, people can stay safe and maintain continuity even when conditions are severe.
Summary and Key Takeaways
A December blizzard of the month is a high-impact winter storm that meets standard blizzard criteria and stands out within its month due to intensity, impacts, or public attention. These storms are defined by strong winds, reduced visibility, and disruptive snow conditions, and they form from a combination of atmospheric dynamics and temperature profiles. Their effects on travel, power, and public safety underscore the importance of preparedness and accurate forecasting. Recognizing the ingredients, impacts, and historical variability of such events supports more effective planning and response, helping communities and individuals stay safe across future winters.