About the Snow Accumulation Calculator
Snowfall rate and ground accumulation are not always the same - wind causes drifting, compaction reduces depth, and warm surfaces melt snow on contact. This tool estimates how much snow will actually build up on surfaces over the next two days.
Why This Tool Matters
Snowfall forecasts drive everything from school schedules to plow deployment and grocery runs. Understanding accumulation timing and intensity helps you prepare before conditions deteriorate.
For a fuller winter picture, also check our Snowfall Predictor, Snow Depth Calculator, and Roof Snow Load Calculator — all powered by the same live forecast data.
How It Works
Track expected snow buildup on surfaces, roads, and walkways. Each time you calculate, this tool pulls live data from the Open-Meteo weather API - including temperature, precipitation, wind, visibility, and hourly forecasts - and applies our snow-focused scoring model for your exact location.
What We Analyze
- Hourly snowfall rates over the next 24-48 hours
- Total accumulation on ground surfaces
- Temperature profile affecting snow density and stickiness
- Wind-driven drifting and visibility reduction
- Storm track and duration from live forecast models
Formula & Methodology
2-day total = today snowfall + tomorrow snowfall
Scores are derived from live forecast data and regional winter weather thresholds. They are estimates for planning purposes - not official advisories.
How to Interpret Your Results
Compare your result to local NWS or Environment Canada forecasts for a complete picture.
- Light accumulation (under 2 in): Walkways may need minimal clearing.
- Moderate (2-5 in): Driveways and sidewalks need attention before commute.
- Heavy (5+ in): Plan for extended shoveling or professional removal.
When to Recalculate
Winter weather changes quickly. Recalculate before bed when a storm is approaching, again between 5-6 AM for school and commute decisions, and any time you receive a weather alert for your area. If conditions feel worse than your last result, trust your eyes and official sources over cached numbers.
Important: SnowDayCalculator.io tools are for informational and educational purposes only. They do not replace official school closure notices, National Weather Service warnings, or government travel advisories. Always follow directives from your school district, employer, and local authorities.