Snow Science History
P17 · Knowledge category · Reviewed 14 October 2026
Snow is a physical record of changing weather. Its crystals grow in clouds, accumulate on surfaces, change shape under pressure and temperature, and can be moved by wind. Understanding those processes makes everyday winter observations more meaningful.
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How snow crystals form
Snow crystals grow as water vapour deposits onto ice in sufficiently cold clouds. Their shapes depend on temperature, humidity and the conditions they…
Read section ↓Why snowpacks change after landing
Newly fallen snow does not remain unchanged. Compaction, wind, temperature gradients, thaw and refreeze can alter density, texture and surface hardness. A…
Read section ↓How wind reshapes snowfall
Wind can move loose surface snow into drifts while exposing nearby pavement. This means the height of a snowbank may not equal the actual snowfall…
Read section ↓Building an honest historical archive
A meaningful snowfall record needs a date, location, station or observation method and authoritative source. Future historical articles should distinguish…
Read section ↓The science behind winter conditions
How snow crystals form
Snow crystals grow as water vapour deposits onto ice in sufficiently cold clouds. Their shapes depend on temperature, humidity and the conditions they encounter while forming and falling. Official meteorological references distinguish snow from ice pellets and other frozen precipitation.
Why snowpacks change after landing
Newly fallen snow does not remain unchanged. Compaction, wind, temperature gradients, thaw and refreeze can alter density, texture and surface hardness. A fluffy accumulation can become difficult to remove after tire traffic and subsequent freezing.
How wind reshapes snowfall
Wind can move loose surface snow into drifts while exposing nearby pavement. This means the height of a snowbank may not equal the actual snowfall observed at a standard measurement site. On a home property, pay special attention to the areas where drifting repeatedly blocks entrances.
Building an honest historical archive
A meaningful snowfall record needs a date, location, station or observation method and authoritative source. Future historical articles should distinguish recorded snowfall, snow depth and anecdotal descriptions. This page deliberately provides no unsupported storm rankings, “record” totals or invented local weather history.
Practical homeowner checklist
Use these prompts as a starting point, adjusting for your property, local rules and current conditions.
- Identify the weather question you want to understand: formation, type, density or drifting.
- Compare observations from a named official location and date.
- Distinguish new snowfall from depth already on the ground.
- Record the source, unit and measurement method for historical figures.
- Avoid treating one photograph as a measured regional snowfall record.
Common questions
Are snow depth and snowfall the same quantity?
No. Snowfall measures new accumulation over a defined period, while snow depth describes the snow present on the ground at the observation point.
Will the archive include historical Toronto storms?
Yes, once each account can be supported by reliable dated records and clear citation.
Official references and further reading
Use current authoritative guidance for regulatory requirements, weather alerts, equipment and safety decisions. These are educational citations, not evidence of a service guarantee.
Continue learning
Canadian Snow & Climate
Why snow behaves differently across Canada
Explore topic →Weather & Snowfall Interpretation
Turn forecasts into useful decisions
Explore topic →Toronto Winter Knowledge
Local guidance, not service-area expansion
Explore topic →Seasonal Homeowner Preparation
Prepare before a storm creates urgency
Explore topic →Last editorial review: October 14, 2026. Information may change; check linked sources before relying on requirements or alerts.
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