Mt. Baker accumulated 1,140 inches of snowfall in 1998–99; Mammoth recorded 715 at Main Lodge in 2022–23. These are sums of snowfall from different seasons, not snowpack depths or guarantees for a future trip.
Huge snowfall figures invite images of white walls and buried lifts. But understanding an extraordinary season starts with the measurement. Are we adding up fresh snowfall over several months or measuring what remains on the ground on a particular day?
Mt. Baker and Mammoth provide two documented stories that answer that question. The point is to read their records correctly and preserve the location and period attached to every figure.
Mt. Baker 1998–99: the period is part of the record
The history published by Mt. Baker Ski Area in Washington records 1,140 inches for 1998–99. The National Weather Service places that total between July 1, 1998 and June 30, 1999 and identifies it as a United States seasonal snowfall record.
The conversion gives 28.956 metres of snowfall. Expressing the total in metres helps convey its scale, but does not change what it measures: accumulation over the period. It does not mean there was a uniform wall of almost 29 metres of snow across every slope.
Mammoth 2022–23: read Main Lodge and summit separately
Mammoth publishes 715 inches in its Main Lodge table for 2022–23: 18.161 metres after conversion. The operator describes that season as its snowiest on record and mentions close to 900 inches at the summit. That second number is approximate and refers to a different location.
Choosing the larger number and leaving out where it was measured would produce a misleading comparison. To cite Mammoth accurately, keep 715 attached to Main Lodge and the 2022–23 season; if you mention the summit, retain the qualification that it is approximate.
Sources for this section: 3
Snowfall, depth and water: different questions
Total snowfall adds up new snow. Snow depth describes the snow on the ground at the measured place and time. Snow water equivalent expresses how much water would result from melting that snowpack. Swapping these measurements completely changes the meaning of a report.
NSIDC explains that snowpack changes: recent snow can be loose, while older layers can become dense or develop crusts through melting and refreezing. Wind and melting also alter local depth. That is why accumulated snowfall does not remain as one intact column.
What a record tells you when choosing a destination
These winters help tell the story of two mountains. They are neither annual averages nor forecasts; they also do not compare the frequency of good visibility or available lifts. An exceptional season does not automatically describe your group’s future experience.
When you encounter a big number, ask about the variable, measurement site, units and dates. Then return to the map and operating report for your trip. Preserving those details lets you enjoy the history without turning it into a snow promise.
Frequently asked questions
Do inches and metres describe different data?
Here they are conversions of the same total: one inch equals exactly 0.0254 metres. Changing units does not turn snowfall into snow depth.
Can I compare 1,140 and 715 to choose the mountain with better snow?
Not as a sole criterion: they refer to different seasons and sites. A record is neither a forecast nor a measure of the quality of a particular day.
Sources and editorial approach
This guide draws on the linked sources. We distinguish historical facts, announced dates and conditions that need a current check. Confirm operations, access and services with the destination operator before booking.
- Mt. Baker Ski Area: snowfall history
- National Weather Service: record as of June 30, 1999
- Mammoth Mountain: Main Lodge and summit snowfall
- NSIDC: science of snow
- NSIDC: snow water equivalent