Flagstaff, Arizona, exists in a climate of striking contrasts, where towering ponderosa pines meet high desert plateaus at an elevation of nearly 7,000 feet. This elevation is the primary driver behind its substantial average snowfall, setting it apart as the snowiest city in the United States among those with populations exceeding 100,000. While the surrounding Sonoran Desert basks in warmth, the city’s location within the Colorado Plateau ensures it captures significant moisture from Pacific storm systems, transforming it into a true winter wonderland for roughly half the year.
Annual Snowfall Averages and Historical Extremes
Understanding the average snowfall in Flagstaff requires looking at long-term climate data recorded at the airport, which serves as the official measuring point. The numbers illustrate a climate built for winter sports and scenic beauty, rather than mere novelty.
Metric | Value
Average Annual Snowfall | 101.5 inches (258 cm)
Average Days with Measurable Snow | 44 days
Average Snow Depth (Peak) | 12 inches (30 cm)
These impressive averages mask the variability inherent in mountain weather. Some years bring light, powdery affairs, while others deliver paralyzing blizzards that close roads and create massive snowdrifts. The record for single-season snowfall stands at an astonishing 233 inches, set during the winter of 2019-2020, a testament to the immense power of atmospheric rivers colliding with the San Francisco Peaks.
Monthly Breakdown: The Core Winter Season
The bulk of the accumulation occurs during a concentrated window from December through February, though the season stretches further. During this period, the atmosphere is cold enough to ensure precipitation falls as snow, and storm tracks frequently target the region.
December: Often the month of first significant snow, with averages around 17 inches. The landscape frequently transforms overnight, creating a picturesque Christmas scene.
January: The heart of winter and typically the coldest and snowiest month, averaging approximately 21 inches. Deep snowpack and frozen lakes are common.
February: Maintains high snowfall averages, usually around 18 inches, keeping the winter scenery intact for Valentine’s Day and beyond.
November and March act as shoulder months, capable of producing memorable storms that add to the total average while offering quieter, transitional landscapes.
Geographic Variation Across the Region
It is crucial to note that "Flagstaff" encompasses a large area with significant elevation changes, leading to dramatic differences in snowfall accumulation. The city center sits at about 6,910 feet, but the surrounding Coconino National Forest and mountain resorts climb much higher.
Flagstaff City Center: Receives the bulk of the urban average, reliably seeing over 100 inches annually.
Arizona Snowbowl & San Francisco Peaks: Located just north of the city, this ski area sits between 9,200 and 11,500 feet, often recording totals exceeding 150 inches.
Lower Elevations (e.g., Lake Mary, Parks): Just a few miles away in higher country, snowfall can be slightly less intense but still substantial, typically ranging from 80 to 100 inches.
