Five-second answer

Claim we investigated

Seattle is one of the rainiest major cities in the United States.

Misleading. Seattle gets about 39 inches a year, less than Miami or New York, but rain falls on many days. NOAA’s standard 1991–2020 climate normals show 39.34 inches of annual precipitation at Seattle-Tacoma International Airport. Using the same NOAA station method, Miami records 67.41 inches, New Orleans 63.35, Houston 51.84, Atlanta 50.43, New York’s Central Park 49.52, and Boston 43.59. Seattle’s reputation is still understandable because measurable precipitation occurs on roughly 156 days and most of its rain falls during a prolonged cool season.

Quote or cite this fact-check

FactHub rates the claim “Seattle is one of the rainiest major cities in the United States” Misleading (high confidence): Seattle gets about 39 inches a year, less than Miami or New York, but rain falls on many days. Reviewed October 6, 2026. https://facthub.org/n/article/seattle-rainiest-major-us-city/2

One-minute summary

What the evidence establishes

  • Rainiest can mean greatest annual precipitation, most days with measurable precipitation, greatest intensity, or some combination; those measures produce different rankings.
  • Seattle-Tacoma International Airport’s 1991–2020 normal annual precipitation is 39.34 inches, calculated from NOAA’s twelve monthly normals.
  • Comparable NOAA stations in Miami, New Orleans, Houston, Atlanta, New York, and Boston all receive more normal annual precipitation than Sea-Tac.
  • Seattle has roughly 156 days per year with at least 0.01 inch of precipitation, making wet weather frequent even when individual events are light.
  • About 70 percent of Sea-Tac’s normal annual precipitation falls from October through March, while July and August are comparatively dry.
  • The airport station is a consistent regional benchmark, not a measurement of every Seattle neighborhood or every place in the Puget Sound region.
Important context: Weather | Fact check. This article separates total precipitation from the frequency and seasonal persistence of wet weather. No single comparison is complete by itself. The conclusion is strong because NOAA station normals, occurrence statistics, regional climate descriptions, and multiple city comparisons converge.

The evidence

The conclusion rests on the combined record. Expand each item to see its role and limitations.

Independence note: This check uses 4 methods across 4 institutions and 1 country or international grouping.
Evidence map
Method Institution / country Year(s) What it shows Key limitation Primary links
Thirty-year station climate normal and reproducible monthly-total calculation National Centers for Environmental Information United States 1991, 2020, 2021, 2026 For NOAA station USW00024233 at Seattle-Tacoma International Airport, the twelve 1991–2020 monthly precipitation normals sum to 39.34 inches. Monthly values range from 0.60 inch in July to 6.31 inches in November. October through March contribute 27.65 inches, about 70 percent of the annual total. A climate normal describes a thirty-year average, not what will happen in a particular year. Sea-Tac is south of central Seattle, and precipitation varies across neighborhoods, elevation, and the wider Puget Sound region. NOAA National Centers for Environmental Information NOAA National Centers for Environmental Information
Like-for-like comparison using NOAA 1991–2020 station normals National Centers for Environmental Information United States 1991, 2020, 2026 Applying the same twelve-month calculation gives 67.41 inches at Miami International Airport (USW00012839), 63.35 at New Orleans International Airport (USW00012916), 51.84 at Houston Intercontinental Airport (USW00012960), 50.43 at Atlanta International Airport (USW00013874), 49.52 at New York Central Park (USW00094728), and 43.59 at Boston Logan Airport (USW00014739). Each exceeds Sea-Tac’s 39.34 inches. This is a transparent comparison set, not a census or official ranking of every major U.S. city. Major city has no single meteorological definition, airport and central-city stations are not identical settings, and summing displayed monthly values introduces at most small rounding differences from an unrounded annual normal. NOAA National Centers for Environmental Information NOAA National Centers for Environmental Information
Precipitation-occurrence normals and local climate summaries National Centers for Environmental Information, National Weather Service United States 1991, 2020, 2026 NOAA and National Weather Service climate summaries put Seattle near 156 days per year with at least 0.01 inch of precipitation. That is frequent compared with many high-total cities, where more rain can fall during fewer and heavier events. Frequency therefore supports calling Seattle often wet, but not highest in annual volume. A day with 0.01 inch and a day with several inches both count as one measurable-precipitation day. The measure also includes liquid-equivalent precipitation rather than only conversationally defined rain, and occurrence normals can differ slightly by station or normal period. NOAA National Centers for Environmental Information National Weather Service
Monthly normals and regional topographic climate analysis National Centers for Environmental Information, National Oceanic and Atmospheric Administration, National Park Service United States 1991, 2020, 1985, 2026 Sea-Tac’s normals show a pronounced wet season from October through March and a dry summer, with only 1.57 inches combined in July and August. NOAA’s Seattle climate description and National Park Service regional guidance explain how Pacific storms and the Olympic Mountains create sharp precipitation differences across western Washington. Topography explains regional patterns but does not assign a single amount to the entire metropolitan area. Cloud cover, daylight, drizzle, and public perception are related to the reputation but are not interchangeable with measured precipitation totals. NOAA National Centers for Environmental Information National Oceanic and Atmospheric Administration National Park Service
1. NOAA normals put Sea-Tac near 39 inches per year

For NOAA station USW00024233 at Seattle-Tacoma International Airport, the twelve 1991–2020 monthly precipitation normals sum to 39.34 inches. Monthly values range from 0.60 inch in July to 6.31 inches in November. October through March contribute 27.65 inches, about 70 percent of the annual total.

Limit: A climate normal describes a thirty-year average, not what will happen in a particular year. Sea-Tac is south of central Seattle, and precipitation varies across neighborhoods, elevation, and the wider Puget Sound region.

Verify: U.S. Climate Normals Quick Access 1991–2020 U.S. Annual and Seasonal Climate Normals Documentation

2. Several major-city stations receive substantially more precipitation

Applying the same twelve-month calculation gives 67.41 inches at Miami International Airport (USW00012839), 63.35 at New Orleans International Airport (USW00012916), 51.84 at Houston Intercontinental Airport (USW00012960), 50.43 at Atlanta International Airport (USW00013874), 49.52 at New York Central Park (USW00094728), and 43.59 at Boston Logan Airport (USW00014739). Each exceeds Sea-Tac’s 39.34 inches.

Limit: This is a transparent comparison set, not a census or official ranking of every major U.S. city. Major city has no single meteorological definition, airport and central-city stations are not identical settings, and summing displayed monthly values introduces at most small rounding differences from an unrounded annual normal.

Verify: U.S. Climate Normals Quick Access U.S. Climate Normals

3. Frequent measurable precipitation explains part of the reputation

NOAA and National Weather Service climate summaries put Seattle near 156 days per year with at least 0.01 inch of precipitation. That is frequent compared with many high-total cities, where more rain can fall during fewer and heavier events. Frequency therefore supports calling Seattle often wet, but not highest in annual volume.

Limit: A day with 0.01 inch and a day with several inches both count as one measurable-precipitation day. The measure also includes liquid-equivalent precipitation rather than only conversationally defined rain, and occurrence normals can differ slightly by station or normal period.

Verify: Comparative Climatic Data Western Washington Climate Information

4. Seattle’s rain is concentrated in a long cool season

Sea-Tac’s normals show a pronounced wet season from October through March and a dry summer, with only 1.57 inches combined in July and August. NOAA’s Seattle climate description and National Park Service regional guidance explain how Pacific storms and the Olympic Mountains create sharp precipitation differences across western Washington.

Limit: Topography explains regional patterns but does not assign a single amount to the entire metropolitan area. Cloud cover, daylight, drizzle, and public perception are related to the reputation but are not interchangeable with measured precipitation totals.

Verify: U.S. Climate Normals Quick Access Climate of Seattle, Washington Weather in Olympic National Park

Common questions

“It rains all the time in Seattle, so it must be one of the rainiest cities.”

Frequent rain and large annual totals are different measurements. Seattle has many measurable-precipitation days, but individual events are often modest enough that several major-city stations accumulate much more water over a normal year.

“Comparing Sea-Tac Airport does not prove how much rain falls in Seattle.”

That is a real limitation. Sea-Tac is the region’s long-running official airport station and permits consistent comparisons, but it does not represent every neighborhood. The claim is therefore about the standard Seattle-area benchmark, not every point within city limits.

“Miami and New Orleans get hurricanes, so their totals should not count.”

Climate normals intentionally include the weather a location normally experiences over a thirty-year period. Tropical rainfall is part of those cities’ climates, just as Pacific winter storms are part of Seattle’s. A separate comparison of rainy-day frequency can answer a different question.

“Seattle is gray even when it is not raining.”

Cloudiness and short winter daylight can strengthen the rainy impression, but they do not add to a rain gauge. This article evaluates precipitation amount, frequency, and seasonality rather than claiming that annual precipitation measures the whole lived experience.

“Some places near Seattle are much wetter, so the verdict is wrong.”

Precipitation varies sharply across western Washington, especially with elevation and exposure to the Olympic and Cascade ranges. The original claim concerns Seattle as a major city; wetter mountain and coastal locations do not determine Seattle’s city comparison.

Conclusion

Seattle’s rainy reputation is understandable but imprecise. At the standard Sea-Tac station, NOAA’s 1991–2020 normals total 39.34 inches per year—well below comparable stations in Miami, New Orleans, Houston, Atlanta, New York, and Boston. Seattle is distinctive instead for roughly 156 measurable-precipitation days, a long wet season, and relatively dry summers. The most accurate conclusion is that Seattle is frequently wet, not one of the nation’s rainiest major cities by annual precipitation. Confidence: High for the station comparisons; moderate for broad rankings because major city and rainiest have no single official definition.

How we checked

  1. Defined rainiest separately as annual precipitation amount, measurable-precipitation frequency, and seasonal persistence.
  2. Selected NOAA’s recommended 1991–2020 standard climate-normal period rather than a single recent year.
  3. Used Seattle-Tacoma International Airport station USW00024233 as the reproducible Seattle-area benchmark.
  4. Summed the twelve monthly precipitation normals displayed by NOAA Quick Access for Sea-Tac and each comparison station.
  5. Compared Sea-Tac with named major-city stations using the same period and method: Miami USW00012839, New Orleans USW00012916, Houston USW00012960, Atlanta USW00013874, New York Central Park USW00094728, and Boston USW00014739.
  6. Checked occurrence statistics and National Weather Service summaries to distinguish wet-day frequency from precipitation volume.
  7. Reviewed NOAA and National Park Service regional climate explanations for seasonality and topographic context.
  8. Recorded the absence of an official definition of major city or rainiest, the airport-versus-city limitation, and rounding of displayed monthly normals.

Editorial note: Scope: this article tests a popular comparison of Seattle with other major U.S. cities; it does not rank every municipality, metropolitan area, or weather station. Values are 1991–2020 normals available through October 6, 2026, and will change when NOAA adopts a later standard normal period. No external meteorologist review has been recorded. Independence note: the evidence represents one country, multiple stations, three federal scientific or land-management sources, several measurement types, and records summarized over three decades. Reader verification checklist: 1. Open NOAA Quick Access and select the named station IDs. 2. Add the twelve monthly precipitation values. 3. Confirm that all cities use the 1991–2020 period. 4. Distinguish inches per year from days with at least 0.01 inch. 5. Check every limitation before generalizing from an airport station. Challenge this fact-check by identifying the specific conclusion disputed and providing verifiable evidence that could change it. Credible challenges deserve review and a visible response.

Expert-review status

No external meteorologist review has been recorded. Station identifiers, calculations, sources, and limitations are provided for direct reader verification.

Funding and conflicts

Funding: No external funding was received for this fact-check.

Ownership: FactHub is responsible for the article and its editorial process.

Conflicts: No known conflicts of interest are declared.

Sources

Sources are labeled by their role so readers can evaluate the evidence independently.

  1. Primary station-normal data NOAA National Centers for Environmental Information. U.S. Climate Normals Quick Access Identifier: NOAA U.S. Climate Normals 1991-2020

    Interactive official source for 1991–2020 monthly temperature, precipitation, and snowfall normals by station; used for all named city calculations.

  2. Method and variable definitions NOAA National Centers for Environmental Information. 1991–2020 U.S. Annual and Seasonal Climate Normals Documentation Identifier: 1991-2020 Annual/Seasonal Normals Documentation

    Documents the standard normal period, station products, precipitation variables, calculation methods, and quality controls.

  3. Dataset provenance and access NOAA National Centers for Environmental Information. U.S. Climate Normals Identifier: U.S. Climate Normals 2020

    Official product page explaining the climate-normal releases, recommended periods, products, and access methods.

  4. Cross-city occurrence comparison NOAA National Centers for Environmental Information. Comparative Climatic Data Identifier: Comparative Climatic Data

    Official tables designed to compare climatic elements, including precipitation occurrence, among major U.S. observing stations.

  5. Local station summaries and occurrence records National Weather Service. Western Washington Climate Information

    Official access point for Seattle-area monthly, annual, and normal climate summaries, including precipitation-day thresholds.

  6. Regional climate explanation National Oceanic and Atmospheric Administration. Climate of Seattle, Washington Identifier: NOAA Seattle climate publication

    NOAA technical description of Seattle’s marine climate, terrain influences, precipitation seasonality, and local variability.

  7. Topographic and rain-shadow context National Park Service. Weather in Olympic National Park

    Explains the extreme precipitation contrasts created by the Olympic Mountains west of Seattle.

  8. Article photograph provenance and licensing Wikimedia Commons. File: Seattle (WA, USA), Space Needle -- 2022 -- 1498.jpg Identifier: Wikimedia Commons file

    Original file page identifying the photographer, dimensions, description, and CC BY-SA 4.0 license.

  9. dataset NOAA U.S. Climate Normals Quick Access

    Search each station ID and download or inspect its 1991–2020 monthly normals.

    Identifier: NOAA Quick Access
  10. report 1991–2020 U.S. Climate Normals documentation

    Definitions and methods needed to interpret the station values and precipitation-day thresholds.

    Identifier: NOAA Normals Documentation
  11. report Climate of Seattle, Washington

    Regional explanation of why Seattle has a prolonged wet season without exceptional annual totals.

    Identifier: NOAA Seattle Climate

Update history

  1. Rating standardized under FactHub's verdict rules (was a free-text finding); the headline now states the finding. The evidence and conclusion are unchanged.
  2. Initial draft comparing Seattle’s annual precipitation, wet-day frequency, and seasonal pattern with NOAA normals for other major U.S. cities.

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