Seattle represents a cool maritime environment where persistent wetness, Puget Sound chloride exposure and sulfate background matter more than heat.
Marine humidity is the primary stressor. Chloride and wetness is the secondary driver for reliability and field durability decisions.
CE classes describe overall environmental severity and are not equivalent to ISO corrosivity classes.
A normalized 0-100 matrix showing which exposure mechanisms dominate the deployment environment. Scores describe environmental load intensity, not failure probability.
Seattle is a useful engineering reference for cool maritime exposure: corrosion relevance can be high even when heat stress is modest.
The Pacific Northwest atmospheric layer adds calibrated chloride context around Puget Sound, which is not visible from annual average temperature alone.
For qualification planning, Seattle is a contrast case to Houston: both have corrosion relevance, but Seattle is driven by cool wetness and marine chloride rather than hot-humid operation.
Climetry-derived indicators summarize environmental severity. ISO-derived indicators estimate material-related atmospheric corrosivity for metals such as carbon steel, zinc, copper and aluminum.
Persistent humidity with strong Puget Sound chloride context.
Pacific Northwest chloride layer indicates strong marine screening exposure at Seattle.
Cool humid periods and limited drying potential can support surface wetness.
CEY10 long moisture exposure window for outdoor and semi-outdoor products.
CEY10 high-humidity periods occur mainly in cool wet seasons and nights.
Cool seasonal climate with maritime wetness and chloride modifier.
Monthly mean values of the core thermodynamic variables. Only the monthly means are shown, without a spread or range.
The source and period of these monthly means are not documented on this page yet; they are not presented as CEY10 output.
Cool-season humidity and wetness dominate the Seattle exposure profile.
Thermal stress is moderate and seasonal; heat is not the primary reliability driver.
Absolute humidity is lower than tropical sites but drying potential is limited in wet seasons.
Dew point remains close enough to air temperature for condensation screening in cool periods.
These figures are calculated from the local hourly Climetry Environmental Year and translate thermodynamic climate data into engineering-readable duration, cycle and moisture-risk views.
Seattle's 1 C temperature-duration histogram is calculated from the selected hourly CEY10 source months. It shows how long products experience each outdoor temperature band during the representative year.
The RH duration histogram translates relative humidity into annual exposure hours. It supports moisture-sensitive electronics, coating, connector and enclosure screening.
The joint duration heatmap shows which temperature and humidity combinations occur together. This is more useful for durability screening than separate annual averages.
The psychrometric density view connects dry-bulb temperature with absolute humidity and helps identify moisture-rich operating conditions and drying limitations.
The percentile profile summarizes the representative spread of temperature, dew point, relative humidity, absolute humidity and dew-point margin.
The selected high-risk week highlights periods with elevated humidity, absolute humidity and small dew-point spread. It is a screening view for condensation and moisture-ingress relevance.
Daily temperature-cycle statistics provide engineering input for thermomechanical reliability assessments, enclosure breathing and gasket stress screening.
The cold-week temperature histogram is useful for heating-load screening in temperate and cold climates. In tropical climates it confirms low heating-design relevance.
CE classes summarize humidity, condensation potential, marine influence, pollution context and thermal exposure. They are not ISO 9223 corrosivity classes.
It is useful for identifying persistent moisture exposure relevant to electronics, coatings, connectors, enclosures and atmospheric corrosion screening.
It is derived from temperature, dew point and humidity context. It is a screening indicator, not a measurement on a specific product surface.
Seattle chloride is sampled from the current Climetry North America V2 land-only total chloride overlay. ISO-9223-style screening uses CAMS background SO2 Pc/Pd; MERRA-2 sulfate remains a separate regional context layer.
Annual mean sampled at Seattle from the current North America V2 land-only total chloride overlay.
North America V2 combines NADP-calibrated marine wet deposition, dry-deposition uplift and a coastal aerosol tail. The open-fetch classifier damps sheltered Puget Sound relative to exposed Pacific coastline.
Seattle's sampled grid cell is immediately marine-influenced in the Puget Sound corridor.
Annual wet+dry sulfate deposition background sampled from MERRA-2.
MERRA-2 sulfate remains regional context, not ISO Pd. Live screening uses CAMS background SO2 Pc/Pd and does not resolve local plumes.
Approximate screening inputs: time of wetness, V2 total chloride and CAMS-derived SO2 Pd. MERRA-2 sulfate remains separate context.
Cool wetness plus moderate V2 chloride produce a corrosion-screening context.
Chloride-sensitive aluminum interpretation should use the V2 total chloride value and site-specific shielding.
For Seattle, persistent wetness and Puget Sound chloride context dominate over heat exposure.
Monthly chloride values are sampled from the current North America V2 total chloride overlay at the Seattle grid cell. Sulfate values are sampled from MERRA-2 2020-2024 monthly wet+dry deposition background.
Monthly V2 total chloride estimates remain in the S1 screening range. The updated open-fetch model avoids treating sheltered Puget Sound shoreline as exposed surf coast.
MERRA-2 sulfate background is low to moderate for Seattle; chloride and wetness remain the stronger corrosion-screening drivers.
Seattle shows strong seasonality. Winter UV exposure is low, while summer reaches high enough levels for polymer photo-oxidation screening.
ERA5 2015-2024 monthly climatology sampled at the city grid cell.
Highest monthly mean daily UV dose in the representative climatology.
CAMS EAC4 surface ozone climatology for elastomer and rubber ageing context.
Partial Climetry v0.1 screening index from UV and ozone only; not a lifetime prediction.
Plastic ageing in Seattle is seasonally concentrated rather than year-round severe. For outdoor enclosures, the polymer story should be combined with cool wetness, chloride and limited drying potential.
Monthly profiles show UV surface dose, surface ozone and a partial Plastic Ageing Exposure Index. Thermal oxidation, hydrolysis and moisture ageing will be refined with CEY thermodynamic channels.
Mean daily UV surface dose by calendar month. Useful for photo-oxidation screening of plastics, coatings, cable jackets and exposed polymer housings.
Monthly surface ozone climatology. Relevant for ozone-sensitive elastomers, seals, rubber parts and strained polymer components.
Partial Climetry Plastic Ageing Exposure Index v0.1 from UV and ozone channels only. Thermal and moisture ageing channels will be added from CEY.
Exposure hours (RH80/RH90) and the hourly CEY engineering figures (duration, histogram and percentile diagrams) on this page come from the CEY10 representative year: real months selected from ERA5-Land 2015-2024 at one 0.25° grid cell. The monthly profile charts state their own data basis above them.
The station comparison below is a separate 2025 pilot. It compares monthly values of ERA5, the global reanalysis rather than ERA5-Land, at the nearest grid point with Meteostat airport observations: 12 monthly values per station. It does not validate the representative year, its exposure hours, CE classes or corrosion screening.
For some coastal cities, including Dubai, Mumbai, Seattle and Singapore, the representative-year exposure hours lie outside the annual range observed at the airport station. Broader station comparisons of ERA5-Land and CEY10 are described on the scientific validation page.
No station comparison is available for Seattle in the 2025 pilot, so no agreement figures are shown.
The full report combines climate classification, corrosion screening, condensation exposure, RH80/RH90 hours, marine context, monthly profiles, and reliability implications.
High humidity and condensation exposure may result in a severe Climetry Exposure Class even if atmospheric metal corrosivity remains moderate. CE classes indicate environmental severity and qualification relevance, not failure probability.
Analyze any location worldwide and compare humidity, condensation and environmental severity.
CE-3 is a Climetry Exposure Class. It describes overall environmental severity for durability screening and qualification support at this location.
No. The page provides environmental exposure screening. Corrosion indicators are engineering screening outputs, not failure probability and not a product-specific lifetime prediction.
Exposure hours and the hourly CEY engineering figures (duration, histogram and percentile diagrams) come from the CEY10 representative year: real months selected from ERA5-Land 2015-2024 at one 0.25° grid cell. A separate 2025 pilot compared ERA5 monthly values with airport observations (12 monthly values per station); it does not validate the representative year or its exposure hours. For some coastal cities the representative-year exposure hours lie outside the range observed at the airport. The monthly profile charts state their own data basis above them. Treat the values as screening values.
CE classes describe overall environmental severity. ISO 9223 corrosivity classes describe material-related atmospheric corrosivity categories. They are related but not equivalent.
Temperature, dew point and pressure from ERA5-Land, assembled into the CEY10 representative year (2015-2024), are used to derive relative humidity, absolute humidity and exposure hours. Other layers name their own source and period where they are shown.