Seattle represents a cool maritime environment where persistent wetness, Puget Sound chloride exposure and urban-industrial SOx context matter more than heat.
Analyze SeattleMarine 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.
Preview profiles show monthly min-max envelopes, P10-P90 percentile bands, and monthly means for the core thermodynamic variables.
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 values are sampled from the Climetry Pacific Northwest 1.5 km atmospheric transport overlays using 32 wind sectors and corrected diffusion. Chloride is locally calibrated against NADP stations; SOx is rank-valid but magnitude-uncalibrated.
Annual mean sampled at Seattle from the Pacific Northwest 1.5 km atmospheric transport grid with 32 wind sectors.
Pacific Northwest chloride calibration: calibration R2=0.685, rho=0.657, p=0.0030, n=18 against NADP wet-deposition stations.
Seattle's sampled grid cell is immediately marine-influenced in the Puget Sound corridor.
Sampled at Seattle from the Pacific Northwest SOx transport screening grid with 32 wind sectors.
EPA AirData comparison shows a real rank signal (rho=0.758, p=0.011, n=10), but magnitude fit does not generalize and remains uncalibrated.
Approximate ISO 9223-style input categories: time of wetness, chloride deposition and sulphur pollution screening input.
ISO-derived screening indicator: cool wetness plus marine chloride create a high corrosion-screening context.
ISO-derived screening indicator: chloride-sensitive but lower thermal acceleration than hot coastal sites.
For Seattle, persistent wetness and Puget Sound chloride context dominate over heat exposure.
Monthly profiles are derived from the Pacific Northwest 2015-2024 atmospheric transport model at the Seattle grid cell. Chloride is calibrated with a meaningful regional signal; SOx remains an uncalibrated source-context screening index.
Monthly chloride screening estimates are normalized to the same annual grid-cell mean shown above. Seattle shows strong maritime chloride exposure with winter and spring peaks.
The SOx screening index is high at Seattle and rank-valid at regional scale, but absolute magnitude is not calibrated.
The environmental indicators presented on this page are derived from ERA5 climate data.
ERA5 thermodynamic variables have been compared against long-term airport weather station observations across multiple climate regions.
The comparison demonstrates good agreement between ERA5 and measured environmental conditions.
These comparisons evaluate long-term environmental representativeness and not individual weather events.
Monthly thermodynamic comparison against Seattle-Tacoma International Airport (KSEA) weather observations for 2025.
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.
The indicators are derived from ERA5 climate data. ERA5 thermodynamic variables have been compared against representative airport weather observations and show good monthly agreement for temperature, dew point and relative humidity.
CE classes describe overall environmental severity. ISO 9223 corrosivity classes describe material-related atmospheric corrosivity categories. They are related but not equivalent.
Climetry uses ERA5 temperature, dew point and pressure fields to derive relative humidity, absolute humidity and environmental exposure indicators for engineering interpretation.
