London is a temperate maritime deployment environment where mild temperatures, persistent humidity, estuary influence and urban atmospheric context can affect outdoor products.
Marine-influenced humidity is the primary stressor. Urban sulfate context 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.
London is not a tropical or desert environment, but it is relevant for engineering because mild maritime climates can produce long wetness periods and limited drying potential.
The UK South East / Thames atmospheric layer adds estuary and coastal transport context that is not visible from annual average temperature alone.
For qualification planning, London is useful as a temperate-maritime corrosion and humidity reference between inland Central Europe and severe marine tropical locations.
Climetry-derived indicators summarize environmental severity. ISO-derived indicators estimate material-related atmospheric corrosivity for metals such as carbon steel, zinc, copper and aluminum.
Moderate temperatures with persistent humidity and urban atmospheric context.
The current v2.3 layer places London in S1 chloride screening, with persistent wetness and sulfate background still relevant.
Cool humid periods and shoulder seasons can support wetness and surface moisture.
CEY10 meaningful moisture exposure window for outdoor and semi-outdoor equipment.
CEY10 high-humidity periods occur mainly in cooler seasons and nights.
Mild seasonal climate with marine and urban modifiers.
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.
Humidity remains meaningful through much of the year, especially in cool seasons.
Mild temperatures reduce heat stress but support long wetness periods.
Absolute humidity is moderate, with summer peaks and winter drying limitations.
Dew point stays 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.
London'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.
London chloride is sampled from the monthly Europe/Mediterranean v2.3 coastal receptor-grid total chloride layer. ISO-9223-style screening uses CAMS background SO2 Pc/Pd; MERRA-2 sulfate is reported independently as regional context.
Monthly Europe/Mediterranean v2.3 receptor-grid values range from 14.6 to 55.3 mg/m2/day at London; the 12-month mean reconstructs the annual v2.3 value.
Europe/Mediterranean v2.3 combines MERRA-2 constrained background, EBAS/EMEP wet-deposition calibration and an EFC/Bulk-calibrated coastal receptor-grid correction. London is 35.5km from the coast; a freshwater/river false-positive found during development was fixed, leaving a conservative estuary-linked S1 signal.
London is far enough inland for local effects to matter, but close enough for marine-influenced transport screening to remain relevant.
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; experimental transport remains research-only.
Approximate screening inputs: time of wetness, V2 total chloride and CAMS-derived SO2 Pd. MERRA-2 sulfate remains separate context.
Wet hours, chloride screening, and CAMS background SO2 jointly define the corrosion context.
Uses CAMS background SO2 Pd; no certified ISO site classification is claimed.
Screening-level atmospheric corrosivity context, not product-specific lifetime prediction.
Sensitive to chloride and local shielding; the city-cell chloride value represents broad estuary/coastal aerosol context, not direct splash exposure.
For London, humidity, estuary/coastal transport, and CAMS background SO2 jointly drive the screening context.
Monthly chloride values below use the v2.3 monthly extension: the validated annual receptor-grid field is distributed by local monthly marine-source seasonality. Sulfate values are sampled from MERRA-2 2020-2024 monthly wet+dry deposition background.
Monthly v2.3 chloride shows a winter-enhanced S1 marine-estuary signal, peaking in January and December and dropping in early summer. Direct surf/splash exposure and local shielding are not represented by the city grid cell.
MERRA-2 sulfate background is moderate for London and provides independent regional deposition context; it is not the ISO Pd input.
London's plastic-ageing exposure is seasonal and temperate-maritime: summer UV dominates while ozone remains moderate.
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.
For UK outdoor products, polymer degradation screening should focus on seasonal UV exposure, wetting/drying behavior and ozone-sensitive elastomers rather than continuous desert-style UV load.
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 London 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.