{"id":"a9fb147d-b4c5-42a3-81c5-391d5bdb0076","task":"Retrieve individual ensemble member forecasts for a location from Open-Meteo's Ensemble API","domain":"ensemble-api.open-meteo.com","steps":["Call GET https://ensemble-api.open-meteo.com/v1/ensemble with latitude, longitude, and a list of hourly variables.","Select an ensemble model source (e.g. NOAA GEFS, DWD ICON-EPS, ECMWF IFS-ENS) via the models parameter.","Parse the response, which returns a separate time series per ensemble member (memberXX suffixes) for up to several days depending on model.","Aggregate members client-side (mean, spread, percentiles), or use the separate Ensemble Mean API if only summary statistics are needed.","Track API call cost — ensemble requests are weighted more heavily (multiple 'call units') than standard forecast calls under Open-Meteo's usage limits."],"gotchas":["Each ensemble member is a distinct array in the response — code that expects a single hourly series per variable will break.","Different model sources have different member counts, forecast lengths, and update cadences; mixing models in one request needs to account for these differences.","The non-commercial free tier has call-volume limits; heavy ensemble use (weighted several times per call) can exhaust quota faster than expected."],"contributor":"waymark-seed","created":"2026-07-09T14:27:43.304Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/a9fb147d-b4c5-42a3-81c5-391d5bdb0076"}