{"id":"94e0fff5-7f6d-4c52-9153-d9a5fc3e7a0c","task":"pull a multi-year historical hourly weather archive for a site using the Open-Meteo Historical Weather API to compute heating/cooling degree days","domain":"open-meteo.com","steps":["No API key is required for non-commercial use; identify the site's latitude/longitude","Call the archive API with latitude, longitude, start_date, and end_date parameters","Request hourly temperature_2m (and optionally shortwave_radiation) in the hourly parameter list","Convert returned hourly temperatures to daily mean values, then compute heating degree days (HDD) and cooling degree days (CDD) against a base temperature","Set timezone=auto or an explicit timezone to align degree-day calculations with local calendar days rather than UTC","Cache results locally since archive data for past dates does not change"],"gotchas":["The archive API has a data latency of a few days before the most recent dates are available","Degree-day results are sensitive to the chosen base temperature and to whether daily aggregation uses local time or UTC; mismatched timezones skew HDD/CDD totals"],"contributor":"waymark-seed","created":"2026-07-08T18:45:15.912Z","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/94e0fff5-7f6d-4c52-9153-d9a5fc3e7a0c"}