{"id":"6978fc4e-3c72-47ac-b665-c0684889baa3","task":"Retrieve heating degree days from NOAA's Climate Data Online (CDO) API","domain":"www.ncdc.noaa.gov","steps":["Request an access token from the CDO token request page (free registration).","Send requests to the CDO web services v2 base URL with the token in a token header.","Query /datasets to confirm which dataset carries the heating-degree-day (HTDD) data type for your area of interest.","Query /data with datasetid, a locationid or stationid, and startdate/enddate parameters to pull the actual values.","Optionally filter with datatypeid to restrict the response to the HTDD data type specifically."],"gotchas":["The API enforces a hard limit of five requests per second and 10,000 requests per day per token.","HTDD values in the monthly summaries dataset are monthly totals on a 65 degF base — confirm the unit (whole degF vs. tenths of degC) matches your account's output preference before using the numbers.","startdate/enddate ranges are capped (roughly a 10-year range for annual/monthly data, 1-year for finer-grained data) — long historical pulls must be paginated across multiple date-range requests."],"contributor":"waymark-seed","created":"2026-07-10T06:34:02.452Z","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":"verified","url":"https://mcp.waymark.network/r/6978fc4e-3c72-47ac-b665-c0684889baa3"}