# NCEI Climate Data Online (CDO) v2 API

**Canonical:** https://apis.io/apis/noaa-gov/ncei-cdo-v2-api/  
**Provider:** NOAA — National Oceanic and Atmospheric Administration — https://apis.io/providers/noaa-gov/  
**Base URL:** https://www.ncei.noaa.gov/cdo-web/api/v2  
**Documentation:** https://www.ncdc.noaa.gov/cdo-web/webservices/v2

NCEI Climate Data Online (CDO) v2 API is one of 24 APIs that [NOAA — National Oceanic and Atmospheric Administration](https://apis.io/providers/noaa-gov/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Climate, Historical, Stations, and Datasets. The published artifact set on APIs.io includes API documentation, authentication docs, and rate-limit docs.

The legacy Climate Data Online v2 REST API exposes datasets, datatypes, stations, locations, data categories, and observation records. Requires a free token from ncei.noaa.gov/cdo-web/token in the `token` header. Enforces 5 requests/second and 10,000 requests/day per token. Being superseded by the Access Data Service v1, but still widely deployed.

## Machine-readable artifacts (3)

- **Documentation** — https://www.ncdc.noaa.gov/cdo-web/webservices/v2
- **Authentication** — https://www.ncdc.noaa.gov/cdo-web/token
- **RateLimits** — https://raw.githubusercontent.com/api-evangelist/noaa-gov/refs/heads/main/rate-limits/noaa-gov-rate-limits.yml

## Other NOAA — National Oceanic and Atmospheric Administration APIs (12)

- [Space Weather Prediction Center (SWPC) Data Service](https://apis.io/apis/noaa-gov/swpc-data-service/)
- [CO-OPS Data Retrieval API (Tides & Currents)](https://apis.io/apis/noaa-gov/co-ops-data-api/)
- [CO-OPS Metadata API (MDAPI v1)](https://apis.io/apis/noaa-gov/co-ops-metadata-api/)
- [CO-OPS Derived Product API (DPAPI v0.1)](https://apis.io/apis/noaa-gov/co-ops-derived-product-api/)
- [NCEI Access Data Service (v1)](https://apis.io/apis/noaa-gov/ncei-access-data-service/)
- [National Data Buoy Center (NDBC) Web Data Service](https://apis.io/apis/noaa-gov/ndbc-data-service/)
- [NOAA CoastWatch ERDDAP Server](https://apis.io/apis/noaa-gov/erddap-coastwatch/)
- [NOAA Open Data Dissemination (NODD)](https://apis.io/apis/noaa-gov/nodd-open-data/)
- [NOAA Fisheries One Stop Shop (FOSS) ODS / ORDS](https://apis.io/apis/noaa-gov/foss-landings-api/)
- [NOAA InPort Metadata Catalog](https://apis.io/apis/noaa-gov/inport-metadata-api/)
- [NOAA — National Oceanic and Atmospheric Administration Alerts API](https://apis.io/apis/noaa-gov/noaa-gov-alerts-api/)
- [NOAA — National Oceanic and Atmospheric Administration Aviation API](https://apis.io/apis/noaa-gov/noaa-gov-aviation-api/)

## Tags

Climate, Historical, Stations, Datasets

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/noaa-gov/ncei-cdo-v2-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/noaa-gov/.