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Weather and climate · by NOAA National Centers for Environmental Information (NCEI)

NOAA NCEI Climate Data Online and Access Data Service

NOAA's archive of historical weather and climate observations, including daily station records (GHCN-Daily) from over 90,000 land stations, with a key-less data service API, a token-based CDO API and bulk file downloads.

You can pull more than a century of daily highs, lows and rainfall for a single weather station with one URL and see how a place's climate has shifted.

LiveAPI, no keyDownloadCommercial: conditions

Open ncei.noaa.gov/cdo-web ↗ agent.md

For your project

Official API
Official API · Free Access Data Service: no key needed (tested). Older CDO Web Services v2 (https://www.ncei.noaa.gov/cdo-web/api/v2/) needs a free token, limited to five requests per second and 10,000 requests per day
“The NCEI Access Data Service queries use HTTP 1.1 GET request and the endpoint is located off the base URL at .../access/services/data/v1 .” ncei.noaa.gov/support/access-data-service-api-use...
Key
Not needed
“An access token is required to use the API, and each token will be limited to five requests per second and 10,000 requests per day.” ncdc.noaa.gov/cdo-web/webservices/v2
Formats
CSV, JSON, SSV, PDF, NETCDF
Data download
Yes csv, text
“These data include quality controlled daily, monthly, seasonal, and yearly measurements of temperature, precipitation, wind, and degree days as well as radar data and 30-year Climate Normals.” ncei.noaa.gov/cdo-web/
License
public domain (US); WMO Resolution 40 limits on some non-US station data NOAA-produced environmental data are US public domain; GHCN data for non-US locations exchanged under WMO Resolution 40 may not be re-exported for commercial services; datasets ask to be cited
Commercial use
Commercial use with conditions
“For non-U.S. locations data, the data or any derived product shall not be provided to other users or be used for the re-export of commercial services.” ncei.noaa.gov/pub/data/cdo/documentation/GHCND_do...
Credit
Credit required
“Use Constraints Cite as: Menne, Matthew J., Imke Durre, Bryant Korzeniewski, Shelley McNeill, Kristy Thomas, Xungang Yin, Steven Anthony, Ron Ray, Russell S. Vose, Byron E.Gleason, and Tamara G. Houston (2012)” ncei.noaa.gov/metadata/geoportal/rest/metadata/it...
Embedding
Can be embedded
“These data are in the public domain in the United States.” ncei.noaa.gov/sites/default/files/2023-12/NCEI%20...
Using the website
Free

Read on NOAA NCEI Climate Data Online and Access Data Service's own pages on Oct 23, 2026 · license or terms · API docs. Check the license page before you ship.

For your agent

A request your code or agent can make with no key:

https://www.ncei.noaa.gov/access/services/data/v1?dataset=daily-summaries&stations=USW00094728&startDate=2024-01-01&endDate=2024-01-07&dataTypes=TMAX,TMIN,PRCP&format=json
  • Prefer the key-less Access Data Service (/access/services/data/v1?dataset=daily-summaries&stations=...&format=json); use GHCN station IDs like USW00094728 (New York Central Park); the token-based cdo-web/api/v2 is only needed for its search endpoints.
  • Cite NOAA NCEI and the dataset (e.g. GHCN-Daily, Menne et al. 2012) where the data is used.
  • For commercial products, stick to US station data or check the WMO Resolution 40 note: non-US GHCN data may not be re-exported for commercial services.
  • The cdo-web/api/v2 token is limited to 5 requests/second and 10,000/day; keep Access Data Service requests to reasonable date ranges.

Paste into your agent: Read https://agentgid.com/resources/noaa-ncei-climate-data-online/agent.md before using NOAA NCEI Climate Data Online and Access Data Service.

What you can build

  • A 'how hot was your birthday' page that pulls TMAX/TMIN for a nearby US station on every birthday since birth.
  • A climate-shift chart for a local news site comparing each decade's average summer highs at one station since the record began.
  • A degree-day calculator for US farms or HVAC contractors using daily-summaries for the nearest station.

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