Iowa Environmental Mesonet (IEM) web services and API
Iowa Environmental Mesonet (IEM) web services and API
Iowa State University's Iowa Environmental Mesonet serves current and archived weather observations, NWS warnings archives and radar products through a family of JSON/CSV web services and a FastAPI-based API v1. The API page says: "The primary goal of this website is to make data freely available in an open manner."
Required Attribution:
Not required; "Attributing the Iowa Environmental Mesonet of Iowa State University would be appreciated."
Coverage
ASOS/AWOS airports and other mesonet networks' current and archived observations, NWS text products (CF6, CLI, Local Storm Reports, Special Weather Statements, VTEC events, watches/warnings), radar/satellite-derived products, soundings and more, through a formal FastAPI (JSON Table Schema), ad-hoc (Geo)JSON services, bulk CGI download services and OGC services. Update cadence: Not stated as one figure.
Verdict
Current and archived weather observations (ASOS/AWOS airports, mesonets), NWS warnings archives and radar products for the US via JSON/CSV web services from Iowa State University. Licence recorded as Custom (public domain): the disclaimer page says "The materials found on this website are in the public domain and may be used freely by anyone for any lawful purpose. Attributing the Iowa Environmental Mesonet of Iowa State University would be appreciated." Commercial use is explicitly allowed: "You are free to use these services for any lawful purpose (including commercial whereby your company makes lots of money using these)". Distinct from the live nws-api and aviationweather-data-api entries (different provider and archive scope). Rate limits: not stated numerically. Signal Lab links only.
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