NWS Official Weather: Daily Climate Reports and Station Observations

Official NOAA / National Weather Service data as clean JSON rows, straight from the government API.

• Daily climate report for any of about 600 US climate stations: the official maximum and minimum temperature with the time each occurred, average temperature, precipitation, snowfall and snow depth, heating and cooling degree days, peak wind and gust, sky cover, humidity, the record and normal values for the date, and the normals for tomorrow. This is the NWS "CLI" Climatological Report (Daily), parsed field by field.
• Station observations: the hourly and special observations for any NWS/ICAO station (temperature, dewpoint, humidity, wind, gust, pressure, visibility, cloud layers, raw METAR), converted to US units.

All data is a US Government work in the public domain. No key, no scraping, no browser.

Who this is for

• Prediction-market and weather-derivative traders who want the official NWS daily high and low, not a third-party estimate, with the preliminary and final report versions kept apart.
• Analysts, dashboards and AI agents that need one clean row per station-day instead of parsing fixed-width government text.
• Anyone who needs recent station observations with the original METAR attached.

Important: exchanges such as Kalshi and Polymarket settle each market on the source named in that market's rules (for many temperature markets that is The Weather Company, not NWS directly). This Actor returns the official NWS data; it does not claim to be the settlement source for any contract. Check the market rules yourself.

Input

Field	Default	Meaning
stations	["KNYC"]	Station ids. Examples: KNYC Central Park, KMDW Chicago Midway, KMIA Miami, KLAX Los Angeles, KDEN Denver, KPHL Philadelphia, KAUS Austin, KSFO San Francisco, KBOS, KATL, KDFW, KSEA.
mode	daily_climate	daily_climate, observations or both.
startDate	yesterday	YYYY-MM-DD, today, yesterday or -N (N days ago).
endDate	same as start	Up to 31 days per run.
timezone	America/New_York	IANA zone used to resolve today / yesterday. Observation day boundaries follow each station's own time zone (from NWS station metadata); this is only the fallback.
reports	latest	latest = newest report per day (final once issued, else the latest preliminary). final = final reports only. all = every issuance.
observationInterval	hourly	hourly = one observation per clock hour. metar = every observation with a raw METAR, including specials. all = every record (5-minute data at ASOS airports, about 300 rows a day).
includeRawText	false	Attach the original report text to each climate row.
cliLocations	none	Override the 3-letter climate location code for a station, e.g. {"PAGS": "GUS"}. K-stations use the last three letters (KNYC = NYC); the main Alaska, Hawaii, Puerto Rico and Pacific airports (PAFA, PANC, PAJN, PABR, PHNL, PHOG, PHTO, PHLI, TJSJ, PGUM, NSTU and others) are built in. Any other non-K station needs an entry here.
maxConcurrency	4	Parallel requests to api.weather.gov (1-8), shared across all stations.

Example: the final report for Chicago Midway and Miami for the last three days.

{
  "stations": ["KMDW", "KMIA"],
  "mode": "daily_climate",
  "startDate": "-3",
  "endDate": "yesterday",
  "reports": "final"
}

Output

One row per station-day (climate) or per observation. Climate row, main fields:

{
  "type": "climate_report",
  "station": "KNYC",
  "cliLocation": "NYC",
  "locationName": "CENTRAL PARK NY",
  "office": "KOKX",
  "date": "2026-09-24",
  "reportType": "final",
  "validAsOfLocal": null,
  "issuedLocal": "233 AM EDT FRI SEP 25 2026",
  "issuedAt": "2026-09-25T06:33:00+00:00",
  "maxTempF": 66,
  "maxTempTime": "15:05",
  "maxTempIsRecord": false,
  "maxTempRecordF": 91,
  "maxTempRecordYears": [2017],
  "maxTempNormalF": 73,
  "maxTempDepartureF": -7,
  "maxTempLastYearF": 80,
  "minTempF": 53,
  "minTempTime": "06:44",
  "minTempRecordF": 40,
  "minTempRecordYears": [1963],
  "minTempNormalF": 60,
  "avgTempF": 60,
  "precipIn": 0,
  "precipTrace": false,
  "precipMonthToDateIn": 2.21,
  "precipYearToDateIn": 33.56,
  "snowIn": 0,
  "snowDepthIn": 0,
  "heatingDegreeDays": 5,
  "coolingDegreeDays": 0,
  "highestWindMph": 17,
  "highestWindDirection": "NE",
  "highestGustMph": 32,
  "avgWindMph": 10,
  "avgSkyCover": 0.4,
  "weatherObserved": [],
  "humidityHighestPct": 74,
  "humidityLowestPct": 42,
  "normals": { "for": "today", "maxNormalF": 73, "maxRecordF": 90, "maxRecordYears": [1970], "minNormalF": 59, "minRecordF": 40, "minRecordYears": [1887] },
  "productId": "d328a89d-29f7-474e-9de8-c96a5ca3cb5e",
  "sourceUrl": "https://api.weather.gov/products/d328a89d-29f7-474e-9de8-c96a5ca3cb5e",
  "source": "NOAA/NWS Climatological Report (Daily, product CLI) via api.weather.gov",
  "licence": "US Government work, public domain",
  "fetchedAt": "2026-09-25T13:02:11.000Z",
  "tables": { "temperature": [], "precipitation": [], "snowfall": [], "heating": [], "cooling": [] }
}

Notes on climate rows:

• reportType is preliminary for the afternoon or early-morning versions ("VALID AS OF ... LOCAL TIME") and final for the full-day report issued after local midnight. validAsOfLocal carries the cut-off time of a preliminary report.
• Times such as maxTempTime are local standard time as printed by NWS, in 24-hour HH:MM.
• precipTrace / snowTrace are true when NWS printed T (a trace); the numeric value is then 0.
• *IsRecord is true when NWS flagged the value with R (record set or tied).
• tables holds every row of the report's fixed-width table (observed, time, record, record years, normal, departure, last year) for precipitation, snowfall and degree days, so nothing is lost.
• Missing values (MM in the report) are null. A day whose max and min are both MM is still returned (NWS says the data is missing), with a note in the log.
• Not every office publishes every column. reportColumns lists the columns that office prints (for example Emporia KS prints no record values, Seattle prints no normals). A field whose column is absent is null. About 84% of stations use the full layout.

Observation row, main fields: station, stationName, stationTimeZone, timestamp (UTC), tempF, tempC, dewpointF, humidityPct, windDirectionDeg, windSpeedMph, windGustMph, pressureInHg, seaLevelPressureMb, visibilityMi, precipLastHourIn, maxTempLast24HoursF, minTempLast24HoursF, heatIndexF, windChillF, cloudLayers, textDescription, rawMetar, sourceUrl.

Limits

• api.weather.gov keeps roughly the last 7 days of climate reports and observations. Older dates return no rows. Schedule the Actor daily if you want to build a history.
• The final climate report for a day is normally issued between about 1 AM and 8 AM local time the next day. Run after that, or use reports: latest to get the preliminary version meanwhile.
• Not every observation station has a climate report. About 600 do; the list is at https://api.weather.gov/products/types/CLI/locations. If a station's report is filed under a code the Actor cannot derive, use cliLocations. You can also pass the 3-letter code itself as the station ("FAI") in daily_climate mode.
• Three Pacific offices (Palau TKR, Chuuk TKK, Tinian T11) publish a free-form report that is not parsed; they return a warning instead of a row.
• A run that produces no rows fails, with the reason in the status message. Only the Actor start event is charged for such a run.
• A station that fails (unknown id, NWS error) is reported in the log and status message; the other stations still return rows.
• Rows are written in batches per station; the order of stations in the dataset is not guaranteed.
• If a run is stopped (timeout, abort, platform restart), use Resurrect on the run: it continues with the stations that were not finished. After a hard stop, stations finished in the last two seconds before the stop may appear twice.
• NWS asks for modest request rates. Keep maxConcurrency low for large station lists.
• Airport ASOS stations report every 5 minutes; the default observationInterval: hourly keeps one record per hour so a day is about 24 rows, not 300.

Pricing

Pay per event. You are charged for each climate report row and each observation row actually written to the dataset, plus the standard Actor start event. A run that returns no rows fails and charges only the start event. See the Pricing tab for current rates.

Data source and licence

Data is produced by the US National Weather Service and retrieved from https://api.weather.gov. NWS states that its information "is in the public domain and may be used without charge for any lawful purpose". This Actor is not affiliated with or endorsed by NOAA or the NWS; it only names them as the source of the unaltered data. Each row carries source, sourceUrl and licence so you can cite it.

Support

Open an issue in the Issues tab with the run id and the station and date you asked for. Parsing problems on an unusual report are usually fixed within a day.