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API · /weathercalc-api

Weather Calculator API

healthy 4,194 Subscribers

Meteorological formulas as an API — the derived weather figures, computed from your own readings, with no data feed or key needed. The wind-chill endpoint gives the "feels like" cold using the Environment Canada formula in metric (°C, km/h) or the US NWS formula in imperial (°F, mph), and flags when the reading is outside the valid range. The heat-index endpoint gives the apparent temperature from heat and humidity using the NWS Rothfusz regression with the standard low- and high-humidity adjustments. The dew-point endpoint uses the Magnus formula to turn temperature and relative humidity into the dew point, and also returns the vapour pressure and the absolute humidity. The beaufort endpoint maps a wind speed (m/s, km/h, mph or knots) to its Beaufort force and description, or a force back to its speed range. Everything is computed locally and deterministically, so it is instant and private. Ideal for weather apps and dashboards, agriculture and HVAC, marine and aviation, and outdoor and safety tools. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 5 endpoints. This computes weather formulas from your own readings; for live forecasts and observations use a weather data API.

#weather #wind-chill #heat-index #dew-point #meteorology #developer-tools
api.oanor.com/weathercalc-api
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Machine-readable spec so AI agents can integrate this API.

/api/weathercalc-api/openapi.json
/api/weathercalc-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
85 ms
Server probes · 24h
Subscribers
4,194
active
Total calls
55
last 7 days
status Full status page → · 30 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 6,835 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 6,835 calls/month
  • 2 req/sec
  • Wind chill / heat index / dew point / Beaufort
  • No credit card
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Starter

€8.35 /month

  • 16,350 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 16.35k calls/month
  • 8 req/sec
  • Metric + imperial
  • Email support
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Pro

€28.25 /month

  • 214,500 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 214.5k calls/month
  • 20 req/sec
  • Weather / HVAC / marine pipelines
  • Priority support
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Mega

€66.25 /month

  • 1,115,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 1.115M calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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Related APIs

Other APIs with overlapping tags.

Feels-Like Temperature API

Feels-like (apparent) temperature meteorology as an API, computed locally and deterministically. The wind-chill endpoint computes how cold the air feels when wind carries body heat away, using the Environment Canada formula WC = 13.12 + 0.6215·T − 11.37·V^0.16 + 0.3965·T·V^0.16 from the air temperature (°C) and wind speed (km/h), valid at 10 °C or below with wind of at least 4.8 km/h. The heat-index endpoint computes how hot it feels in warm, humid air with the US National Weather Service Rothfusz regression from temperature and relative humidity, since high humidity slows sweat evaporation, with the low-/high-humidity adjustments. The apparent-temperature endpoint computes the Australian Bureau of Meteorology apparent temperature, AT = Ta + 0.33·e − 0.70·ws − 4.00, which combines the warming effect of humidity (through the vapour pressure e) and the cooling effect of wind (ws in m/s) in a single feels-like value. Temperatures are in °C (Fahrenheit also returned), humidity in %, wind in km/h for wind chill and m/s for apparent temperature. Everything is computed locally and deterministically, so it is instant and private. Ideal for weather, outdoor-activity, sports, smart-home and wearable app developers, comfort and safety tools, and meteorology education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is the feels-like temperature calculator; for the occupational WBGT heat-stress index use a WBGT API and for live weather observations a weather data API.

api.oanor.com/feelslike-api

Flood & River Discharge API

Global river-discharge and flood forecasting as an API, powered by the GloFAS (Global Flood Awareness System) model via Open-Meteo. For any coordinate on Earth, get a daily river-discharge forecast of up to 30 days — with the ensemble spread (mean, max and min across forecast members) so you can gauge uncertainty — plus up to 90 days of recent discharge history, and a quick current-situation summary with today's discharge and a 7-day outlook (peak day, max/min and rising/falling/stable trend). Discharge is reported in cubic metres per second. Ideal for flood early-warning and monitoring, insurance and reinsurance risk, agriculture and irrigation planning, hydropower, and environmental research. Data covers modelled rivers worldwide (none over open ocean). Open data via Open-Meteo / GloFAS.

api.oanor.com/flood-api

METAR / TAF Aviation Weather API

Live aviation weather for any airport as an API, relayed from NOAA's Aviation Weather Center. Get the current METAR observation for an ICAO station (e.g. KJFK → New York JFK: temperature, dewpoint, wind, visibility, altimeter, cloud layers, flight category VFR/MVFR/IFR/LIFR and the raw report) or the TAF terminal aerodrome forecast. Query one station or up to 10 at once (KJFK,EGLL,EDDF). Both decoded fields and the raw text are returned. Ideal for flight-planning tools, aviation dashboards, drone/UAV operations and weather apps.

api.oanor.com/metar-api

Climate API

Classify any location's climate with the Köppen-Geiger system — the standard used across geography, ecology, agriculture and architecture. Provide a location's twelve monthly mean temperatures and precipitation totals and get back its climate code (for example Cfb or BWh), the climate group and full name, a description, and a block of derived statistics (annual mean temperature, annual precipitation, warmest and coldest month, driest month, months above 10 °C, summer-precipitation share and the aridity threshold). The hemisphere is auto-detected from the temperature curve, or you can set it explicitly. A reference endpoint returns all thirty Köppen-Geiger codes with names, groups, descriptions and example cities. Every endpoint accepts input via the query string or the request body and returns lean JSON. Pure server-side computation (no third-party upstream), so responses are instant and always available. Ideal for EdTech and geography tools, AgTech and crop-suitability apps, architecture and GIS pipelines.

api.oanor.com/climate-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Weather Calculator API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Weather Calculator API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Weather Calculator API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Weather Calculator API cost?
Weather Calculator API has a free tier with 100 calls / month. Paid plans start at €8.35 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Weather Calculator API GDPR-compliant?
All requests to Weather Calculator API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/weathercalc-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/weathercalc-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/weathercalc-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/weathercalc-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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