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Weather Station Core

Turn any personal weather station into a complete weather intelligence system.

Weather Station Core (ws_core) is a Home Assistant custom integration that reads raw sensor data from any HA-integrated weather station and derives 150+ meteorological values through a guided setup flow.

What it does

You provide 7 sensor entities — temperature, humidity, pressure, wind speed, wind gust, wind direction, cumulative rainfall. ws_core does the rest.

Capabilities not available in any other HA weather integration

  • Precipitation nowcast with minutes-until-rain precision (sensor.ws_minutes_until_rain)
  • UTCI (Universal Thermal Climate Index, full Bröde 2012 polynomial)
  • Three fire danger systems: Canadian FWI, McArthur FFDI (Australia), Fosberg FFWI (US/global)
  • Zambretti barometric forecast — fully local, no network call, no API
  • Penman-Monteith ET₀ for irrigation scheduling (Smart Irrigation compatible)
  • 8 upload targets in one integration (WU, Weathercloud, WOW, CWOP, and more)
  • 8 translations at full entity-name parity

Always-on (core features, no API key required)

What How
Zambretti forecast From your station's pressure + wind data
36-condition classifier From illuminance, rain rate, temperature, wind
Wet-bulb, frost point Stull (2011), Buck (1981)
Pressure trend WMO No. 306 least-squares regression
Kalman-filtered rain rate De-noised tipping-bucket readings
ET₀ (Hargreaves-Samani) No solar radiation sensor required
Moon phase and illumination Meeus (1998) astronomical algorithms
Adaptive rain probability 90-day Brier-score blended local + NWP
Streak counters Dry days, heat days, frost days

Optional feature groups

Group What it adds
Comfort Indices Heat Index, Wind Chill, Humidex, UTCI, WBGT, VPD, Delta-T, THW, THSW, chill hours, clearness index, cloud cover
Precipitation Nowcast ws_minutes_until_rain, ws_minutes_until_dry, ws_rain_next_60min, ws_rain_expected_1h
Fire Risk FWI, FFDI, FFWI, fire risk score (1-10)
Lightning Detection Strike count, distance, rate, clearance countdown, proximity state
Indoor Sensors Indoor temp/humidity/CO₂, deltas, comfort score, per-room deltas
Degree Days HDD, CDD, GDD, leaf wetness
Air Quality AQI, NO₂, ozone (Open-Meteo, free)
Network Uploads WU, Weathercloud, PWSWeather, WOW, AWEKAS, CWOP, OWM Stations, Windy
MQTT Discovery 70+ sensors as MQTT Discovery payloads
Station Diagnostics Drift detection, spike flags, spatial QC, data-quality score

Getting started

See the Quickstart for a 5-minute installation walkthrough.

Project status