WeatherArb calculates Z-Score, HDD and CDD against the NASA POWER 25-year baseline for London (51.51°N, -0.13°E). EN ISO 15927 standard.
Cos'è lo Z-Score climatico?
Misura quante deviazioni standard la temperatura attuale di London si allontana dalla media storica dello stesso mese. Sopra +2σ indica caldo anomalo raro; sotto -2σ indica freddo anomalo.
Cosa sono HDD e CDD?
Heating e Cooling Degree Days, standard EN ISO 15927, misurano la domanda energetica per riscaldamento/raffrescamento confrontando la temperatura con una soglia di 18°C.
Con quale frequenza si aggiornano i dati di London?
WeatherArb aggiorna i dati meteo di London ogni ora tramite MET Norway, NOAA NWS e WeatherAPI.
Weather London Today — Temperature and Climate Anomalies
WeatherArb monitors current temperature in London against the NASA POWER 25-year climate baseline. When an extreme heat event, unusual rainfall or cold snap occurs, the Z-Score is automatically updated.
Humidity, wind speed and feels-like temperature in London are updated hourly. During heatwave conditions (July: elevated heat anomaly risk), the anomaly level rises to EXTREME or CRITICAL — a statistically rare climate event.
Seismic Risk London — Low Seismic Risk
London is with low seismic hazard — occasional minor earthquakes occur but major events are rare in this stable tectonic setting. WeatherArb integrates real-time climate anomaly monitoring with USGS seismic data to provide a comprehensive view of natural risk factors affecting agriculture, infrastructure and public safety.
A Changing Climate — London
In the London area, the mean annual temperature has risen by 0.9°C since 2001. Days with highs above 30°C went from an average of 0.9 in 2001–2010 to 2.5 in 2015–2024. The highest recorded value was 34.5°C (2022-07-19).
Methodology: Data comes from the NASA POWER reanalysis (MERRA-2) at roughly 50 km grid resolution: figures describe the surrounding area rather than a single urban station.