Weather & Climate

Current conditions from Open-Meteo and historical reanalysis from NASA POWER — two complementary views of Earth’s atmosphere.

Current Conditions (Open-Meteo)

Updated every 10 minutes for 10 major cities across all continents:

• Temperature — 2m above ground, in °C
• Humidity — Relative humidity percentage
• Wind Speed — 10m above ground, in km/h
• Precipitation — Current rainfall in mm
• Weather Code — WMO standard weather classification

Historical Reanalysis (NASA POWER)

Daily data from NASA’s MERRA-2 reanalysis at ~50km global resolution, updated daily with a ~5 day lag:

• Temperature — Daily mean, min, and max at 2m
• Solar Irradiance — All-sky surface shortwave in kWh/m²
• Precipitation — Corrected daily total in mm
• Wind Speed — 10m daily average in m/s
• Humidity — Daily mean relative humidity

NASA POWER data goes back to 1981, making it invaluable for understanding long-term climate trends and detecting anomalies.

Climate Indices

We also track the major ocean-atmosphere oscillations that drive global weather patterns:

• MEI v2 — Multivariate ENSO Index (El Niño/La Niña)
• ONI — Oceanic Niño Index

These indices update monthly and provide crucial context for interpreting weather patterns worldwide.