condition-codes

Visibility Distance Fields Are Deceptive: What vis_km Actually Measures and How to Use It Correctly

WeatherAPI Team / September 7, 2026

vis_km in WeatherAPI responses isn’t what most developers assume. Here’s what the field actually represents and how to avoid the common mistakes.

API

How to Detect Fog Programmatically: Using Visibility, Dew Point Spread, and Condition Codes Together

WeatherAPI Team / September 5, 2026

Fog detection via weather API is trickier than it looks. Here’s how to combine visibility, dew point spread, and condition codes reliably in your app.

API

Condition Codes vs. Raw METAR: Why You Should Stop Treating Them as Equivalent

WeatherAPI Team / September 4, 2026

WeatherAPI condition codes are not a direct METAR passthrough. Here’s what the mapping actually does, where it loses fidelity, and when raw data matters.