Fog Calculator
Calculate fog probability and visibility conditions
Understanding Fog Formation
Fog forms when the difference between air temperature and dew point is minimal, typically accompanied by high relative humidity. Understanding these conditions helps predict fog formation and its potential impact on visibility.
How to Use the Calculator
- Enter the current air temperature
- Input the dew point temperature
- Specify the relative humidity percentage
- Enter the current wind speed
- Select your preferred unit system
Understanding Results
The calculator provides:
- Fog probability percentage
- Expected visibility range
- Condition analysis
- Formation and dissipation timing
Key Concepts
- Temperature-Dew Point Spread
- Smaller spread increases fog likelihood
- Relative Humidity
- Higher humidity (>90%) favors fog formation
- Wind Speed
- Light winds (<5 mph) often ideal for fog development