World Clock Deluxe can display weather reports using both US and metric units.
On macOS 13 or later, choose World Clock Deluxe > Settings. On macOS 12 or earlier, choose World Clock Deluxe > Preferences. Then click Weather.
Choose a temperature unit from the "Temperature unit" pop-up menu. Temperature can be expressed in degrees Fahrenheit (°F) or Celsius (°C).
Choose a pressure unit from the "Pressure unit" pop-up menu. Atmospheric pressure can be expressed in inches of mercury (inHg) or hectopascals (hPa).
Choose a visibility unit from the "Visibility unit" pop-up menu. Visibility can be expressed in miles or kilometers (km).
Choose a wind speed unit from the "Wind speed unit" pop-up menu. Wind speed can be expressed in knots, miles per hour (mph), kilometers per hour (km/h) or meters per second (m/s).
You can change units at any time, including while retrieving weather reports: World Clock Deluxe updates all the reports listed in the Weather Reports window.