Beteljuice's Zambretti Algorithm Based Forecaster

Enter Data
Environment: Hemisphere:   Local 'Weather Range':   Low:  High:
Current Variables: Wind Direction:   Month:
Barometric Pressure Adjusted to Sea Level: (hPa / mb):    Trend:
12 Hour Forecast:     Your forecast will appear here
Most accurate at 09:00 local time

This page is a Javascript version of the 1915 Negretti and Zambra (Zambretti) weather forecaster which was originally designed for the Northern Hemisphere and UK 'Weather Range'. The algorithm has been re-written to allow for any location worldwide and the choice of 'Wind Direction' has been increased to 16 points to give greater precision.

A forecast made at approximately 09:00 local time is reportedly better than 90% accurate, even though it takes no account of rate of barometer change, wind speed or temperature! The current data required to obtain the forecast for Whitby is contained in the observation below: