WXSIM (Weather Simulator) is a powerful, truly one-of-a-kind tool for forecasting, or just plain studying weather. Its primary purpose is providing accurate, detailed forecasts tailored for your specific location, using a combination of imported real-time and model data (from the internet, plus optionally from your home weather station) and its own internal modeling capabilities. It can even improve its forecasts by learning from past results!
Here are some of the ways WXSIM's hundreds of registered users have employed the program over the last 20+ years:
  • Generating forecasts for a home weather station, using its data.
  • Professional forecasts for clients (i.e. for media, agriculture, electrical energy load forecasting, and wind turbines).
  • Forecasting for recreation (i.e. sailing, soaring, and snow skiing).
  • Education, including teaching forecasting skills.
Here are some of the things that WXSIM can forecast (out to 9 days):
  • Temperature (2 meters above ground, 5 different altitudes above surface, 5 sub-surface depths, at grass surface, plus wind chill factor).
  • Dew point, relative humidity, wet bulb temperature, heat index, and humidex, 2 meters above the surface.
  • Wind speed (and gust strength) and direction 10 meters above the surface, plus wind speed for 2 other heights for wind turbines.
  • Cloud cover and opacity at 5 different heights.
  • Precipitation type and intensity, plus snow depth and ice accumulation (including melting and sublimation).
  • Stability parameters and likelihood of thunderstorms or severe convection.
And much more!

Quick Intro:

Click here to see the Latest News, including an interview with the author, by Tim Vasquez of weathergraphics.com. Download the WXSIM 2017, Build 1.4 demo or upgrade for existing users .

WXSIM runs on any Windows-based computer (at least as far back as XP) and is a free download, with Atlanta, GA and some other sites as demos. It's a clean, compact installation, with all the program and data files in one folder. I, Tom Ehrensperger, have been working on this software for 35 years (yes, really!) and it's my sole creation, though others have helped a lot with data provision and thrid-party scripts for display of WXSIM's output on web pages, plus LOTS of ideas, bug reports, and feature requests over the years. The primary thing you are purchasing if you order it is my time and effort in developing customized data files that enable full, site-specific operation for your exact location. WXSIM is innately a very large, complex system, with a huge array of options, BUT I've streamlined much of this and developed options for the program to run automatically; so, while there's plenty there for the "pros" to play with, it's also accessible for beginners, and everybody in between! Please explore the site via the top navigation bar to learn more about a tool the likes of which you won't see anywhere else!