Hi Richard,

Probably the best way to get the data you require would be to purchase it from the National Weather Service. The most important data you'll need is hourly weather data for temperature, humidity, wind speed and solar radiation, for a period of at least 12 months.

Alternatively, you could synthesise your own weather data by using the nearest city you have weather data for, and then moderate this using monthly averages for Monterrey.

http://www.weatherbase.com/weather/weatherall.php3?s=49367&refer=&units=metric

Of course, this is not as accurate as real weather data, but may be good enough for your needs at this stage.

Please see the converting BOM data forum post for more details on how to do this.

Hope this helps!

Regards,

sid thoo architect ABWA (No. 2142)