Clear Sky Charts

Clear Sky Charts are extremely popular with amateur astronomers.  They are created by Attilla Danko at using data produced by the at the Canadian Meteorological Center. CMC's numerical weather forecasts are unique because they are specifically designed for astronomers. But they have 763 forecast maps, so it can be a chore to find the one you want.  Each Clear Sky Chart, which is based on a specific latitude and longitude, retrieves the colored pixels for that location from the various forecast maps and displays them in a single easy to read chart.  Each row represents a different sky condition and each column represents a different hour of the forecast.  For more information on how to read the charts, click here.

Below are several popular charts used by ASN members.  For a list of all charts within 120 miles of Reno, click here.



Washoe Valley

Carson City / Jack C. Davis Observatory

Truckee / Martis Creek Lake Campground

Fallon / Grimes Point