How much cloud cover is too much for stargazing? I generally avoid planning any stargazing unless the cloud cover is below 30 percent.
Is there a clear sky app? This app gives you timely information about sky conditions for night sky observations across the United States.
How accurate is clear sky Chart? Based on a numerical weather model, Clear Sky Charts are perhaps the most accurate and the most usable forecasters of astronomical observing conditions for over 6300 observatories and observing sites in North America.
How do you read a clear sky chart? The colors are picked from what color the sky is likely to be, with Dark blue being clear. Lighter shades of blue are increasing cloudiness and white is overcast. This forecast may miss low cloud and afternoon thunderstorms. When the forecast is clear, the sky may still be hazy, if the transparency forecast is poor.