Clear Sky Chart (Yukon)

MAP

MAP

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How to read this map

This map shows where astronomy-specific weather forecasts, or “clear sky charts”, are available. The colors of the markers indicate amount of light pollution there (colors defined here). You can:

  • Hover over a colored marker to show the chart’s name
  • Click on a maker to display a the smaller version of the chart, and link it to the full version
  • Click and drag on the map to pan.
  • Double click on the map to pan and zoom.
  • Even though this map can be zoomed out to show the all of North America, this page only shows charts in the Yukon.

LOCAL DETAILS

Click on the image for updated information

Click on the image for updated information

This is the local astronomer’s forecast for the next 48 hours in Whitehorse and the surrounding area.  The forecast identifies clear and dark skies for the specific observing site identified above. This information is specifically intended for amateur astronomers. The data comes a forecast model developed by Allan Rahill of the Canadian Meteorological Center.

Read tables from left to right. Locate a column of blue blocks. That’s when the sky will likely to be clear and dark. A more detailed explanation can be found here, but the short version is: the clear sky chart predicts hourly cloud cover, atmospheric transparency and visibility. (Good “visibility” occurs when the air is steady enough to allow you to see fine detail of planets through a telescope.) That means you can plan whether to observe galaxies or planets or stay home and process image data.