Sunrise and sunset times > Boulder
Key sun stats
This table shows the most important sun facts for Boulder. By sun hrs lost we mean the number of hours that the sun is shaded by the terrain. Hover over each row for more info.
|Average cloud cover||51 %|
|Average sun hours per day||11:34|
|Avg PM sun hrs lost||00:40|
|Avg AM sun hrs lost||00:08|
An index value of 100 percent means that there is no terrain shading. If the index is 50 percent, the terrain blocks the sun half the time. You'll find the sun index values for each month further down on the page.