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.

Latest sunset 20:03
Earliest sunrise 05:35
Latest sunrise 07:41
Earliest sunset 15:46
Average cloud cover 51 %
Average sun hours per day 11:35
Avg PM sun hrs lost 00:40
Avg AM sun hrs lost 00:08

Sun indexes

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.

Total 93 %
Morning 98 %
Afternoon 90 %
Winter 89 %
Spring 95 %
Summer 95 %
Autumn 92 %

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Map

Formatted Address
Time Zone
Latitude
Longitude
Height above ground

Month by month




Period Total (%) Morning (%) Afternoon (%) Sun hours Daily average sun time
Overall 93 98 90 4228 11:35
January 89 96 83 273 08:48
February 91 97 85 285 10:11
March 95 98 92 357 11:31
April 95 98 93 385 12:50
May 96 98 94 433 13:58
June 95 98 93 432 14:24
July 96 98 94 439 14:10
August 95 98 93 410 13:14
September 95 98 93 360 12:00
October 92 97 87 320 10:19
November 90 97 83 273 09:06
December 89 96 81 262 08:27
Winter 89 96 83 821 09:07
Spring 95 98 93 1175 12:46
Summer 95 98 93 1281 13:55
Autumn 92 97 88 952 10:28

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Date Weekday Sunrise Sunset
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