Boulder Airport Sun forecast calculated mathematically.Boulder Airport Sun Times Statistics
Daylight Hours
Solar Events
Autumnal Equinox Day/Night Nearly Equal
22 September, 2024Spring Equinox Day/Night Nearly Equal
20 March, 2025Winter Solstice Shortest Day
21 December, 2024Summer Solstice Longest Day
20 June, 2024Next Partial Solar Eclipse
14 January, 2029 8:27–11:16 amNext Total Solar Eclipse
–Next Annular Solar Eclipse Ring of Fire
10 March, 2100 5:11–5:15 pm