24 hours (constant day) 23 hours 18 hours 16 hours 14 hours 12 hours 10 hours 8 hours 6 hours 1 hour 0 hours (constant night) 23 18 16 14 12 10 8 6 1 23 18 16 14 12 10 8 6 1 Day of non-leap year 90° N 80° N 70° N 60° N 50° N 40° N 30° N 20° N 10° N 0° 10° S 20° S 30° S 40° S 50° S 60° S 70° S 80° S 90° S 40° N Vernal (North) / Autumnal (South) equinox Summer (North) / Winter (South) solstice Autumnal (North) / Vernal (South) equinox Winter (North) / Summer (South) solstice Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Page 1 of 1 Hours of daylight vs latitude vs day of year