Daylight Hours Calculator
Calculate total daylight hours for any latitude and date with monthly breakdown.
How It Works
Enter latitude to see daylight hours for today, plus a month-by-month breakdown showing how daylight changes through the year at your location.
Formula
Daylight = 2 x arccos(-tan(lat) x tan(decl)) / 15 hours
Frequently Asked Questions
Which city has the most daylight hours?
Cities near the Arctic Circle like Reykjavik, Iceland or Tromso, Norway can have nearly 24 hours of daylight in summer. Near the equator, daylight is close to 12 hours year-round.
How do daylight hours change with latitude?
At the equator, days are nearly 12 hours year-round. The variation increases with latitude — at 60 degrees north the range is roughly 6-18 hours seasonally.