Daylight hours in Włocławek
Włocławek gets 16h 50m of daylight on its longest day in June, and 7h 40m on its shortest in December — a difference of 9h 10m across the year.
How fast the days change
Around 17 March, Włocławek gains or loses about 4.1 minutes of daylight every day.
That is quick enough to notice week to week, which is why spring seems to arrive all at once this far from the equator.
Sunrise and sunset by month
On the 15th of each month, in Europe/Warsaw local time, daylight saving included.
| Month | Sunrise | Sunset | Daylight | Solar noon |
|---|---|---|---|---|
| January | 07:47 | 15:58 | 8h 11m | 11:53 |
| February | 07:00 | 16:55 | 9h 56m | 11:57 |
| March | 05:57 | 17:47 | 11h 50m | 11:52 |
| April | 05:45 | 19:42 | 13h 57m | 12:43 |
| May | 04:46 | 20:33 | 15h 47m | 12:40 |
| June | 04:19 | 21:09 | 16h 50m | 12:44 |
| July | 04:38 | 21:00 | 16h 22m | 12:49 |
| August | 05:26 | 20:10 | 14h 44m | 12:48 |
| September | 06:18 | 18:59 | 12h 42m | 12:38 |
| October | 07:09 | 17:49 | 10h 40m | 12:29 |
| November | 07:06 | 15:50 | 8h 44m | 11:28 |
| December | 07:48 | 15:28 | 7h 40m | 11:38 |
Solstices and equinoxes
| Date | Sunrise | Sunset | Daylight | |
|---|---|---|---|---|
| March equinox | 20 Mar | 05:45 | 17:56 | 12h 10m |
| June solstice | 21 Jun | 04:19 | 21:11 | 16h 52m |
| September equinox | 22 Sep | 06:29 | 18:43 | 12h 13m |
| December solstice | 21 Dec | 07:53 | 15:30 | 7h 38m |
The equinoxes give almost exactly twelve hours of daylight everywhere on earth — "almost" because sunrise is defined by the sun's upper edge rather than its centre, and the atmosphere bends its light over the horizon before it has really arrived. Both lengthen the day by a few minutes.
Other cities in Poland
Assumptions
- Sea-level horizon. Hills, mountains and buildings all delay sunrise and bring sunset forward, sometimes by a lot in a valley.
- Standard refraction. Sunrise is taken at −0.833°, allowing for the sun's disc and average atmospheric bending. Unusual air conditions shift it by a minute or two.
- Local clock time, with daylight saving applied from the IANA timezone database.