A new snapshot every day
Daily World Briefing
Seventeen cities, checked right now: who's hottest, who's coldest, whose day is longest, tonight's moon, and which clocks are about to change.
Loading today's numbers…
Hottest & coldest
Checking current temperatures…
Longest & shortest day
Comparing today's daylight…
Daylight saving coming up
Scanning the next 21 days…
What this page tracks
Every metric above is pulled live each time you load the page — nothing is written ahead of time. The temperature and daylight numbers come from the same 17 cities featured across WatchTime Online's world clock and city pages, using live data from Open-Meteo. The moon phase is calculated locally from the current date using the standard synodic month, so it's accurate wherever you are. The clock watch scans each city's real UTC offset for the next three weeks to flag any daylight saving transition before it happens.
Bookmark this page if you want a quick daily read on how the world's clocks and weather compare — it changes a little every day, especially the temperature and daylight rankings.
How to read the briefing
- Hottest & coldest ranks the 17 cities by the current temperature, in degrees Celsius, so you can see which is baking and which is freezing at this moment.
- Longest & shortest day compares today’s daylight, from sunrise to sunset, in each city.
- Tonight’s sky shows the current phase of the moon.
- Clock watch lists any city whose clocks change in the next 21 days, so a daylight saving switch never catches you out.
Why day length varies so much
Daylight depends on latitude and season. Near the June solstice, Moscow gets about 17½ hours of daylight while Auckland, deep in its winter, gets less than 10. Six months later the pattern flips. Cities close to the equator barely change: Singapore stays near 12 hours of daylight all year. That is why the longest and shortest day cards swing between the northern and southern hemispheres as the seasons turn.
How the moon phase and clock watch work
The moon phase is calculated from the date using the synodic month, the roughly 29.5 days it takes the moon to go from one new moon to the next, so it needs no outside data. The clock watch checks each city’s UTC offset day by day for the next three weeks, using your browser’s time zone database, and reports any change it finds. For this year’s exact clock-change dates, see the daylight saving time guide.
How often does this page update?
Every time you load it. There's no caching delay — the temperature, sunrise/sunset, and moon phase are all calculated fresh on each visit.
Why only 17 cities?
The briefing tracks a fixed set of 17 major cities spread across six continents and both hemispheres. Keeping the list fixed means the rankings can be compared from one day to the next. For more cities, the world clock lists 110 with live local time and weather links.
Where does the weather data come from?
Open-Meteo, a free weather API that doesn't require an account or API key — the same source used on WatchTime Online's Weather tool and city pages.
Why are temperatures shown in Celsius?
Because most of the 17 cities, and most of the world, use Celsius, it keeps the comparison on one familiar scale. For a single city in Fahrenheit, with an hourly and 7-day forecast, use the weather tool.
How is the moon phase calculated?
From the current date and the average length of the lunar cycle, about 29.53 days, counted from a known new moon. It is the same everywhere on Earth on a given date, so no location is needed.
What does the clock watch look for?
Any change in a city’s UTC offset during the next 21 days, which in practice means a daylight saving time switch.