A typical day, every day of the year
Each column is a day and each row an hour. The colour is the average temperature at that hour over , grouped into named bands. The amber line marks today.
Pleasant hours
Temperature
What it feels like
The same chart using the feels-like temperature, which accounts for wind and humidity. Wind and damp make cold days feel colder; humidity makes hot days feel hotter.
How much a day can vary
The lines are the median daily high and low. The darker band covers the middle half of days and the lighter band 80% of them, over .
The shape of each month
How often each temperature occurs in each month over , counting every hour. Each fill takes the colour of the band its median falls in.
Sun and sky
The weather mix, week by week
The share of daytime hours each week that are sunny, partly cloudy, overcast, drizzly, rainy or snowy. Each hour gets the most significant type that applies, so a cloudy hour with rain counts as rain. A dry hour is sunny when the direct sun reaching the ground is at least two-thirds of what a clear sky would give, and overcast when it is under a third. Each week is averaged with its neighbours.
UV index
The average strength of the sun's ultraviolet light at each hour through the year, in the World Health Organization's bands, from the CAMS global model. It allows for cloud, so single clear days run higher. Hours above do not count as pleasant.
Rain and wind
Rain
The grid shows how likely each hour of the day is to be rainy (), through the year, averaged over neighbouring hours and days: an even wash means it can rain at any hour, a dark band means it keeps to a time of day. The line under it is how many hours of a typical day have rain. The bars are the average rainfall in each month, labelled with its average number of rainy days (at least in the day).
Pollution
When each city is at its best
Pleasant hours a day in each month, between 7 AM and 10 PM, best city first. Southern-hemisphere seasons run the other way. A star marks a place saved in this browser.
One figure against another
Each dot is a city, coloured by region. Choose what runs across and what runs up.
Fine particles since 1998
Each line is a built-in city's yearly average PM2.5 from satellite-derived estimates. The scale starts at 0 and gives the low end more room, so the cleaner cities stay readable. The four thicker lines are the cities that changed most between the first three years and the last three, labelled with the change. The dashed line is the WHO annual guideline of 5 µg/m³. Point at a line to name it.
Pleasant hours on the same scale
Each column is a stretch of the year and each row an hour of the day, in each city's local time, most pleasant city first. Stronger colour means the hour is more often pleasant.
Temperature on the same scale
The typical-day chart for each city in its own local time, using the same colour bands, over . Southern-hemisphere seasons run the other way.