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The sun, cloud and raindrop icons — a different system from the chart.
Also known as: Weather icons, Sun behind a cloud, Weather app symbols
The icons on a phone are not synoptic symbols and follow no standard at all. Each service designs its own, and the mapping from a numeric forecast to a picture is a product decision, which is why two apps show different icons for the same forecast.
The pictograms used in public forecasts and weather applications: a sun, a cloud, a sun partly behind a cloud, raindrops, snowflakes and lightning, combined to summarise expected conditions.
Contexts: Public information
Unstandardised. No body defines them, each service draws its own, and the rule mapping a numeric forecast onto an icon is a design choice — so two apps using the same underlying data legitimately show different pictures.
Nothing about a forecast icon is standardised, which is the opposite of everything else in this batch.
An icon summarises a period, not a moment, so a cloud-with-rain over a whole day may represent an hour of rain and eleven dry ones.
A simplified disc with radiating rays, a lobed cloud outline, or the two overlapping, sometimes with short tapered drops or a zigzag beneath.
Forecast pictograms and synoptic present-weather symbols look related and are unconnected systems.