The typical climate at a meteorological station can be illustrated by a climate diagram, which shows the year-round profiles of temperature, precipitation and sometimes also hours of sunshine at the measurement location, in the form of monthly mean averages over a 30-year reference period.
What is a climate diagram?
A climate diagram illustrates the year-round profile of monthly average values for temperature, precipitation and sometimes also hours of sunshine, as well as other parameters. The mean values are calculated across a 30-year period, as far as the available data for a particular measurement station allow. This provides an overview of the climate at the particular location, and can also be an indicator of the climate in the surrounding area - e.g. in nearby towns or holiday resorts.
The data for the climate diagrams shown here are collected by the World Meteorological Organisation (WMO) and illustrated by the German Meteorological Service (DWD).
The example climate diagram shown here is of Reykjavik, the capital of Iceland. The monthly mean temperature of Reykjavik is 11 °C in July, and -1°C in January. For precipitation, there is barely a seasonal cycle. The monthly precipitation totals vary between 44 and 86 mm. By way of comparison, at the Zurich-Fluntern station, the mean temperature is 18.6 °C in July, and 0.3 °C in January. On average, it rains more in Zurich than in Reykjavik nearly every month of the year. The maximum precipitation in Zurich is in July, with 128 mm. The seasonal cycle is therefore the exact opposite of that in Reykjavik, where it tends to rain more in the winter than in summer.
Global climate diagrams
Below are links to climate diagrams for measurement stations on all continents of the earth: