A graphic representation of climatic conditions at a particular place, which shows seasonal variations and extremes as well as mean values and therefore provides a succinct and easily accessible summary of a local climate. The diagram shows the height above sea level, the number of years during which temperature and precipitation observations continued, mean annual temperature and precipitation, mean daily minimum temperature in the coldest month and maximum in the warmest month, the lowest and highest temperatures recorded, mean daily variation in temperature, mean monthly temperature and precipitation, relative period of drought and relative humid season, mean monthly rainfall in excess of and below a given value, reduced supplementary precipitation curve, months in which the mean daily minimum temperature was below freezing, months with frosts, and the mean duration of frost-free days. The diagram was devised in 1979 by the German biogeographer Heinrich Walter. The example illustrates the climate of Edinburgh, Scotland. In the heading, the diagram states the country, city, latitude, longitude, and elevation. Below that it shows (in square brackets) the number of years during which data have been collected for temperature (30) and precipitation (30), the annual average temperature (8.7°C) and total annual precipitation (676 mm). At the top of the temperature column there is the highest average temperature in the warmest month and at the foot of the column the lowest average temperature in the coldest month. The graph shows the average monthly temperature and precipitation. The heavy line at the bottom indicates the months during which frosts are likely (January–April and December).
Walter climate diagram
Subjects: Ecology and Conservation.