🌦️ Online Gaussen diagram
Study station
No point selected yet. Click on the map to choose a location.
Chart settings
The chart combines monthly precipitation (mm, left axis) and mean monthly temperature (°C, right axis) on a P = 2T scale: a month is dry when the temperature lies above the precipitation. For the current year, only the available months are shown.
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Online Gaussen diagram — dry and wet months, no software, in under a minute
A Moroccan platform to create the Gaussen ombrothermic diagram of any study station: monthly temperature and precipitation combined on a P = 2T scale to identify dry and wet months. No GIS software, no tables to process: pick the location and year.
- Daily ERA5-Land data (temperature and precipitation) since 1950
- Automatic identification of dry and wet months and the longest dry period
- Customizable colours, precipitation display and axes
- Free Word report for approved orders
How does it work?
- Choose a point: Click on the map to select the study station.
- Choose the year: Select the year from the list (since 1950).
- Generate and customize: Click "Generate Gaussen diagram", adjust the colours, then download.
Frequently asked questions
How do I create the Gaussen diagram of my site?
Click a point on the map, choose the year, then press "Generate Gaussen diagram". In under a minute the chart combines monthly precipitation (bars) and the temperature curve, with the dry and wet periods coloured.
What does the relation P = 2T mean?
According to the Bagnouls–Gaussen criterion, a month is dry when its precipitation total P (mm) is lower than twice its mean temperature T (°C). The precipitation scale is therefore drawn at twice the temperature scale: the month is dry when the temperature curve lies above the bars.
What happens if I choose the current year?
Only the available months are shown. The last incomplete month appears with a hollow marker and is classified neither dry nor wet, since its total is partial.
Is the platform free?
Generation, preview and customization are free. The watermark-free PNG and the Word report require an approved order (5 image downloads per order; the report is free for the holder of an approved order).
What is the data source?
ERA5-Land reanalysis (Copernicus / ECMWF): mean air temperature at 2 m and daily precipitation totals, available since 1950 via Open-Meteo.