Measurement programme

Meteorological parameters observed or measured, observation times and measurement techniques.

From 2020, the measuring operation of the weather station of the German Weather Service on the Telegraphenberg will be completely converted to automatized measurements.
Not all listed parameters are measured anymore.

Long-term climate series of Meteorological Station Potsdam 01.01.1893 - 31.12.2019

Observation times:

  • 7.08,
  • 14.08,
  • 21.08 Central European Time

Unbroken use of unchanged conventional measurement techniques maintaining a specific fixed observation procedures.

Observation site of the Long-Term Meteorological Station

The following meteorological parameters are observed or measured:

Air temperature

  • (Unaspirated) measurement in a wooden open-air thermometer box at the above three observation times as well as hourly evaluation (thermograph).
  • Extreme values, maximum, minimum.

Relative humidity

  • Determined from the wet-bulb temperature (simple aspirated psychrometer) at the above observation times, hourly evaluation (hygrograph).

Vapour pressure

  • Determined from wet-bulb temperature (simple aspirated psychrometer) at the above observation times.

Minimum near-ground temperature

  • Determined 5 cm above grass height.


  • Direction, strength, peak speeds, momentary and daily values, hourly means.

Ground state

  • 10 different types of conditions

1. dry
2. damp
3. wet/soggy
4. frozen hard
5. ice/glazed frost
6. patchy snow
7. broken snow cover, moist
8. complete snow cover, moist
9. broken snow cover, dry-fluffy
10. complete snow cover, dry-fluffy.

Horizontal visibility

  • Continuous observation.


  • Record-time and daily totals, full-year operating precipitation recorder, hourly analysis of the registered measures between 1. April and 31. October.

Sequence of weather

  • Continuous recording of all phenomena.

Cloud cover

  • Observation at the above three times, type and degree of cover with and without cirrus clouds.

Snow cover

  • Development of snow cover, measurement of total snow depth and new snow depth at 7.00 hrs, determination of water content when snow cover is 1 cm or more deep.

Frost depth

  • Daily measurement on an area kept free of snow.

Soil temperatures

  • Daily measurement at 1.00 hrs, 7.00 hrs, 13.00 hrs and 19.00 hrs Central European Time at depths of 2 cm, 5 cm, 10 cm, 20 cm, 50 cm and 100 cm.
  • Daily measurement at 13.00 hrs at depths of 2 m, 4 m, and 6 m.
  • On Mondays at 13.00 hrs measurement at 12 m depth.
  • Site consecutively kept free of snow.

Sunshine duration

  • Recording of hourly and daily sums.
  • Sunshine recording by the Campbell-Stokes method using a yellow-colored sphere.

Air pressure

  • Daily recording at the three observation times plus 3-hourly analysis.

Saturation deficit

  • Measurement at 14.00 hrs.

Event days

  • Characterization according to sequence of weather.

Optical phenomena

  • The usual observational program at weather stations, special observations of red sky and afterglow.