Prague Clementinum: basic facts and interesting figures
General information
| Latitude | 50° 05' 11'' N |
| Longitude | 14° 24' 59'' E |
| Altitude | 191 m |
| Beginning of regular observations | 1752 |
| Beginning of continuous temperature records | 1775 |
| Beginning of continuous temperature records | 1804 |
Long-Term means
| Characteristic | 1961–1990 | 1971–2000 | 1981–2010 | 1991–2020 |
| Annual mean air temperature | +10.0 °C | +10.4 °C | +10.8 °C | +11.3 °C |
| Mean air temperature in January | -0.2 °C | +0.7 °C | +0.9 °C | +1.6 °C |
| Mean air temperature in July | +19.7 °C | +20.1 °C | +20.8 °C | +21.5 °C |
| Annual mean total precipitation | 470,3 mm | 457.8 mm | 458.6 mm | 453.9 mm |
Record values of air temperature, precipitation and air pressure
| Characteristic | Lowest | Date | Highest | Date |
| Absolute temperature | -27.6 °C | 1st March 1785 | +37.8 °C | 27th July 1983 |
| Daily mean temperature | -24.8 °C | 22nd January 1850 | +31.9 °C | 27th July 1782 |
| Monthly mean temperature | -11.0 °C | February 1929 | +25.2 °C | August 1807 |
| Annual mean temperature | +7.2 °C | 1838 a 1871 | +12.8 °C | 2018 |
| 24–hours total precipitation | 90.0 mm | 19th July 1981 | ||
| Monthly total precipitation | 0.0 mm | October 1908 | 214.3 mm | July 1981 |
| Annual total precipitation | 255.3 mm | 1842 | 723.1 mm | 1939 |
| Sea level air pressure | 968.7 hPa | 25th February 1989 | 1055.4 hPa | 27th December 1840 |
The presented values are valid only for Prague – Clementinum station and they should not be mistaken for those valid for the whole territory of the Czech Republic.