Climatic Conditions in the Český Krumlov Region
 

 Map of climatic areas of the Český Krumlov region
The Český Krumlov region is equally set between two climatical areas - a moderately warm (MT 3, MT 4 and MT 5) and cold area (CH 6, CH 7).

The warmest region no. 5 lies in the area of hills around the Blansky woods and Český Krumlov. It is characterized by normally long-to-short, mild-to-moderately-cold, dry-to-moderately-dry summers, moderate springs and autumns, and dry winters with a short-term snow cover. The region no. 4 has shorter transition periods (spring, autumns) and colder winters. A small part of the area in the northeast of the region belongs to the region as well. The moderately warm region no. 3 is largest and is located in the area around Vltava and the Lipno reservoir, the hills on the edge of Blansky woods, Pomalší and the Novohradské hills piedmont. It is characterized by short and moderate summers, longer transition periods (spring, autumn) and normal, moderately cold and moderately dry winters.

Monastery Zlatá Koruna, autumn mood, foto: Libor Sváček

Regions no. 6 and 7 are cold climate areas. They represent a more severe climate of highlands and mountain areas. Region no. 7 covers a larger part of the region (the entire Českokrumlovsko highlands and the lower part of Šumava, the Rojovský ridge and the entire Novohradské hills. Short, moderately cold and humid summers, long transition periods with cold springs and moderate autumns and moderate to moderately humid winters with snow covers are typical of this region. Region no. 6 (rather humid and short summers, colder springs and autumns, longer and colder winters with frequent fall) is only located in the southwest part of the region (the Smrčiny mountain range).

Spring snowdrop, foto: Ladislav Pouzar

The average annual temperature is around 7.5 °C in the warmest parts of the region (the Blansky woods piedmont), in Lipensko around 5.5 °C. July with the average temperature of 17 °C (Lipno 15 °C) is usually the warmest month in the year, while January is the coldest month with temperatures of -2.5 °C (higher areas -4 °C). The longest series of meteorological observations is from Vyšší Brod. In recent decades, there are records of a maximum temperature of 36,0 °C (27.7.1983), the minimum temperature of -29 °C was recorded here in 1923. The annual number of summer days, i.e. days with the temperature of at least 25 °C, is 38 on the average in the warm areas of the region, while in the Lipno area it is 34. The annual number of frost days, where the lowest temperature gets below the freezing point, is 120 on the average and in Lipno it is even 150.

Typical summer countryside around Český Krumlov, foto: Václav Dolanský

The amount of rainfall, considering the large mountainous nature of the region, is very unbalanced. While the annual fall in the Křemžská hollow is less than 600 mm, i.e. 600 l/m2, in the border ridge of Šumava it is more than 1000 mm. June and July have the most rainfall (approx. 100 mm per month), the largest part of the summer rainfall usually occurs in storm downfalls. Monthly fall in the winter months is around 30 mm, but in the mountain areas it can be even 70 - 80 mm.

The sun shines 1500 hours per year on the average. In June and July, it is 180 to 200 hours per month, and in December and January only about 30 - 40 hours. Due to the occurrence of inversions, the amount of sunshine in the mountainous areas can be even double in winter months.

Šumava - Lake Lipno in winter

The Český Krumlov region is typical of various microclimatic aberrations. This implies that the highest altitudes of the Novohradské hills and Svatotomašské range have a much more severe and humid climate considering the region, while the southern and southwestern slopes of the Želňava highlands and the granolith systems of the Blansky woods are climatically far more benign. This especially applies when one considers the altitudes above sea level and typification, being under the influence of the border Šumava ridge working as a fall screen and also being affected by the fan warming. As has just been verifed, the southern slopes of the Svatotomašske range were even used for wine growing! In the averaged values, you cannot see effects of strong temperature inversions occurring in all terrain lowlands, especially in valleys with rivers and streams (e.g. Vyšší Brod or Loučovice are shown in meteorological reports as locations with the lowest temperatures in the ČR). Somewhere these effects occur even on a large area level (e.g. in the hollow of the Vltava, in the table-land between Světlík and Frymburk etc.), thereby moving the real character of the climate to values far less favorable which differ from the climatic map.

(vd)

Further information :
Description of Natural Conditions in the Český Krumlov Region

 



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