The Czech Republic is a landlocked country located in moderate geographical latitudes in the Northern Hemisphere.The climate of the Czech Republic is mild but variable locally and throughout the year.
The climate differs markedly among the various regions of the Czech Republic, depending on the height above sea level. Generally speaking, the higher you are, average temperatures may drop more and rainfall is more likely. Many other factors also play a role in this – the border mountain ranges, for example, significantly influence ground-level air flow and rainfall.
Various height levels of the sun during the year cause the changing of the seasons, differentiated from each other mainly by the development of temperatures and precipitation. Similarly to the whole moderate northern band, the beginning of the year in the Czech Republic is also characterized by a cold winter. After this comes spring, followed by a warm summer and chilly autumn. The alternation of the seasons has a marked effect, above all on vegetation.
The weather at any given time may differ significantly from the long-term average. This variability of the weather is caused mainly by the changeable location and magnitude of two main pressure centers: the Icelandic Low and the Azores High. Mainly during the warm middle of the year, it can generally be said that expansion of the high pressure projection into our territory causes warmer and drier temperatures, whereas the Icelandic Low manifests itself with a greater number of atmospheric fronts, which bring more clouds and precipitation.
The climate of the Czech Republic can then be labeled as moderate, of course with great local diversity seen throughout the year. Further changeability then is up to the weather itself.
The climate in South Bohemia is of a transitional Central European type: it is affected alternatively by an oceanic influence from the west, and a continental influence from the east, so the weather can be variable. Most of the South Bohemian region belongs to the mild, warm and wet zone - at altitudes above 750 m this passes to mild and cool. The warmest month is usually July, with temperatures averaging 17 - 18 °C in valley areas, however in higher localities over 900 m temperatures can drop below 14 °C. Days with temperatures above 25 °C are most frequently in valley-basins, and the area around the confluence of the rivers Lužnice and Vltava (Moldau): on average there are 40-50 such days a year. Nearly every year maximum temperatures exceed 30°C in lower areas of the region, and exceptionally can even exceed 35 °C.