The climate of the Czech Republic can be described as typical European continental influenced climate with warm, dry summers and fairly cold winters. January is the coldest month with daytime temperatures usually around zero, but in some cases winter months can be very cold with temperatures far below zero and strong, cold winds. Heavy snowfall or even snowstorms are also possible on some days; the yearly average number of days with snow is less than 40 in the low-land regions and up to 120 days in the mountainous areas of the Czech R epublic.
In summer daytime temperatures reach 20-25°C, but sometimes quite higher, 30°C or more. In most of the time is dry weather with sunny spells, although sometimes heavy Thunderstorms can occur at the end of the day, especially in the mountainous regions. July is the warmest month with an average Temperature of nearly 20°C. The driest area, around Zatec, has an average annual rainfall of 410 mm, whereas near Lysa Hora in the mountain region the average annual rainfall amounts to 1600 mm.
The weather is best May-September, when days are warm and the nights are cool, although it rains more in Spring than in summer. Autumn is usually a little chilly and wet, and the Winters can be very cold, damp, snowy, often foggy and sometimes the air can be quite polluted (inversion).
Lightweight cotton clothing is advised for the summer months, with a Sweater for cool evenings and an umbrella/raincoat. Waterproof medium- to heavywear is neccesary for the winter.
The Climate of the Czech republic can be classified as Cfb Climate; a warm temperated humid climate with the warmest month lower than 22°C over average and four or more months above 10°C over average.The climate some higher Mountainous Regions of the Czech republic can be classified as Dfb Climate; a humid Snow climate with the warmest month between 10°C and 22°C, the coldest month below -3°C and at last four or more months above 10°C.