The climate of the Czech Republic is moderately continental, with cold winters (during which the temperature is often below freezing) and warm summers, during which nights remain cool.
Most of the country is located between 200 and 500 meters (600 and 1,600 feet) above sea level, and has a fairly homogeneous climate. In the capital, Prague, the altitude varies between 180 and 400 meters (600 and 1,300 feet).

Precipitation is fairly frequent, but it's not abundant in most of the country, around 400/500 millimeters (15/20 inches) per year. However, being scarcer in the winter months (when the vegetation goes to rest) and more abundant in late spring and summer, it's generally sufficient for agriculture. The only moderately rainy areas are that of the Sudetes Range, where precipitation exceeds 1,000 mm (40 in) per year, that at the foot of the same mountain range (in Ostrava, precipitation exceeds 700 mm or 27.5 inches per year), and that of the south-west, along the border with Germany and Austria.
Here is the average precipitation in Prague, where 525 mm (20.5 in) of rain or snow fall per year.
Prague - Average precipitation
MonthJanFebMarAprMayJunJulAugSepOctNovDecYear
Prec.(mm)252530407575657040303025525
Prec.(in)111,21,6332,62,81,61,21,2120,7
Days7667101099767790

Since the amount of winter precipitation is not high, snowfalls are frequent but generally not abundant. On the contrary, during summer, on sunny days there can be thunderstorms in the afternoon, while Atlantic weather fronts, which can move over the country even in this season, may bring some cool and rainy days.
Here are the average temperatures of Prague.
Prague - Average temperatures
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Min (°C)-4-4038111313951-3
Max (°C)1381419222424191362
Min (°F)252532374652555548413427
Max (°F)343746576672757566554336

In Prague, the sun is rarely seen from November to February, while in summer the sun can be obscured by Atlantic disturbances as well as by cloudiness in the afternoon, which can also lead to thunderstorms.
Prague - Sunshine
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Hours234677775422

During winter, from December to February, in Prague and the other Czech cities, temperatures hover around freezing (0 °C or 32 °F) or just below, the weather is often dull and cloudy, and some light snowfalls can occur. On the contrary, outbreaks of cold from Russia can bring frosty days, when the temperature can drop to -20/-25 °C (-4/-13 °F).

In spring, from March to May, the weather is unstable, and the first warm days alternate with the return of cold weather: frosts and snowfalls can still occur in April, especially in the first part of the month. A turning point is usually the second half of May, when the maximum temperatures regularly reach or exceed 18/20 °C (64/68 °F), and the weather becomes enjoyable.

Summer, from June to August, is usually warm. There is a moderate amount of sunny days, during which some showers or thunderstorms in the afternoon may occur. In summer, there can be cool and rainy days, with highs around 20 °C (68 °F), but also hot periods, when the temperature may exceed for a few days 30 °C (86 °F). However, temperatures are usually pleasant, with highs around 22/24 °C (72/75 °F) and lows around 12/13 °C (54/55 °F).

Autumn, which goes from September to November, is initially pleasant in the first half of September, and becomes progressively more cloudy and cold, with fairly frequent rains.

Krumlov

In the north, in the mountainous area of the Sudetes, on the border with Poland, temperatures decrease with altitude, especially in summer: at 800 meters (2,600 feet) above sea level, summer is cool, and the daytime temperature is typically around 18 °C (64 °F).
The highest point in the Czech Republic is Mount Snežka, 1,603 meters (5,259 feet) high. Here are the average temperatures on the top of Mount Praded, at 1,500 meters (5,000 feet) above sea level, in the Eastern Sudetes.
Praded - Average temperatures
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Min (°C)-8-8-5-2257740-4-7
Max (°C)-4-4-11710111284-1-3
Min (°F)181823283641454539322519
Max (°F)252530344550525446393027

Best Time



The best time to visit the Czech Republic runs from mid-May to mid-September, since it is the warmest, or at least the mildest, of the year. Temperatures can be cool in May and September, and sometimes in June, while they are normally higher in mid-summer (July and August).

What to pack



In winter: bring warm clothes, such as a sweater, a down jacket, a hat, gloves, a scarf.
In summer: bring light clothes, t-shirts and shorts, but also long pants, a jacket and sweatshirt for the evening or for cooler days; a raincoat or umbrella.