Climate and monthly weather forecast
Karlovy Vary, Czech Republic

Karlovy Vary, a beautiful city in the Czech Republic, adheres to the Cfb — Marine West Coast, Warm Summer — classification according to the Köppen climate system. Its climate reflects the city's geographical position in central Europe. Several characteristics distinguish the weather conditions in Karlovy Vary: mild summers, chilly winters, and a gentle, year-long presence of rainfall.

A review of the climatological data reveals a robust seasonal variation across all weather parameters. Temperatures present a distinctive bell-curve pattern, scaling from a low of -6°C (21.2°F) in the winter months to a summer peak of 21°C (69.8°F). Rainfall also exhibits a pronounced seasonal pattern, with averages ranging from 43mm (1.69") to 69mm (2.72") over the year. The months of June, July, and August experience the highest rainfall totals, with a maximum of 69mm (2.72").

Concerning sunshine duration and daylight hours, summer undeniably triumphs - from 15.9 to 16.3 hours of daylight in June and July, pairing with a high of 7 hours of sunshine throughout the same period. In contrast, winter brings shorter days with the lowest daylight — 8.1 to 8.6 hours in December and January, cast together with a minimum of just 1 hour of sunshine.

Rainfall reveal consistency; every month encounters a moderate number of rainy days between 13 and 17 days, creating a sense of regularity in precipitation. Lastly, the UV index also follows a predictable seasonal pattern, peaking at 7 during the summer months.

Taking into account the climate parameters, the best time to visit Karlovy Vary falls between May and September. Temperatures during this period range from pleasant 16°C (60.8°F) to warm 21°C (69.8°F) with extended daylight hours reaching up to 16.3 hours in June and July. More sunshine fills these months as well, offering between 5 and 7 hours of sunshine daily. Appreciatively, the UV index drops down to a much safer level of 6 and 4 in August and September respectively. Although these months receive more rainfall, with August having the highest rainfall at 69mm (2.72"), the number of rainy days remains consistent, ensuring plenty of dry periods.

Conversely, the worst time to visit Karlovy Vary can be considered the winter season, specifically from December to February. These months are characterized by chilly temperatures, ranging from a high of 1°C (33.8°F) to a low of -6°C (21.2°F). Daylight is significantly reduced to 8.1-9 hours, and only 1-2 hours of sunshine can be expected. Rainfall is relatively high, with December recording the highest figure at 60mm (2.36"), alongside a marginally increased number of rainy days.

The spring in Karlovy Vary, stretching from March to May, is juxtaposed by steadily rising temperatures and consistent rainfall. The average high temperature starts at a cool 5°C (41°F) in March, rising to 11°C (51.8°F) in April, and finally reaching a mild 16°C (60.8°F) in May. The rainfall volume varies slightly, from a low of 43mm (1.69") in February to a high of 58mm (2.28") in May. Daylight hours also increase during this time, extending from 11.9 hours in March to 15.5 hours in May.

Summer, ranging from June to August, is the warmest season in Karlovy Vary. The city receives between 15.9 and 16.3 daylight hours daily. The maximum average temperature peaks at 21°C (69.8°F), while the minimum averages around 10°C (50°F). Additionally, this season experiences the highest rainfall of the year - from 67mm (2.64") to 69mm (2.72"). Yet, with an average of 15-16 rainy days, there are plenty of opportunities to enjoy the warm, sunny weather which averages between 6 and 7 hours daily.

The autumn months of September through November feature a noticeable cool down from the warm summer months. Average high temperatures decrease from 17°C (62.6°F) in September, to 11°C (51.8°F) in October, and finally down to 4°C (39.2°F) in November. Rainfall reduces slightly, peaking at 52mm (2.05") in November, while the number of rainy days remains quite static at between 13 and 15 days. Daylight hours decline progressively, falling from 12.6 hours in September to just 9 hours in November.

Officially setting in December and ending in February, winter in Karlovy Vary displays the lowest temperatures and daylight hours of the year. Temperatures oscillate between a high of 1°C (33.8°F) and a low of -6°C (21.2°F), and daylight is restricted to between 8.1 and 9 hours. Rainfall averages hover between 53mm (2.09") and 60mm (2.36"). However, the relative absence of sunshine — averaging only 1 to 2 hours daily — defines the winter season as the least favorable time to visit.

Karlovy Vary starts the year on a cold note, with freezing temperatures and consistent occurrences of snow. The climate remains mainly desolate, the sun peeking out for short periods amounting to 2 hours daily on an average. Winter in this Czech town displays an extremity as the mercury dips as low as -6°C (21.2°F). Weather in January »

February brings a slight elevation in the temperature but still retains the cool of the starting winter. It shares similar characteristics with the preceding month - bone-chilling cold, thin layers of snow covering the landscape. Weather in February »

March witnesses the transition from the biting cold of winter to the pleasant nip of spring. The town of Karlovy Vary flourishes underneath the increasing daylight hours and the receding cold. Though still on the lower side, the temperature range this month lingers between -2°C (28.4°F) and 5°C (41°F), a notable increase from February's chill. Weather in March »

April officially invites spring's embrace, with a palpable revamp of the natural elements of Karlovy Vary. The city turns vibrant with flora and fauna, spearheading an exciting chapter of the year. This month experiences a warmer temperature pattern, fluctuating gently from 1°C (33.8°F) to 11°C (51.8°F). Weather in April »

May propels Karlovy Vary into the threshold of summer and consequently, tourism influx. The city basks under the sun more often, resulting in a surge in the average daily sunshine hours. The environment grows slightly hotter, recording a shift in temperature to 6°C (42.8°F) and 16°C (60.8°F) range. Weather in May »

June welcomes the onset of summer as the weather turns warmer and the day length extends. Hijacking activities and a noticeable pump of energy characterize this month as it heralds the main summer festivities. The thermal city sees the daytime temperature soaring to a yearly peak of 19°C (66.2°F). Weather in June »

July unfolds the zenith of summer temperatures, offering warm yet comfortable weather conditions. There are longer periods of sunshine and the UV Index reaches an annual high, bringing attention to adequate sun protection measures. Weather in July »

August replicates the warmth of July while subtly hinting towards the approaching autumn. The days remain long, keeping the weather consistently warm despite the dwindling summer. The place radiates a soothing essence under the temperature bracket of 10°C (50°F) to 21°C (69.8°F). Weather in August »

September in Karlovy Vary welcomes autumn and a shift in weather patterns, with temperatures dipping and the air growing crisper. The change of season reflects in the landscape, the leaves turning russet and gold. With temperatures ranging from 7°C (44.6°F) to 17°C (62.6°F), the city begins to cool off. Weather in September »

October plunges Karlovy Vary further into a colder phase as autumn fiercely sets in. Trees undrape their leaves, shrouding the city in shades of gold and brown. The temperature display a downward trend, marking minima and maxima at 3°C (37.4°F) and 11°C (51.8°F) respectively. Weather in October »

November witnesses a further drop in temperatures, ushering in the first signs of winter. The cityscape presents a bare look with skeletal trees and quiet environments. The thermometer records a dive in the range as it shows figures from -1°C (30.2°F) to 4°C (39.2°F). Weather in November »

December wraps up Karlovy Vary in a cold envelope, ready to experience the full brunt of winter. Festive decorations and winter activities bring life into the city despite the harsh climate. The temperatures stoop to icy levels, moving between -4°C (24.8°F) and 1°C (33.8°F). Weather in December »