Last updated: January 18, 2025
The climate of Uusimaa, Finland, is characterized by its Dfb Koppen-Geiger classification, representing a humid continental climate with significant seasonal temperature variations. Winters can be exceedingly cold, with minimum temperatures plummeting to -29°C (-20°F) in February, while summers are notably warm, reaching maximums of 32°C (90°F) in July. The region's average annual temperature is a mild 6°C (44°F), highlighting the distinct contrast between its frigid winters and warm summers, shaping both the local ecosystem and residents' lifestyles.
Uusimaa, Finland, exhibits distinct seasonal temperature patterns, marked by cold winters and warm summers. January and February are characterized by extreme cold, with minimum temperatures reaching as low as -29°C (-20°F) in February, and average monthly temperatures hovering around -3°C (27°F) to -4°C (26°F). As spring approaches in March and April, a gradual warming occurs, with average temperatures rising from -1°C (31°F) in March to 4°C (39°F) in April, while maximum temperatures can soar to a pleasant 22°C (71°F). The transition into summer is marked by notable warmth in June and July, featuring maximum temperatures consistently reaching 32°C (90°F), alongside average temperatures around 18°C (64°F). The onset of autumn begins a cooling trend; however, September still boasts a relatively mild average of 12°C (54°F). By November, temperatures drop significantly, culminating in cold winter months where average temperatures fall back to 3°C (38°F) in November and -1°C (30°F) in December, thus illustrating the dynamic nature of Uusimaa's climate throughout the year.
Porvoo experiences a minimum temperature of -25°C (-13°F) in February and peaks at 32°C (89°F) in July, as highlighted in the monthly temperatures in Porvoo. Meanwhile, Helsinki records a minimum of -23°C (-9°F) in January and reaches a maximum of 32°C (90°F) during July, detailed in the monthly temperatures in Helsinki. Similarly, Espoo has a minimum temperature of -23°C (-8°F) in January, with a maximum of 31°C (88°F) in July, as shown in the monthly temperatures in Espoo.
Uusimaa, Finland, experiences a varied precipitation pattern throughout the year, with notable differences across the seasons. Winter months, particularly January and February, see relatively modest rainfall, with 55 mm (2.2 in) and 48 mm (1.9 in) of precipitation respectively, falling on approximately 11 and 9 days. As the days warm into spring, precipitation remains consistent, peaking slightly in May at 52 mm (2.1 in). This trend of moderate rainfall continues into the early summer, where monthly totals in June mirror January's with 55 mm (2.2 in) being recorded.
The summer months of July and August exhibit a significant increase in rainfall, highlighted by 79 mm (3.1 in) and 80 mm (3.2 in), respectively, corresponding with about 11 to 12 days of rain per month. Following the summer peak, September experiences 67 mm (2.6 in), and October reaches its highest monthly total at 88 mm (3.5 in). The late autumn and winter months show a return to lower levels of precipitation, with November and December receiving 61 mm (2.4 in) and 74 mm (2.9 in), and an increase in rainy days, particularly in December with 15 days of precipitation, further underscoring the region's climate variability.
In Uusimaa, Finland, sunshine duration showcases a remarkable transformation from the harsh winter months to the bright summer days. January struggles with a mere 55 hours of sunlight, reflecting the challenging conditions of the season. However, as winter fades, February witnesses a significant increase to 153 hours, signaling the gradual return of daylight. This upward trend continues through March, which welcomes 261 hours of sun, culminating in the arrival of spring and an impressive 362 hours in April. The growing daylight not only enhances the ambiance of the landscape but also encourages outdoor activities as residents bask in the rejuvenating sunlight.
The summer months truly shine in Uusimaa, reaching their apex with 490 hours of sunshine in June, which provides nearly 16 hours of daylight each day. This is closely followed by July with 483 hours, ensuring that the warm weather coincides with abundant sunlight. However, as summer transitions into autumn, a noticeable decline in sunshine hours occurs, with August dropping to 406 hours and September further decreasing to 291 hours. The onset of autumn brings shorter days, highlighted by 191 hours in October and diminishing to 112 hours in November—just before December brings a stark 57 hours of sunlight. This cyclical pattern illustrates the striking contrasts in sunshine duration across seasons, shaping the lifestyle and activities of Uusimaa's residents throughout the year.
In Uusimaa, Finland, the UV Index varies notably throughout the year, reflecting seasonal changes in sunlight intensity. During the winter months of January and February, the UV Index remains low at 1, indicating minimal risk for harm from solar UV radiation, with a suggested burn time of 45 minutes for unprotected skin. As spring arrives, the UV Index begins to rise, reaching 3 in March and 4 in April, which falls into the moderate exposure category and reduces the time needed for potential skin damage to 30 minutes. By May, it escalates further to 5—a clear sign that increased precautions are warranted.
The peak of UV exposure occurs during the summer months, particularly in June and July when the UV Index rises to 7, classifying it as high and reducing the burn time to just 25 minutes. Although August sees a slight decrease to 5, the need for protection remains significant. As autumn approaches, the UV Index gradually declines, reaching 4 in September and then falling to 2 in October, before settling back to low levels of 1 through November and December. This seasonal variation emphasizes the importance of UV awareness and protection in Uusimaa, especially during the sunnier months when UV radiation poses a greater health risk.
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In Uusimaa, Finland, daylight duration experiences a dramatic transformation throughout the year, closely mirroring the changing seasons. January begins with a short daylight span of just 6 hours, as the region endures the depths of winter. February brings an increase to 9 hours, and by March, daylight extends further to 11 hours, signaling the slow return of longer days as spring approaches. April continues this trend with 14 hours of daylight, while May ushers in a noticeable change, boasting up to 17 hours. This upward trajectory peaks in June, when residents can enjoy nearly 18 hours of daylight, providing an abundance of opportunity for outdoor activities and social gatherings.
As summer transitions to autumn, daylight duration starts to gradually wane. July still retains a generous 17 hours of sunlight, but August falls to 15 hours, marking the beginning of shorter days. By September, daylight decreases further to 12 hours, and October sees a continued decline to 10 hours. The descent into winter brings days back to 7 hours in November and diminishing to a mere 5 hours by December. This cyclic variation in daylight not only influences daily activities but also shapes the cultural and social rhythms of Uusimaa throughout the year.
Espoo, Finland experiences a diverse climate with cold winters and mild summers. January and February are the coldest months, with average temperatures around -3°C (26°F), while July can peak at 31°C (88°F). Precipitation is moderately distributed throughout the year, with the wettest month being July at 84 mm (3.3 in). Sunshine hours vary significantly, with May and June enjoying the most sun, boasting over 450 hours. For more detailed information, visit Espoo climate.
Hanko, Finland experiences a diverse climate with cold winters and mild summers. January and February have low temperatures averaging around -1°C to 1°C (31°F to 33°F) and moderate precipitation, while summer months, particularly July, reach average highs of 17°C (63°F) and around 57 mm of rainfall. The region enjoys increasing sunshine from spring through summer, peaking at 490 hours in June. Autumn brings a mix of cooler temperatures and higher precipitation, especially in October, which sees an average of 123 mm of rain. For more details, visit the Hanko climate.
Helsinki, Finland, experiences a diverse climate with cold winters and mild summers. January and February are particularly frigid, with average temperatures around -3°C (28°F) and significant snow, while July sees the warmest days, reaching up to 32°C (90°F). Precipitation is relatively consistent throughout the year, peaking in July with 91 mm (3.6 in), and sunshine hours vary significantly, with the longest days in June boasting about 493 hours of sunlight. This variation contributes to distinct seasonal changes, making Helsinki a unique climate zone. For more detailed information, visit Helsinki climate.
Porvoo, Finland experiences a varied climate with cold winters and mild summers. January and February are frigid, with average temperatures around -3°C (27°F) and -4°C (25°F) respectively, while July peaks at a comfortable 18°C (65°F). Precipitation is fairly consistent throughout the year, with July and October receiving the most at 71 mm (2.8 in) and 80 mm (3.2 in) respectively. Sunshine hours increase from a meager 52 in January to a peak of 491 in June, contributing to a vibrant summer atmosphere. For more details on the climate in Porvoo, visit Porvoo climate.
Tuusula, Finland, experiences a diverse climate characterized by cold winters and mild summers. January temperatures can plunge to a minimum of -25°C (-13°F), while July peaks at a pleasant 32°C (89°F). Precipitation is relatively consistent throughout the year, with July receiving the highest at 82 mm (3.2 in). Sunshine hours vary significantly, from just 55 hours in January to a peak of 493 hours in June. For more detailed information, visit Tuusula climate.
In conclusion, the climate and environmental conditions of Uusimaa, Finland, reveal a striking contrast between the seasons, characterized by significant variations in temperature, precipitation, sunshine duration, UV Index, and daylight hours. The region endures harsh winters with limited sunlight and low UV levels, gradually transitioning into warm, sunlit summers that foster outdoor activities and increase UV exposure. This seasonal rhythm affects not only the local ecosystem but also the lifestyles and cultural practices of Uusimaa's residents. Understanding these patterns is essential for promoting outdoor safety and making the most of the fleeting yet vibrant summers while navigating the challenges posed by the long, dark winters.