Last updated: August 21, 2025
December in Hanko, Finland is a month of contrasts, where the maximum temperature reaches a mild 8°C (46°F), while dipping to a chilling minimum of -9°C (17°F). The average temperature hovers around 2°C (36°F), making it essential to bundle up for chilly outings. This time of year sees significant precipitation, with a total of 80 mm (3.1 in) falling over approximately 19 days, lending a damp feel to the air. With humidity levels soaring at 90%, December envelops Hanko in a frosty embrace, setting the stage for a truly wintry experience.
In December, Hanko, Finland experiences a distinct chill, as temperatures dip with a minimum of -9°C (17°F) and an average hovering around 2°C (36°F). With maximum temperatures reaching 8°C (46°F), the month marks a transition into full winter, where frosty mornings and the potential for light snow create a picturesque setting. The trend from November's relatively milder averages gives way to a more pronounced cold, making December a month where warm layers become essential. As daylight dwindles, the crisp air invigorates the senses, inviting both locals and visitors to embrace the seasonal charm of this coastal town.
December in Hanko, Finland, ushers in a notable increase in precipitation, totaling 80 mm (3.1 in) over 19 days. This trend reflects a vibrant wetness as the month closes the year, following November’s substantial 82 mm (3.2 in) of rain across 17 days. The nearly consistent precipitation leading into the winter hints at a lingering transition from autumn's dampness to the chill of winter, where the days are marked by a persistent, refreshing drizzle. As Hanko braces for colder months, the steady accumulation of moisture not only rejuvenates the landscape but also lays the groundwork for the winter flow of water systems in the region.
In Hanko, Finland, December marks a continuation of the year’s high humidity, with levels averaging around 90%. This figure closely mirrors the humidity levels of the preceding months, particularly October and November, which also hovered in the low nineties. As the winter chill sets in, the air retains moisture, contributing to a damp atmosphere. Early winter humidity trends show a gradual decline from the peak of approximately 92% in January, but December maintains a consistent and moist environment, reminiscent of the late autumn months. Interestingly, while the warmer months from May to August experienced lower humidity levels around the mid to high seventies, the transition back to winter brings a notable increase, enveloping the region in a cool, humid embrace as the year draws to a close.
In December, Hanko, Finland experiences a low UV Index of 1, consistent with the preceding months of November and both January and February. This low level indicates a burn time of 45 minutes, allowing residents and visitors to enjoy outdoor activities with minimal risk of sun exposure. The UV Index shows a clear seasonal trend, rising modestly from 1 in winter to 7 in the height of summer, before declining again as the year winds down. This predictable fluctuation reinforces the importance of staying aware of UV levels, even during the colder months. For more details about UV exposure throughout the year, visit Hanko UV Index.
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In Hanko, Finland, the sunshine hours in December reveal a significant decline as winter deepens, with a modest 73 hours of daylight. This is a stark contrast to the vibrant 461 hours of sunshine in May, ushering in a lush spring that gradually gives way to the sun-drenched summer days of June and July. As the year progresses, sunlight peaks in these summer months, only to taper off dramatically come fall, where the daylight diminishes to 135 hours in November. The transition from autumn to winter is palpable, marked by a steady decline in brightness, inviting a reflective pause as nature prepares for the quietude of the colder months. Despite the dwindling sunshine, each hour of December’s light becomes a cherished moment, a fleeting gift as the community braces for the long nights ahead.
In Hanko, Finland, the likelihood of sunny weather in December is relatively low, with only a 17% chance of sunshine. This marks a continuation of the downward trend in sun exposure as the year draws to a close. As we compare December to the earlier months, it becomes clear that the sun starts to shy away after the brighter summer months, peaking in July at 61%. The gradual transition from late summer to winter shows a significant drop, particularly from October's 22% to November's 24%, before settling at December's modest percentage. This pattern underscores the seasonal shift, leaving Hanko shrouded in a wintry ambiance as the year ends.
As winter deepens in Hanko, Finland, December brings a return to shorter days, with daylight lasting around 6 hours. This month's daylight reflects a trend of diminishing sunlight that began in November, when the sun graced the sky for just a bit longer. As we progress from the extended brightness of summer—peaking at 18 hours in June—daylight steadily decreases, creating a rhythmic ebb that characterizes the changing seasons. While December's crisp, shorter days might feel limiting, they also invite the beauty of long, cozy nights, offering a chance to embrace winter's charm amidst the snowy landscapes. As the year draws to a close, the gradual lengthening of days will soon return, starting a new cycle of light in January.
As December arrives in Hanko, Finland, the wind picks up with an average speed of 7.9 m/s (18 mph), marking a brisk end to the year. This month sees a slight increase from the milder winds of November, which averaged 8.5 m/s (19 mph), reflecting a subtle resilience in gusts as winter sets in. Notably, the trend shows a gradual fluctuation in wind speed throughout the year, peaking in October at 9.3 m/s (21 mph), before tapering off as the colder months progress. December winds, while relatively strong, are slightly moderated compared to the autumn months, but they still contribute to the invigorating chill that defines the season. The relentless flow of air continues to characterize Hanko, making it a testament to the region's dynamic climate.
Weather in Hanko varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Hanko, focusing on differences in temperature, rainfall, humidity, and UV levels.
December and January exhibit similar maximum temperatures, both peaking at around 8°C (46°F). However, January tends to be colder, with a lower minimum temperature of -13°C (8°F) compared to December's -9°C (17°F). The average temperature in December is slightly warmer at 2°C (36°F), while January's average dips to 1°C (33°F). In terms of precipitation, December experiences more rainfall, totaling 80 mm (3.1 in) over 19 days, whereas January sees a decrease with 56 mm (2.2 in) over just 14 days. Humidity remains high in both months, with January slightly edging out at 92% compared to December's 90%. For more detailed insights, check Hanko weather in January.
In December, the weather shows a bit more mildness with average temperatures around 2°C (36°F), while February tends to be colder, averaging -1°C (31°F). December experiences slightly higher maximum temperatures of up to 8°C (46°F), compared to February’s peak of 6°C (43°F). Precipitation is more frequent in December, with rain or snow falling on 19 days and totaling 80 mm (3.1 in), whereas February sees significantly less precipitation, accumulating only 49 mm (1.9 in) over 11 days. Despite the colder temperatures, February maintains a similar humidity level at 91%, slightly higher than December's 90%. For more detailed insights into February weather, you can explore Hanko weather in February.
December and March exhibit distinct weather characteristics, despite their similarities in humidity. In December, temperatures fluctuate from a chilly minimum of -9°C (17°F) to a maximum of 8°C (46°F), with an average of 2°C (36°F). This month also sees significant precipitation, totaling 80 mm (3.1 in) over 19 days. Conversely, March brings slightly colder conditions, with temperatures ranging from -10°C (13°F) to a maximum of 7°C (44°F) and an average of 0°C (33°F). Precipitation is less frequent in March, with a total of 50 mm (2.0 in) over just 10 days. For more details about March weather, you can check Hanko weather in March.
December weather presents a stark contrast to that of April, with significantly lower temperatures and higher humidity levels. In December, temperatures can drop to as low as -9°C (17°F), averaging around 2°C (36°F) and peaking at 8°C (46°F), while precipitation is quite frequent, occurring on 19 days and totaling 80 mm (3.1 in). In contrast, April offers a milder climate, with minimum temperatures around -2°C (29°F) and averaging 3°C (38°F), reaching up to 9°C (49°F). Rainfall is considerably less frequent in April, with only 7 days of precipitation amounting to 28 mm (1.1 in) and slightly lower humidity at 87%. For those interested in more specific details, you can check out Hanko weather in April.
December and May present a stark contrast in weather conditions. In December, temperatures can plunge to a minimum of -9°C (17°F) and only reach an average of 2°C (36°F), with highs around 8°C (46°F). This chilly month also sees significant precipitation, totaling 80 mm (3.1 in) over 19 days, coupled with high humidity levels of 90%. In comparison, May boasts milder temperatures, with a minimum of 1°C (35°F), an average of 8°C (46°F), and maximums reaching 18°C (64°F). The month is significantly drier, with only 36 mm (1.4 in) of precipitation spread across just 7 days and a lower humidity of 76%. For a closer look at the conditions in May, check out Hanko weather in May.
December and June present stark contrasts in weather patterns. In December, temperatures can drop as low as -9°C (17°F), with an average of 2°C (36°F) and a high of 8°C (46°F), accompanied by significant precipitation of 80 mm (3.1 in) over 19 days and high humidity at 90%. In contrast, June enjoys milder temperatures, ranging from a minimum of 6°C (44°F) to an average of 14°C (57°F) and peaking at 22°C (73°F). Precipitation also decreases significantly to 37 mm (1.5 in) over just 6 days, with humidity levels slightly lower at 80%. For a more detailed look at the June climate, check out Hanko weather in June.
In December, temperatures in Hanko can dip as low as -9°C (17°F) during the night, with average highs around 2°C (36°F) and peaks reaching only up to 8°C (46°F). This month also sees significant precipitation, totaling about 80 mm (3.1 in), spread over 19 days, coupled with high humidity levels of 90%. In contrast, July offers a much warmer climate, with nighttime lows of 12°C (53°F), average temperatures around 17°C (63°F), and maximums that can reach 25°C (76°F). July experiences less rainfall, with only 57 mm (2.2 in) over just 8 days and humidity averaging 80%. The stark difference between the two months highlights the chilly, wet conditions of winter compared to the milder, drier summer weather. For more detailed insights about Hanko's July weather, visit Hanko weather in July.
December and August present stark contrasts in weather conditions. In December, temperatures plunge, with averages around 2°C (36°F) and a chilling minimum of -9°C (17°F), while humidity remains high at 90%. The month sees around 80 mm (3.1 in) of precipitation spread over 19 days, creating a damp and frosty environment. In contrast, August enjoys milder temperatures, ranging from a comfortable minimum of 11°C (51°F) to a maximum of 23°C (73°F) and an average of 17°C (63°F). Although precipitation is slightly higher at 94 mm (3.7 in), it occurs over fewer days, just 13, with humidity levels at a more moderate 83%. For a detailed look at weather conditions during August, you can visit Hanko weather in August.
In December, the weather is significantly colder than in September, with temperatures ranging from a minimum of -9°C (17°F) to a maximum of 8°C (46°F), compared to September’s milder range of 7°C (45°F) to 20°C (68°F). December experiences more precipitation, totaling 80 mm (3.1 in) over 19 days, while September sees slightly less at 71 mm (2.8 in) over 14 days. Additionally, December's humidity is higher at 90%, compared to September's 87%. For a closer look at September weather specifics, you can visit Hanko weather in September.
In December, the weather tends to be significantly colder than in October, with average temperatures hovering around 2°C (36°F) compared to October's more mild average of 10°C (49°F). While both months experience similar levels of humidity at 90%, December brings lower maximum temperatures—capping at 8°C (46°F) versus October's warm high of 16°C (61°F). Additionally, October has a greater amount of precipitation, with 123 mm (4.8 in) falling over 19 days, compared to 80 mm (3.1 in) in December, also over 19 days. For more detailed information, you can check Hanko weather in October.
December weather is notably colder than November, with average temperatures dropping from 6°C (43°F) in November to just 2°C (36°F) in December. The minimum temperatures also take a dive, with December reaching lows of -9°C (17°F) compared to November's milder minimum of -3°C (26°F). Precipitation levels remain similar, with December recording 80 mm (3.1 in) over 19 days, slightly less than November's 82 mm (3.2 in) across 17 days. Humidity levels are quite comparable, hovering around 90% in December and increasing slightly to 91% in November. For more details on November's weather, you can visit Hanko weather in November.
As December sweeps through Hanko, it brings a noticeable chill that sets it apart from the milder months of the year. With temperatures dipping to their lowest extremes, residents experience the crisp bite of winter, contrasting sharply with the warmth of autumn. The increased precipitation and high humidity create a damp atmosphere as rain and occasional snowflakes blanket the town. This month, with its unique combination of colder weather and frequent gray skies, invites both locals and visitors to embrace the cozy charm of winter. For a deeper dive into the climatic patterns of the region, check out Hanko Climate.