Last updated: February 24, 2025
In December, Juneau, United States experiences a striking range of temperatures, with a maximum reaching 10°C (50°F), a minimum plummeting to -24°C (-10°F), and an average hovering around -2°C (28°F). This month also sees a significant amount of precipitation, accumulating 292 mm (11.5 in) over approximately 22 days, contributing to a humid atmosphere that averages an impressive 96% humidity. This blend of chill and moisture sets a distinctive backdrop for the onset of winter, making outdoor activities both invigorating and challenging.
In December, Juneau experiences a notable chill, with temperatures dipping to a minimum of -24°C (-10°F). As winter tightens its grip, the average temperature hovers around -2°C (28°F), offering a stark contrast to the milder summer months. Daytime highs reach up to 10°C (50°F), providing brief moments of respite from the cold. This month typically marks one of the coldest periods of the year, following a gradual drop in temperatures from the previous months. The trend of declining warmth becomes evident as December welcomes winter, solidifying the city's reputation for its frigid coastal climate.
December in Juneau marks the onset of winter's full embrace, delivering an impressive 292 mm (11.5 in) of precipitation over 22 days. This month showcases a significant uptick in rainfall, echoing the trend seen throughout the fall, particularly in October, which also recorded high levels at 332 mm (13.1 in). As summer transitions into winter, precipitation starts to taper slightly from the wettest months, such as August, which peaks at 280 mm (11.0 in). The consistent precipitation in December reinforces the city's reputation for a moist climate, characteristic of the Pacific Northwest, while also providing a stark contrast to the drier months earlier in the year. The prevalence of rainy days illustrates how this coastal haven transitions into a beautiful winter landscape, shrouded in mist and moisture.
In Juneau, United States, December brings a notable 96% humidity, closely mirroring the high levels seen throughout the year. As winter approaches, humidity consistently remains elevated, peaking in August at 108% and dipping slightly in the spring months of April and May to around 90%. This trend reflects Juneau's coastal climate, where moisture-laden air is prevalent, even in the depths of winter. The gradual rise in humidity from January to July highlights the area's lush, damp environment, while the stability in December suggests a continuation of this trend, making Juneau a uniquely humid destination well into the winter season.
In Juneau, the UV Index showcases a striking seasonal trend that highlights the importance of sun protection. The year begins with a low UV Index of 1 in January and December, focusing on long burn times of 45 minutes. As spring approaches, March ushers in a moderate increase to 4, followed by a leap to 5 in April, indicating a gradual rise in sun exposure risks. Come May and June, the UV Index escalates to 8, reflecting the longer days and more intense sunlight, which necessitates a quick 15-minute burn time for skin safety. This peak continues into July and August, where the Index reaches 9, marking the height of summer UV intensity. As summer fades, the UV Index dips back down to 6 in September, before trailing down to moderate levels in October and low levels once more by November. This clear fluctuation emphasizes the need for awareness about UV exposure throughout the year. To learn more about the UV Index in Juneau, visit Juneau UV Index.
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In Juneau, the sun's gentle embrace unfolds dramatically through the seasons, peaking in the vibrant months of April and May, where the city basks in 218 and 235 hours of sunshine, respectively. As winter recedes, the longer days signify a welcome transition, with March enjoying a notable uptick at 179 hours. However, as the year winds down, a stark contrast emerges, plunging from December's mere 45 hours of sunlight to the bleak 43 hours of January. This trend highlights how Juneau faces its darkest days during the heart of winter, before the gradual return of daylight begins anew in February, rallying to 125 hours. Overall, while the sunshine ebbs and flows throughout the year, the radiant peaks of spring and early summer provide a vivid reminder of nature's rhythms in this Alaskan gem.
In December, Juneau experiences a 30% chance of sunny weather, marking a slight increase compared to the preceding months, where the likelihood hovers between 8% and 16%. This modest uptick suggest that while sunshine is still a rarity in winter, the onset of December offers more optimism than the gloomier fall months. Notably, January and March dip back down to 16%, indicating that the potential for clearer skies may be a fleeting gift of the season. Overall, as the year closes, December provides a unique glimpse of sun amidst the typically overcast atmosphere of Southeast Alaska, creating a hopeful prelude to the brighter days ahead.
In Juneau, the daylight duration showcases a captivating transformation throughout the year, peaking at 18 hours in June when the sun graces the skies nearly the entire day. As winter closes in, however, daylight dwindles dramatically, dropping to just 6 hours in December. The progression is remarkable: starting from a mere 7 hours in January, the days steadily lengthen, with a noteworthy jump from 11 hours in March to 14 hours in April. This gradual increase culminates in May's robust 16 hours, before the summer solstice marks its zenith. Following June's brilliance, the daylight gradually recedes, reminding residents that even the longest days must yield to the long, dark winters characterized by just half a day's light by December. This cycle vividly illustrates the striking contrast of summer's abundant daylight against the backdrop of winter's brevity, creating a unique rhythm to life in Juneau.
In December, Juneau experiences a return to a brisk average wind speed of 2.5 m/s (5 mph), mirroring its January and October conditions. As the year progresses towards winter, it’s interesting to observe a general decline in wind speeds from spring through summer, peaking at a low of 1.4 m/s (3 mph) in July. This tranquil period contrasts sharply with the more dynamic conditions at the start and end of the year. Following the gentle summer breezes, September brings a slight uptick, hinting at the seasonal shifts ahead. As December sets in, the winds refreshingly pick up again, reinforcing the notion that while Juneau may be known for its serene summers, the year closes with a renewed vigor in its winds.
The weather in Juneau changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of December's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Juneau and find detailed weather information for every month.
In December, temperatures in Juneau range from a minimum of -24°C (-10°F) to a maximum of 10°C (50°F), with an average temperature of -2°C (28°F). The month experiences significant precipitation, totaling 292 mm (11.5 in) over 22 days, accompanied by high humidity levels at 96%. In contrast, January sees slightly cooler conditions, with minimum temperatures dropping to -25°C (-13°F) and a maximum of 8°C (47°F), resulting in an average of -4°C (25°F). Precipitation in January is lower, at 215 mm (8.4 in), and spread across 16 days, while humidity remains relatively stable at 94%. For a more detailed overview of the weather patterns in this month, visit Juneau weather in January.
In December, the weather in Juneau is quite cold, with temperatures ranging from a minimum of -24°C (-10°F) to an average of -2°C (28°F), reaching a maximum of 10°C (50°F). This month experiences significant precipitation, with about 292 mm (11.5 in) over 22 days, coupled with high humidity of 96%. In contrast, February sees slightly milder conditions, with minimum temperatures still at -24°C (-12°F) but an average of -5°C (23°F) and a maximum of 9°C (48°F). February also brings less precipitation, totaling 182 mm (7.2 in) across 14 days, and a lower humidity level of 90%. For more detailed insights into February weather, you can visit Juneau weather in February.
December and March present notable differences in weather patterns. December typically experiences colder temperatures, with a minimum of -24°C (-10°F) and an average temperature of -2°C (28°F), while March sees slightly milder conditions, with a minimum of -18°C (0°F) and an average of -1°C (30°F). Precipitation is also higher in December, accumulating 292 mm (11.5 in) over 22 days compared to March's 175 mm (6.9 in) over 17 days. Additionally, humidity levels are slightly higher in December at 96%, compared to 92% in March, making for a chillier atmosphere during the final month of the year. For more details on March weather in Juneau, you can check Juneau weather in March.
When comparing December and April weather, December is significantly colder, with temperatures ranging from a low of -24°C (-10°F) to a high of 10°C (50°F), whereas April sees milder temperatures, with a minimum of -13°C (9°F) and a maximum of 12°C (55°F). Precipitation is also heavier in December, with 292 mm (11.5 in) spread over 22 days compared to April's 163 mm (6.4 in) over 17 days. Additionally, humidity remains high in both months, but December has a slightly higher humidity level at 96% compared to April's 92%. For more detailed information, check out Juneau weather in April.
December and May present contrasting weather patterns. In December, temperatures can plummet to a minimum of -24°C (-10°F), with an average of around -2°C (28°F) and a maximum reaching 10°C (50°F). The month is marked by heavy precipitation, totaling 292 mm (11.5 inches), spread over 22 days, and a high humidity level of 96%. In contrast, May brings much milder conditions, with minimum temperatures of -3°C (26°F) and an average of 7°C (45°F), peaking at 21°C (70°F). Precipitation is considerably lower at 174 mm (6.9 inches) over 18 days, with humidity decreasing to 90%. This shift from the cold and damp December to the warmer and slightly drier May is quite striking. For more detailed insights, check out Juneau weather in May.
In December, the weather is marked by frigid temperatures, with a minimum of -24°C (-10°F) and an average around -2°C (28°F), reaching a maximum of only 10°C (50°F). The month sees significant precipitation, totaling 292 mm (11.5 in) over 22 days, while humidity remains high at 96%. In contrast, June presents a much milder climate, with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 25°C (77°F) and an average of 11°C (53°F). June also experiences precipitation, but at a reduced level of 189 mm (7.4 in) over the same number of days, maintaining that characteristic high humidity of 96%. For more insights, check out Juneau weather in June.
In December, the weather is characterized by cold temperatures, with a minimum of -24°C (-10°F) and an average that hovers around -2°C (28°F). The maximum temperature reaches only 10°C (50°F), and the month sees significant precipitation at 292 mm (11.5 in) over 22 days, accompanied by high humidity at 96%.
In contrast, July offers a much milder climate, with temperatures ranging from a minimum of 7°C (45°F) to an average of 13°C (56°F), peaking at 25°C (77°F). Precipitation is less intense than in December, amounting to 164 mm (6.5 in) over 18 days, though it is notable for its humidity level, reported at 104%.
For those interested in the specifics of July weather, you can find more information here: Juneau weather in July.
December and August boast starkly contrasting weather patterns. In December, temperatures plummet to an average of -2°C (28°F), with lows reaching as low as -24°C (-10°F) and highs capping at 10°C (50°F). This month is characterized by high humidity at 96% and frequent precipitation, occurring on 22 days, with a total of 292 mm (11.5 in) of rain. Conversely, August brings milder conditions, with an average temperature of 13°C (56°F) and a maximum of 27°C (80°F). The humidity is even higher at 108%, and while August sees slightly less precipitation—280 mm (11.0 in)—it occurs over just 20 days. For a closer look at weather trends specific to August, you can visit Juneau weather in August.
In December, the weather is significantly colder than in September, with temperatures ranging from a frigid -24°C (-10°F) to a milder high of 10°C (50°F), while September enjoys a more temperate range from -4°C (26°F) to 23°C (74°F). December sees an average temperature of -2°C (28°F) compared to September's average of 10°C (50°F). Additionally, December is characterized by higher precipitation, with 292 mm (11.5 in) falling over 22 days, whereas September experiences slightly less at 259 mm (10.2 in) over 17 days. Interestingly, September also has higher humidity levels at 101% compared to December's 96%. For more details, you can check out Juneau weather in September.
In comparing the weather of December and October, December experiences colder temperatures with a minimum of -24°C (-10°F) and an average of -2°C (28°F), whereas October's temperatures are milder, ranging from a minimum of -11°C (13°F) to an average of 4°C (40°F). Precipitation levels are slightly lower in December, totaling 292 mm (11.5 in) compared to October's 332 mm (13.1 in), although both months have about 22 days of precipitation. Humidity remains quite high in both months, with December at 96% and October at 98%, indicating a damp atmosphere. For more detailed information, you can refer to Juneau weather in October.
In December, the weather is colder than in November, with minimum temperatures dropping to -24°C (-10°F) compared to -15°C (6°F) in November. The average temperature in December is slightly lower at -2°C (28°F), while the maximum temperature remains similar at 10°C (50°F) in December and 8°C (47°F) in November. Precipitation increases slightly in December, totaling 292 mm (11.5 in) over 22 days, up from 267 mm (10.5 in) during the same number of days in November. Humidity remains high and fairly consistent between the two months, with December at 96% and November at 97%. For more detailed information, you can check Juneau weather in November.
As December rolls into Juneau, the weather takes a stark turn, embracing the heart of winter with its cold temperatures and high humidity. Unlike the milder months, December sees frosty days, where the mercury can dip significantly, making it one of the chilliest times of the year. With frequent precipitation across about three-quarters of the month, the atmosphere is often shrouded in a mix of rain and snowfall, enhancing the wintry landscape. This month’s relentless humidity, peaking at an impressive 96%, adds to the chill, making it feel even colder than it is. For a deeper understanding of what to expect from Juneau’s climate, check out Juneau Climate.