December Weather in Birch Bay, United States

Last updated: February 24, 2025

Explore the December weather in Birch Bay, United States, where temperatures range from a chilly -13°C (9°F) to a maximum of 13°C (55°F), with an average settling around 4°C (40°F). This month brings significant precipitation, totaling 238 mm (9.4 in) over 19 days, making it one of the wetter months. Coupled with high humidity levels at 87%, residents and visitors alike should prepare for a mix of cold and damp conditions, characteristic of a Pacific Northwest winter.

December Temperature in Birch Bay

In December, Birch Bay experiences a notable chill as winter settles in, with temperatures dipping to a minimum of -13°C (9°F). The average temperature hovers around 4°C (40°F), providing a brisk atmosphere that's typical for the month. Daytime highs reach up to 13°C (55°F), but the drop in temperature compared to the milder fall months is evident, signaling the onset of colder conditions. As the year winds down, residents and visitors can expect a frostier environment, making December a month for cozy gatherings and winter festivities.

December Weather in Birch Bay: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Birch Bay, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec403944505661656660514540
Data source: Temperature data for Birch Bay generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Birch Bay

December marks the onset of winter in Birch Bay, bringing a notable increase in precipitation, with 238 mm (9.4 in) of rain recorded over 19 days. This follows November's peak of 296 mm (11.7 in), reinforcing a trend of escalating rainfall as the year wraps up. Compared to the drier summer months, where July and August saw mere 28 mm (1.1 in) and 23 mm (0.9 in) respectively, December serves as a reminder of the Pacific Northwest's characteristic wet season. The overall pattern illustrates a significant drop in precipitation during the summer, building back up in the fall and culminating in robust winter totals, making Birch Bay a dynamic landscape of shifting weather.

December Precipitation Trends in Birch Bay

The chart displays monthly precipitation patterns in Birch Bay, with values for each month alongside December's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec22016515913573602823149198296238
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Birch Bay

In Birch Bay, United States, December wraps up the year with a humidity level of 87%, maintaining a trend of elevated moisture that begins in the late fall. Following the peak of 88% humidity in October, there’s a slight decrease in November before leveling off in December. Throughout the year, humidity remains relatively stable, fluctuating between 76% and 88%, with the winter months consistently showing higher percentages. This pattern suggests that residents can expect a moist coastal climate, especially as they transition into winter, making December a true reflection of Birch Bay’s humid character.

December Average Humidity in Birch Bay

This chart illustrates the average monthly humidity levels in Birch Bay, with December's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how December's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%86%86%81%83%84%77%76%88%87%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Birch Bay

In December, Birch Bay experiences a notable dip in UV radiation, with the UV Index dropping to 1, categorizing exposure as low. This trend marks a shift from the preceding months' higher indexes, where summer peaks reached 9 in July. With a burn time of 45 minutes, residents and visitors enjoy a more forgiving sun during this time, making outdoor activities safer without the urgent need for sun protection. As winter sets in, the lower UV Index serves as a reminder to embrace the season while taking advantage of the crisp coastal environment. For more information on UV exposure throughout the year, you can visit Birch Bay UV Index.

Maximum UV Index Levels in Birch Bay for December

The chart shows the monthly maximum UV Index (UVI) for Birch Bay in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec234678986421
Data source: Birch Bay December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

December Sunshine in Birch Bay

December in Birch Bay brings a charming recapitulation of the year's sun-soaked hours, with 97 hours of sunshine illuminating the festive season. As the year winds down, this month showcases a notable dip compared to the vibrant 387 hours in July and the ample 331 hours of May. The steady decline from the summer's peak of sunshine radiates a tranquil ambiance, signaling the transition into the cozy depths of winter. While December may only offer a fraction of the bright days found in mid-year, these moments of sunlight amidst the colder climate create a unique winter charm, inviting residents and visitors alike to embrace the season's beauty.

Monthly Sunshine Duration in Birch Bay: December Highlighted

The December sunshine duration represents the total number of hours Birch Bay experiences direct sunlight during the month of December, excluding cloudy or obstructed periods. This chart compares the sunshine duration of December with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec83h142h204h237h331h340h387h347h251h181h124h97h
Data source: Birch Bay December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Birch Bay During December

In Birch Bay, December brings chilly days and the festive spirit of winter, but it also comes with a modest 24% chance of sunny weather. While this is an uptick from the gloomier months of November and January, it still pales in comparison to the sun-drenched summer months, where clear skies dominate with chances soaring as high as 71% in July. Interestingly, as the year progresses into spring, the likelihood of sunshine gradually improves, peaking in April and June. Thus, while December may not be known for its abundant sunlight, it sits at the tail end of a seasonal trend that hints at brighter days to come with the arrival of spring.

Percentage of Sunny Days in December in Birch Bay

The chart illustrates the percentage of sunny days in Birch Bay throughout the year, with December highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Birch Bay experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec18%25%28%54%42%55%71%50%33%24%18%24%
Data source: Birch Bay December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Birch Bay in December

As the year draws to a close, Birch Bay, United States experiences a return to shorter days in December, with daylight lasting just 8 hours. This decline follows a gradual increase in sunlight from the depths of winter in January, where the daylight spans the same 8 hours, to the long and vibrant days of 15 to 16 hours observed during the peak of summer in June. The transition showcases a natural ebb and flow, with spring and summer basking in increasing light, while autumn brings a gentle tapering off, culminating in the early dusk of winter. The cyclical pattern not only marks the changing seasons but also highlights the beauty of nature's rhythm, inviting residents to cherish each fleeting hour of daylight amidst the winter chill.

Average Daylight Hours in Birch Bay for December

The chart illustrates the variation in daylight duration in Birch Bay throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 44m10h 10m11h 56m13h 45m15h 19m16h 7m15h 40m14h 16m12h 31m10h 43m9h 7m8h 17m
Data source: Birch Bay daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Birch Bay

As December arrives in Birch Bay, the wind begins to make its presence felt, registering an average speed of 3.8 m/s (8 mph)—the highest point since November. This increase marks a subtle uptick compared to the calmer months of late spring and summer, where gentle breezes hovered around 2.3 m/s (5 mph). Interestingly, as the year progresses, a trend emerges: it appears the winds strengthen as the seasons shift, with January through April generally experiencing the weakest gusts. The late fall and winter months, however, show a consistent rise, suggesting that the December winds not only usher in the chill of winter but also invigorate the landscape, inviting both locals and visitors to engage with the crisp, refreshing air.

Average December Wind Speed in Birch Bay

The chart displays monthly wind speed patterns in Birch Bay, with values for each month shown alongside December's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how December's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec3.33.62.72.42.32.32.32.32.43.13.53.8 m/s
Data source: Birch Bay December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Birch Bay Compares to Other Months

The weather in Birch Bay 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 Birch Bay and find detailed weather information for every month.

In comparing the weather of December and January, both months exhibit similar average temperatures, hovering around 4°C (40°F), with daytime highs reaching up to 13°C (55-56°F). December, however, is characterized by colder nights, with a minimum temperature of -13°C (9°F), compared to January's milder minimum of -9°C (16°F). Precipitation is slightly heavier in December, totaling 238 mm (9.4 in) over 19 days, whereas January sees 220 mm (8.6 in) across 16 days, indicating a reduction in overall wet days. Humidity levels remain fairly consistent, with December at 87% and January at 86%. For more detailed insights about the weather specifics in January, you can visit Birch Bay weather in January.

In December, temperatures can drop as low as -13°C (9°F) but can reach a mild max of 13°C (55°F), with an average temperature of 4°C (40°F). The month is marked by significant precipitation, totaling 238 mm (9.4 inches) over 19 days, contributing to high humidity levels of 87%. In contrast, February sees slightly milder minimum temperatures, dropping only to -8°C (18°F), while retaining the same maximum and average temperatures of 13°C (55°F) and 4°C (39°F), respectively. Precipitation in February is lower at 165 mm (6.5 inches) over 17 days, with humidity slightly reduced to 85%. For more specific weather patterns during this month, you can check Birch Bay weather in February.

December and March weather present distinct contrasts in temperature and precipitation patterns. In December, temperatures can plunge as low as -13°C (9°F), with an average of 4°C (40°F) and a maximum reaching only 13°C (55°F). The month is marked by significant precipitation, totaling 238 mm (9.4 in) over about 19 days, and a high humidity level of 87%. Conversely, March sees a milder climate with minimum temperatures of -4°C (25°F), an average of 7°C (45°F), and highs soaring to 23°C (74°F). This month experiences less rainfall, accumulating 159 mm (6.3 in) over 16 days, and maintains a slightly lower humidity of 86%. For more insights into the specific weather patterns in March, check out Birch Bay weather in March.

In December, temperatures range from a chilly -13°C (9°F) to a mild 13°C (55°F), with an average of around 4°C (40°F). The month experiences substantial precipitation, totaling 238 mm (9.4 in), over 19 rainy days, while humidity hovers around 87%. In contrast, April brings a more moderate climate, with temperatures ranging from 0°C (32°F) to a pleasant 25°C (78°F) and an average of 10°C (50°F). Precipitation is lower, at 135 mm (5.3 in), over 15 days, and the humidity remains similar at 86%. For more specific details on April weather, you can check out Birch Bay weather in April.

December and May showcase a stark contrast in weather conditions. In December, temperatures can plummet to a minimum of -13°C (9°F), with an average of 4°C (40°F) and a maximum of 13°C (55°F). The month is also characterized by significant precipitation, totaling 238 mm (9.4 in) over 19 days, accompanied by high humidity at 87%. In contrast, May brings milder temperatures, starting with a minimum of 4°C (40°F), averaging 13°C (56°F), and soaring up to a maximum of 28°C (82°F). Precipitation is notably less, with 73 mm (2.9 in) over just 10 days and a slightly lower humidity level of 81%. For a more specific look at the weather patterns in May, you can view details here: Birch Bay weather in May.

When comparing the weather in December and June, it's clear that the two months exhibit stark contrasts. December often brings much colder temperatures, with a minimum of -13°C (9°F) and an average of 4°C (40°F), while June enjoys milder conditions with a minimum of 7°C (46°F) and an average of 16°C (61°F). December also experiences significantly more precipitation, totaling 238 mm (9.4 in) over 19 days, compared to June's 60 mm (2.3 in) over just 9 days. Additionally, humidity levels remain high in both months, with December at 87% and June slightly lower at 83%. For a more detailed look at what to expect during the summer, check out Birch Bay weather in June.

In December, temperatures can plunge to a chilling minimum of -13°C (9°F), with an average hovering around 4°C (40°F) and a maximum reaching only 13°C (55°F). This month is characterized by significant precipitation, totaling 238 mm (9.4 in) over approximately 19 days, contributing to a high humidity level of 87%.

In stark contrast, July boasts a much warmer climate, with minimum temperatures around 10°C (51°F) and a pleasant average of 18°C (66°F), peaking at a sizzling 33°C (91°F). Rainfall is notably scarce, accumulating just 28 mm (1.1 in) over about 5 days, and the humidity remains relatively comfortable at 84%. To learn more about the delightful summer weather in Birch Bay, visit Birch Bay weather in July.

The weather in December is characterized by much colder temperatures, with a minimum of -13°C (9°F) and an average of 4°C (40°F), contrasted with the warmer conditions of August, where temperatures range from a minimum of 9°C (48°F) to a maximum of 36°C (98°F) and an average of 19°C (66°F). December also experiences higher precipitation levels at 238 mm (9.4 in) over 19 days, while August is relatively dry with only 23 mm (0.9 in) of rain across just 4 days. Additionally, humidity levels are higher in December at 87%, compared to 77% in August, creating a distinctly frosty atmosphere in winter versus the warm, humid days of summer. For more details on August weather, visit Birch Bay weather in August.

Comparing the weather between December and September reveals striking differences. December is much colder, with average temperatures hovering around 4°C (40°F) and nighttime lows plunging to -13°C (9°F). In contrast, September boasts a milder climate, featuring average temperatures of 16°C (61°F) and highs that can reach up to 33°C (91°F). Precipitation patterns also vary significantly; December experiences more rain, with about 238 mm (9.4 in) over 19 days, compared to September's 149 mm (5.9 in) over just 12 days. Additionally, December's humidity is higher at 87%, while September enjoys a lower humidity level of 76%. To learn more about the weather specifics in September, visit Birch Bay weather in September.

When comparing the weather in December and October, notable differences emerge. December is considerably colder, with average temperatures ranging from a minimum of -13°C (9°F) to a maximum of 13°C (55°F), while October offers a milder climate, with temperatures between 0°C (32°F) and 21°C (71°F). Precipitation is also more frequent in December, with 238 mm (9.4 in) falling over 19 days compared to October's 198 mm (7.8 in) over 16 days. Despite both months having high humidity, December’s 87% and October’s 88% reflect a similar dampness, though October tends to have more pleasant conditions overall. For a closer look at October's climate, check out Birch Bay weather in October.

In comparing the weather between November and December, December tends to be colder, with average temperatures ranging from a minimum of -13°C (9°F) to a maximum of 13°C (55°F), while November sees milder temperatures between -2°C (28°F) and 17°C (62°F). Although December's total precipitation is slightly less at 238 mm (9.4 in) compared to November's 296 mm (11.7 in), both months register precipitation on 19 days, suggesting a consistent rainy pattern throughout. The humidity remains the same at 87% for both months, contributing to the overall dampness experienced during this time. For a more detailed breakdown of November’s weather, you can check Birch Bay weather in November.

Compare Birch Bay's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Birch Bay

As December settles over Birch Bay, the weather takes on a distinctly brisk character, unlike the more temperate months that precede it. With cooler average temperatures hovering around 4°C (40°F) and the occasional plunge to chilling lows near -13°C (9°F), residents begin to bundle up for the season. Additionally, the month experiences increased humidity at 87% and a significant amount of precipitation, with rain falling on nearly 19 days, creating a damp and often overcast atmosphere. This shift to colder, wetter conditions marks a noteworthy transition as the area prepares for winter. For a closer look at how Birch Bay's December compares to the rest of the year, explore the full details on Birch Bay Climate.