December Weather in Eureka, United States

Last updated: February 24, 2025

In December, Eureka, United States experiences a cool climate characterized by an average temperature of 10°C (50°F). Maximum temperatures can reach up to 17°C (63°F), while the thermometer may dip as low as 4°C (39°F) at night. This month also sees considerable precipitation, with a total of 161 mm (6.3 in) spread over 13 days, contributing to a high humidity level of 86%. Residents and visitors alike should prepare for wet and chilly conditions, making it a perfect time for cozy indoor activities while enjoying the festive season.

December Temperature in Eureka

In Eureka, United States, December brings the year to a close with cool, crisp temperatures. With a minimum of 4°C (39°F) and a maximum of 17°C (63°F), December mirrors the chill of November while maintaining an average of 10°C (50°F). This slight drop in temperature from the preceding months signals the onset of winter, making it a cozy time for residents. The consistent trend of mild winters in Eureka shines through, as temperatures generally hover in a comfortable range compared to the extremes often felt in other regions. As the cold settles in, the community engages in festive activities, embracing the serene beauty of the season.

December Weather in Eureka: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Eureka, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec504848505255565859555250
Data source: Temperature data for Eureka generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Eureka

December in Eureka brings a significant transition as the year draws to a close, with precipitation measuring 161 mm (6.3 in) over 13 rainy days. This marks a notable increase from the drier summer months, such as July and August, where hardly any rain falls. As winter sets in, December’s precipitation showcases a pattern typical for the season, positioning it as the month with the third highest rainfall of the year, following January and February. With more than half the month experiencing rain, the local landscape transforms, reflecting nature's renewal and the cycle of seasons. This abundance of moisture not only nourishes the surrounding flora but also signals the onset of the wetter months that characterize Eureka's climate.

December Precipitation Trends in Eureka

The chart displays monthly precipitation patterns in Eureka, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2112001641016024772753117161
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Eureka

In Eureka, United States, December marks a transition where humidity levels begin to rise again after the drier summer months. With a humidity of 86%, December experiences the second highest levels of moisture in the year, closely following November's peak of 87%. This uptick in humidity highlights a noticeable seasonal pattern; as the year progresses from the balmy 60% in August to the heavy dampness of late fall and winter, residents can expect a shift towards a cooler and moister climate. Noteworthy is the contrast between summer's lighter touch and the return of the wetter conditions toward the year's end, demonstrating Eureka's unique coastal climate influences.

December Average Humidity in Eureka

This chart illustrates the average monthly humidity levels in Eureka, 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%85%82%81%79%70%60%62%72%87%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Eureka

As winter settles in, Eureka experiences a notable dip in UV index levels. In December, the UV Index stands at a mere 2, categorizing it as low and allowing for a considerably safer outdoor experience with a burn time extending up to 45 minutes. This marks a significant decrease from the previous months, where indices peaked in the summer with figures as high as 11. The trend clearly shows how UV exposure dramatically lessens as the year winds down, particularly compared to the very high and extreme levels encountered in mid-summer. For more details on UV exposure in Eureka throughout the year, visit Eureka UV Index.

Maximum UV Index Levels in Eureka for December

The chart shows the monthly maximum UV Index (UVI) for Eureka 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.
JanFebMarAprMayJunJulAugSepOctNovDec3478101110108642
Data source: Eureka 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 Eureka

As December unfolds in Eureka, United States, residents enjoy a cozy 159 hours of sunshine, a modest drop following the more radiant months of summer. This gradual decline in sunlight begins after the peak of 394 hours in July, showcasing a distinct seasonal rhythm. The shift from the abundant light of May's 334 hours down to December's 159 highlights the natural transition towards winter. While winter brings shorter days, it also offers a unique charm; the crisp air and soft glow of the sun during December can be invigorating. This month’s sunshine, though less than the summer swells, creates a beautiful backdrop for holiday festivities and winter nature walks, perfectly capturing the essence of the season.

Monthly Sunshine Duration in Eureka: December Highlighted

The December sunshine duration represents the total number of hours Eureka 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.
JanFebMarAprMayJunJulAugSepOctNovDec118h184h243h274h334h370h394h355h300h268h201h159h
Data source: Eureka December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Eureka During December

In Eureka, December experiences a 28% chance of sunny weather, a trend that reflects a significant dip compared to the sunnier months of late summer and early fall, when the likelihood peaks at 60% and 62% in August and September, respectively. As the year progresses, the chances of sunshine decline, with winter months like November and December showcasing the least probability of sun, both hovering around 28-31%. Overall, while winter can often be drab and grey, December's weather pattern is consistent with a broader trend of diminishing sunlight as the year draws to a close.

Percentage of Sunny Days in December in Eureka

The chart illustrates the percentage of sunny days in Eureka 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 Eureka experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec28%38%51%49%49%46%52%60%63%42%31%28%
Data source: Eureka December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Eureka in December

In Eureka, the ebb and flow of daylight throughout the year creates a rhythmic cycle that beautifully marks the changing seasons. As winter grips the month of December, daylight is limited to just 9 hours—a duration that mirrors the shorter days of January and November. This consistent brevity serves as a stark contrast to the longest days of June, which stretch to 15 hours. Following this peak, daylight begins to wane gradually through the summer and fall, with July and August seeing 14 and 13 hours respectively before descending further into the winter months. With each passing month, Eureka transitions from the vibrant brightness of spring to the tranquil dimness of winter, creating a captivating tapestry of light that reflects the beauty of nature’s cycle.

Average Daylight Hours in Eureka for December

The chart illustrates the variation in daylight duration in Eureka throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 36m10h 39m11h 58m13h 20m14h 28m15h 2m14h 43m13h 42m12h 24m11h 3m9h 52m9h 16m
Data source: Eureka daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Eureka

In Eureka, United States, the winds of December bring a refreshing change, with an average speed of 4.4 m/s (10 mph). This month marks a slight uptick from the calmer breezes of November, which averaged 3.7 m/s (8 mph). Throughout the year, wind speeds tend to fluctuate, peaking in March at 5.2 m/s (12 mph) before entering a seasonal lull during the summer months. As the year winds down, December's winds reflect an upward trend compared to the preceding months, suggesting a return of vigor as winter approaches. This pattern hints at the coastal dynamics that play a pivotal role in shaping Eureka's charming yet ever-changing climate.

Average December Wind Speed in Eureka

The chart displays monthly wind speed patterns in Eureka, 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.
JanFebMarAprMayJunJulAugSepOctNovDec5.05.15.23.94.83.73.83.83.24.43.74.4 m/s
Data source: Eureka December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Eureka Compares to Other Months

The weather in Eureka 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 Eureka and find detailed weather information for every month.

In both December and January, temperatures remain quite consistent, with minimums at 4°C (39°F), averages around 10°C (50°F), and maximums reaching up to 17°C (63°F). However, January experiences a noticeable increase in precipitation, totaling 211 mm (8.3 in) over 15 days, compared to December’s 161 mm (6.3 in) across 13 days. Humidity levels remain stable at 86% for both months, contributing to a consistently damp atmosphere. For more detailed insights, you can check Eureka weather in January.

In comparing the weather between December and February, both months exhibit mild temperatures, but February tends to be slightly cooler on average. December records minimum temperatures of 4°C (39°F) and average highs of 17°C (63°F), while February starts with a minimum of 3°C (37°F) and reaches a maximum of 19°C (66°F). Precipitation is more frequent in February, totaling 200 mm (7.9 in) over 14 days, compared to December’s 161 mm (6.3 in) over 13 days. Humidity remains relatively consistent, with December at 86% and February slightly lower at 85%. For a more detailed look at February's weather in Eureka, check out Eureka weather in February.

December and March showcase similar temperature ranges, with both months experiencing a maximum of 17°C (63°F). December tends to be slightly warmer on average at 10°C (50°F), compared to March's average of 9°C (49°F). Precipitation levels are quite comparable, with December seeing 161 mm (6.3 in) over 13 days and March having slightly more at 164 mm (6.5 in) across 15 days. Humidity levels are also similar, with December at 86% and March at 85%. Overall, both months present a cool and wet climate, making the transition from winter to spring noticeable. For more detailed insights on March weather, check out Eureka weather in March.

December and April exhibit notable differences in weather patterns. In December, temperatures range from a minimum of 4°C (39°F) to a maximum of 17°C (63°F), with an average temperature of 10°C (50°F). The month is characterized by significant precipitation, totaling 161 mm (6.3 in) over 13 days, and high humidity at 86%. In contrast, April experiences slightly warmer conditions with temperatures ranging from 5°C (41°F) to 18°C (65°F), maintaining the same average temperature of 10°C (51°F). Precipitation in April is less intense, with 101 mm (4.0 in) spread across 10 days and lower humidity at 82%. For more detailed insights, check out Eureka weather in April.

December and May present distinctly different weather patterns. In December, temperatures range from a minimum of 4°C (39°F) to a maximum of 17°C (63°F), with an average of 10°C (50°F). This month also sees significant rainfall, with approximately 161 mm (6.3 in) over 13 days, contributing to a higher humidity level of 86%. In contrast, May experiences slightly warmer conditions, with minimum temperatures at 6°C (43°F) and an average rising to 11°C (52°F), yet it maintains the same maximum of 17°C (63°F). Precipitation in May drops significantly to about 60 mm (2.4 in) over just 6 days, accompanied by a lower humidity of 81%. For a detailed view of weather conditions during May, you can check Eureka weather in May.

December and June exhibit contrasting weather patterns. In December, temperatures range from a chilly 4°C (39°F) to a more moderate 17°C (63°F), with an average of 10°C (50°F). The month is characterized by significant rainfall, with 161 mm (6.3 in) of precipitation over 13 days, contributing to a high humidity level of 86%. In stark contrast, June brings milder temperatures, with a minimum of 9°C (48°F) and a maximum of 23°C (74°F), averaging 13°C (55°F). Rainfall drops dramatically to just 23 mm (0.9 in) across only 4 days, and humidity decreases to 79%. For more specific details about June weather, check out Eureka weather in June.

December weather is characterized by cooler temperatures, with an average of 10°C (50°F) and maximums reaching only 17°C (63°F). The month sees significant precipitation, averaging 161 mm (6.3 in) over approximately 13 days, and high humidity levels at 86%. In contrast, July offers milder conditions with a higher minimum temperature of 9°C (49°F) and an average of 13°C (56°F), reaching up to 19°C (66°F). Moreover, July is notably drier, with only 7 mm (0.3 in) of rain recorded over just 1 day and a more comfortable humidity level of 70%. For a more detailed overview, check out Eureka weather in July.

In December, the weather is notably cooler, with average temperatures ranging from a minimum of 4°C (39°F) to a maximum of 17°C (63°F), accompanied by frequent precipitation totaling 161 mm (6.3 in) over 13 days, resulting in high humidity levels of 86%. In contrast, August offers a milder climate with temperatures varying from a minimum of 10°C (51°F) to a maximum of 23°C (74°F). This month sees significantly less rainfall, only about 7 mm (0.3 in) across zero rainy days, and a lower humidity level of 60%. For more details on August weather conditions, you can check Eureka weather in August.

In comparing the weather of December and September, notable differences emerge. December experiences cooler temperatures, with a minimum of around 4°C (39°F) and an average of 10°C (50°F), while September offers a much warmer climate, featuring a minimum of 10°C (50°F) and an average of 15°C (59°F). The maximum temperatures in September can reach up to 29°C (84°F), significantly higher than December's peak of 17°C (63°F). Additionally, December is characterized by much higher precipitation, totaling 161 mm (6.3 in) over 13 rainy days, compared to a mere 27 mm (1.0 in) over just 3 days in September. Humidity levels also reflect this variation, with December averaging 86% and September at a more comfortable 62%. For more detailed information, you can check out Eureka weather in September.

In comparing the weather conditions of December and October, December tends to be cooler with average temperatures ranging from a minimum of 4°C (39°F) to a maximum of 17°C (63°F), while October features milder temperatures, with averages from 8°C (46°F) to 22°C (72°F). Additionally, December experiences significantly higher precipitation, totaling 161 mm (6.3 in) over 13 days, compared to October's 53 mm (2.1 in) over just 5 days. The humidity also rises in December to 86%, which is notably higher than October's average of 72%. For more information on October weather specifically, see Eureka weather in October.

When comparing the weather in December to November, both months experience similar minimum temperatures, averaging around 4°C (39°F). However, November tends to be slightly warmer on average, with a mean temperature of 11°C (52°F) compared to December's 10°C (50°F). Additionally, November enjoys higher maximum temperatures, reaching up to 19°C (66°F) versus December's maximum of 17°C (63°F). Precipitation is notably higher in December, with 161 mm (6.3 in) spread over 13 days, compared to November's 117 mm (4.6 in) over 10 days. Humidity remains relatively constant, hovering around 86% in December and 87% in November. For more details, you can check out Eureka weather in November.

Compare Eureka's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Eureka

As December approaches in Eureka, the chill of winter becomes more pronounced, setting it apart from the milder autumn months. With an average temperature of 10°C (50°F) and increasing humidity at 86%, residents and visitors can expect a notable drop in warmth compared to earlier in the year. December is also characterized by its higher precipitation, with about 13 days of rain contributing to a total of 161 mm (6.3 in), making it one of the wetter months. This combination of cooler temperatures and increased moisture creates a distinctly festive atmosphere, perfect for cozy gatherings. To learn more about year-round weather patterns in this coastal town, visit Eureka Climate.