December Weather in Sunriver, United States

Last updated: February 24, 2025

December in Sunriver, United States invites a crisp, winter wonderland atmosphere, characterized by a diverse temperature range. With maximum temperatures peaking at 17°C (63°F) and minimums plunging to a chilly -17°C (2°F), residents and visitors alike can expect to experience the full spectrum of December's chill. The average temperature hovers around 0°C (31°F), setting a serene backdrop for seasonal activities. Precipitation totals 91 mm (3.6 in) over 14 days, contributing to the region's 88% humidity that enhances the moody winter landscape. Embrace the beauty of this enchanting season as Sunriver transforms into a frosty paradise.

December Temperature in Sunriver

In December, Sunriver experiences a striking transition into winter, showcasing a minimum temperature of -17°C (2°F) that sets the stage for the colder months ahead. The average temperature hovers around 0°C (31°F), striking a balance between the chill of early winter and the occasional warmth that hints at the upcoming spring. The maximum temperature can reach 17°C (63°F), providing a brief respite from the cold and inviting outdoor activities amidst the snowy landscape. This month serves as a pivotal point in the seasonal shift, where the frost starts to take hold, yet there's still a glimmer of warmth, embodying the unique charm of Sunriver during this time of year.

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

The chart illustrates December temperature patterns in Sunriver, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec313136415058666657443731
Data source: Temperature data for Sunriver 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 Sunriver

December in Sunriver, United States, signals a transition into winter with a substantial precipitation amount of 91 mm (3.6 in), closely trailing November's 79 mm. Notably, December experiences 14 precipitation days, marking a rise in wet conditions compared to the drier summer months of just a couple of days in July. This trend highlights a shift from the minimal rainfall during the summer, where June sees only 29 mm (1.2 in), to a more active weather pattern as the year concludes. As temperatures drop, December's consistent precipitation reflects the onset of the winter season, setting the stage for the snow that often blankets the region in the coming months.

December Precipitation Trends in Sunriver

The chart displays monthly precipitation patterns in Sunriver, 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.
JanFebMarAprMayJunJulAugSepOctNovDec9511574694629101539467991
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Sunriver

In December, humidity levels in Sunriver, United States, rise to 88%, marking a notable increase as the year comes to a close. This month, along with January, February, and November, is characterized by consistently high humidity, hovering around 87% or more. The trend reveals a distinct seasonal pattern: as fall transitions into winter, humidity peaks, contrasting sharply with the drier summer months where levels dip to a mere 60% in August and 57% in September. This cyclical fluctuation underscores the region's shift from warm, dry conditions to a cooler, more humid atmosphere, encapsulating the essence of Sunriver's climate throughout the year.

December Average Humidity in Sunriver

This chart illustrates the average monthly humidity levels in Sunriver, 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.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%87%86%79%80%77%60%57%76%87%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sunriver

As December arrives in Sunriver, United States, the UV Index drops significantly to a low level of 2, resulting in a more leisurely burn time of 45 minutes. This pattern reflects a gradual decline in UV exposure as the year progresses, with the UV Index peaking in the summer months at 11 in both May and June, where caution is paramount due to the extreme exposure category. In stark contrast, the milder exposure levels in December offer a welcome respite, as you can enjoy outdoor activities with less concern for sunburn. Overall, the year showcases a clear trend of increasing UV levels through spring and summer, tapering off as winter approaches, making it essential to stay informed. For more detailed information, visit Sunriver UV Index.

Maximum UV Index Levels in Sunriver for December

The chart shows the monthly maximum UV Index (UVI) for Sunriver 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.
JanFebMarAprMayJunJulAugSepOctNovDec3578111110108642
Data source: Sunriver 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 Sunriver

In Sunriver, United States, December offers a delightful respite from the cold, boasting about 150 hours of sunshine. This falls just short of the year’s lowest in January, but it’s a notable mark in the context of an ever-brightening year. The sunshine hours steadily increase from the winter months of January and February, reaching a vibrant peak in the summer, with July basking in a remarkable 409 hours of sun. As the calendar turns back to the end of the year, December's light contrasts beautifully with the warm glow of May and June, which lead the year at 340 hours and 368 hours, respectively. This pattern highlights a significant trend: Sunriver’s sunshine builds through the seasons, offering a radiant promise for those chilly winter days.

Monthly Sunshine Duration in Sunriver: December Highlighted

The December sunshine duration represents the total number of hours Sunriver 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.
JanFebMarAprMayJunJulAugSepOctNovDec113h155h244h268h340h368h409h367h299h246h175h150h
Data source: Sunriver December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Sunriver During December

In Sunriver, United States, the likelihood of sunny weather in December takes a noticeable dip, with only a 15% chance of clear skies. This trend reflects a consistent decline in sunshine as the year progresses toward winter, contrasting sharply with the 82% and 75% probabilities seen in the vibrant summer months of July and August, respectively. The data shows that as we move from the sunnier days of spring and summer into the cooler season, the chances of bright, sunny weather dwindle significantly. Given this pattern, December is typically a time for cozy indoor activities rather than basking in the sun.

Percentage of Sunny Days in December in Sunriver

The chart illustrates the percentage of sunny days in Sunriver 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 Sunriver experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec20%24%46%60%46%65%82%75%70%35%24%15%
Data source: Sunriver December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Sunriver in December

In Sunriver, United States, December marks a notable shift in daylight duration, with only 8 hours of sunlight gracing the day. This is a part of a broader trend observed throughout the year, where daylight gradually increases from January's 9 hours to June's peak at 15 hours. As summer fades, daylight begins to wane once more, dipping back to 13 hours in August and declining to 10 hours by October. The stark contrast between the lengthy days of summer and the brisk, shorter days of winter paints a vivid picture of the region's seasonal rhythm, inviting residents and visitors alike to savor each fleeting ray as the year draws to a close.

Average Daylight Hours in Sunriver for December

The chart illustrates the variation in daylight duration in Sunriver throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 19m10h 29m11h 58m13h 28m14h 45m15h 23m15h 2m13h 53m12h 26m10h 56m9h 37m8h 56m
Data source: Sunriver daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Sunriver

As the year draws to a close, December in Sunriver brings a noticeable uptick in average wind speed, reaching 3.4 m/s (8 mph). This marks a slight increase from the generally calmer summer months, where speeds drop to their lowest in July at 2.0 m/s (4 mph). Interestingly, the fall months begin to see a resurgence in wind activity, with November matching January's 3.2 m/s (7 mph), suggesting a seasonal rhythm that peaks as winter approaches. Overall, December's winds hint at the changing seasons, intertwining the crispness of winter with the gentle reminders of nature's breath at the year's end.

Average December Wind Speed in Sunriver

The chart displays monthly wind speed patterns in Sunriver, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.23.52.82.82.52.42.02.22.22.93.23.4 m/s
Data source: Sunriver December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Sunriver Compares to Other Months

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

In December, temperatures range from a chilly -17°C (2°F) to a milder 17°C (63°F), with an average of 0°C (31°F). The month sees about 91 mm (3.6 in) of precipitation over 14 days, accompanied by high humidity levels at 88%. In contrast, January experiences even colder minimum temperatures dropping to -23°C (-9°F), while the maximum reaches only 12°C (53°F), with the average temperature remaining at 0°C (32°F). Precipitation increases slightly to 95 mm (3.7 in) over 13 days, and humidity remains quite similar at 87%. For more specific details on January conditions, check out Sunriver weather in January.

December and February present distinct weather patterns, with February generally experiencing colder temperatures. While December's minimum temperature stays around -17°C (2°F) and averages 0°C (31°F), February plunges to a lower minimum of -24°C (-11°F) but slightly warms up with an average of -1°C (31°F). Precipitation is also more frequent in February, with 114 mm (4.5 in) over 16 days compared to December's 91 mm (3.6 in) over 14 days. Despite the chill and added precipitation in February, humidity levels remain similar, with December at 88% and February at 87%. For a closer look at February weather specifics, visit Sunriver weather in February.

December and March present a notable contrast in weather patterns. In December, temperatures range from a minimum of -17°C (2°F) to a maximum of 17°C (63°F), with an average of 0°C (31°F). The month experiences a higher precipitation level of 91 mm (3.6 in) over approximately 14 days, accompanied by high humidity at 88%. In contrast, March sees slightly milder temperatures with a minimum of -14°C (6°F) and a maximum of 18°C (65°F), yielding an average temperature of 2°C (36°F). Precipitation in March averages 74 mm (2.9 in) also spread over 14 days, while humidity remains relatively stable at 87%. For more details on seasonal conditions, you can check out Sunriver weather in March.

In December, temperatures can drop to as low as -17°C (2°F), with an average of 0°C (31°F) and a maximum of 17°C (63°F). The month typically sees about 91 mm (3.6 in) of precipitation over 14 days, accompanied by high humidity levels averaging 88%. In contrast, April offers a milder climate with minimum temperatures around -11°C (12°F), an average of 5°C (42°F), and a maximum of 26°C (79°F). Precipitation in April is slightly lower at 69 mm (2.7 in) over 11 days, and the humidity remains relatively high at 86%. For more detailed information about the weather in this month, you can check Sunriver weather in April.

December and May present strikingly different weather patterns. In December, temperatures can plummet to a minimum of -17°C (2°F), with an average of 0°C (31°F) and a maximum reaching 17°C (63°F). The month sees considerable precipitation of 91 mm (3.6 in) spread over 14 days, contributing to a high humidity level of 88%. In contrast, May offers a much milder atmosphere, with temperatures ranging from a minimum of -5°C (24°F) to a pleasant maximum of 30°C (86°F) and an average of 10°C (50°F). The precipitation is less frequent, totaling 46 mm (1.8 in) over just 10 days, and the humidity decreases to a more comfortable 79%. For a closer look at May weather, check out Sunriver weather in May.

The weather in December and June presents a stark contrast, highlighting the seasonal shifts. In December, temperatures can plummet to a minimum of -17°C (2°F) with an average around 0°C (31°F), making it quite frigid. The month experiences higher humidity levels at 88%, alongside significant precipitation over 14 days totaling 91 mm (3.6 in). In contrast, June brings milder temperatures with a minimum of -2°C (29°F) and an average of 15°C (58°F), peaking at a sweltering 40°C (104°F). This month enjoys considerably less rainfall, with only 29 mm (1.2 in) over 7 days and a lower humidity level of 80%. For a closer look at what to expect, check out this link: Sunriver weather in June.

December and July present a stark contrast in weather conditions. In December, temperatures can plummet to a minimum of -17°C (2°F), with an average chill of 0°C (31°F) and a maximum of 17°C (63°F). The month is characterized by significant precipitation, totaling 91 mm (3.6 in) over approximately 14 days, along with a high humidity level of 88%. In comparison, July boasts much warmer conditions, with temperatures ranging from a minimum of 0°C (32°F) to a pleasant average of 19°C (67°F) and a peak of 35°C (95°F). Precipitation drops dramatically to just 10 mm (0.4 in) over 2 days, accompanied by a lower humidity level of 77%. For more details on what to expect, you can visit Sunriver weather in July.

When comparing the weather in December and August, there are striking differences in both temperature and precipitation patterns. December experiences much colder temperatures, with an average of 0°C (31°F) and a minimum that can plummet to -17°C (2°F), while August boasts a much warmer climate, averaging 19°C (66°F) and peaking at 36°C (98°F). Precipitation also varies significantly; December has 91 mm (3.6 in) of rain spread over 14 days, indicating a wetter month, while August is relatively dry with just 15 mm (0.6 in) over 4 days. Additionally, humidity levels are higher in December at 88%, compared to August's 60%. For more detailed insights, you can visit Sunriver weather in August.

In comparing the weather between December and September, notable differences emerge. December typically experiences chilling temperatures, ranging from a frigid minimum of -17°C (2°F) to an average of 0°C (31°F), while September enjoys more moderate conditions with a minimum of -3°C (26°F) and an average of 14°C (57°F). The maximum temperature in December peaks at 17°C (63°F), whereas September can soar to a scorching 36°C (97°F). Precipitation also varies significantly; December sees 91 mm (3.6 in) over approximately 14 days, while September has a much lighter 39 mm (1.5 in) spread across just 5 days. Additionally, humidity levels are higher in December at 88%, in contrast to September's more comfortable 57%. For further details on September weather specifics, refer to Sunriver weather in September.

In comparing the weather between December and October, it’s clear that December tends to be much colder and wetter. December’s minimum temperature can drop to a frigid -17°C (2°F), with an average of 0°C (31°F) and a maximum of 17°C (63°F), while October experiences milder conditions with a minimum of -10°C (14°F) and an average of 7°C (45°F), peaking at 29°C (84°F). Additionally, December sees significantly more precipitation, totaling 91 mm (3.6 in) over 14 days, compared to October’s 46 mm (1.8 in) across just 6 days. Humidity also trends higher in December at 88%, compared to 76% in October. For a closer look at October conditions, check out Sunriver weather in October.

In comparing the weather of December to November, both months experience similar low temperatures, with a minimum of -17°C (2°F). However, December tends to be cooler on average, with temperatures averaging around 0°C (31°F) compared to November's average of 3°C (37°F). While the maximum temperatures in both months can reach 17°C (63°F) in December and 21°C (70°F) in November, December sees slightly more precipitation at 91 mm (3.6 in) over 14 days, compared to November's 79 mm (3.1 in) over 11 days. Humidity levels are comparable, with December at 88% and November at 87%. For a more detailed look at weather conditions, you can refer to Sunriver weather in November.

Compare Sunriver's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Sunriver

As December unfolds in Sunriver, the weather takes a distinct turn, showcasing a unique charm that's both inviting and brisk. The average temperature hovers around a chilly 0°C (31°F), contrasting sharply with the warmer months, while the maximum reaches a crisp 17°C (63°F), offering fleeting moments of respite from the cold. However, it's the minimum temperature dipping to -17°C (2°F) that encapsulates winter's embrace, reminding residents to bundle up. With 91 mm (3.6 in) of precipitation over approximately 14 days, December often sees a mix of snow and rain, creating a winter wonderland that feels different from other months. The humidity level of 88% adds to the chilly atmosphere, making this month a time to appreciate the beauty of Sunriver in its frosty glory. For a deeper dive into how the weather evolves throughout the year, explore Sunriver Climate.