December Weather in Shasta, United States

Last updated: February 24, 2025

Experience the diverse weather of Shasta, United States, in December, where temperatures range from a maximum of 22°C (73°F) to a minimum of -1°C (30°F), averaging a cool 8°C (46°F). With 149 mm (5.9 in) of precipitation spread over 11 days, December brings a blend of rain and chilly winds, contributing to an impressive humidity level of 86%. Whether you enjoy crisp mornings or the cozy atmosphere of winter rain, Shasta offers a refreshing winter experience for all.

December Temperature in Shasta

In Shasta, United States, December marks a transitional period as temperatures begin to dip in preparation for winter. With minimums around -1°C (30°F) and average highs reaching 22°C (73°F), the month offers a mix of cool and mild days. The holiday season's chilly ambiance is reflected in the sharp contrast between the low and high temperatures, reminiscent of early winter while still hinting at the warmth of the coming months. As the holidays approach, residents can expect cozy, crisp days that provide the perfect backdrop for festivities, while the average temperature of 8°C (46°F) keeps things comfortably brisk. This blend of cold nights and mild afternoons sets the stage for a picturesque December, capturing the essence of winter without plunging into the deeper cold that characterizes January and February.

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

The chart illustrates December temperature patterns in Shasta, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec474952596778858375635346
Data source: Temperature data for Shasta 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 Shasta

In Shasta, United States, December marks a significant uptick in precipitation, bringing an average of 149 mm (5.9 in) this month, which contributes to a wetter trend toward the year's end. With 11 rainy days, December maintains a consistent rhythm of moisture, following the previous month's rainfall of 123 mm (4.8 in) over 7 days. This gradual increase from November to December hints at the onset of winter, setting the stage for an even wetter January, which typically sees the highest precipitation of the year. Overall, the data shows that as the year closes, Shasta experiences a marked shift towards more frequent and substantial rainfall, essential for replenishing water resources in the region.

December Precipitation Trends in Shasta

The chart displays monthly precipitation patterns in Shasta, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2131921879259812966123149
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Shasta

In Shasta, United States, December experiences a humidity level of 86%, maintaining a trend of high moisture similar to the month's preceding November, which recorded 87%. As we look back through the year, winter months typically hover around 85-86%, providing a stark contrast to the drier summer period, where levels plummet to around 60-70% in July and August. This seasonal fluctuation not only underscores the region's cooling climate in winter but also highlights how the air retains its moisture in the colder months, preparing for the seasonal shifts that define life in Shasta.

December Average Humidity in Shasta

This chart illustrates the average monthly humidity levels in Shasta, 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 Shasta

In Shasta, United States, the UV Index sees a noticeable drop in December, reaching a level of 2, which falls into the low exposure category. This signifies a decreased risk of harm from unprotected sun exposure, allowing for a longer burn time of 45 minutes—a welcome contrast to the intense rays of summer months. As the year progresses, the UV Index peaks dramatically in mid-summer, showcasing a shift from moderate levels in the winter to extreme in June, with a swift transition toward high levels by March. Overall, the trend reveals a seasonal fluctuation where residents can enjoy the outdoors longer during December without the worry of severe sunburn, making it an ideal time for outdoor activities. For more information, visit Shasta UV Index.

Maximum UV Index Levels in Shasta for December

The chart shows the monthly maximum UV Index (UVI) for Shasta 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.
JanFebMarAprMayJunJulAugSepOctNovDec3478101110109642
Data source: Shasta 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 Shasta

As the year draws to a close, December in Shasta, United States, brings a gentle reduction in sunlight, with around 170 hours gracing the area. This decline follows a remarkable ascent through the warmer months, peaking in July with 401 hours of glorious sunshine. Transitioning from the lushness of spring, where April and May boast significant daylight, the season gradually shifts toward shorter days. While December doesn’t bask in the abundant light of earlier months, its cool and crisp atmosphere still offers moments of warmth, inviting residents and visitors alike to embrace the unique charm this time of year presents. The evident seasonal trend highlights the rhythmic dance of daylight, underscoring the beauty of Shasta throughout the changing seasons.

Monthly Sunshine Duration in Shasta: December Highlighted

The December sunshine duration represents the total number of hours Shasta 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.
JanFebMarAprMayJunJulAugSepOctNovDec126h194h241h293h359h388h401h354h312h279h209h170h
Data source: Shasta December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Shasta During December

In Shasta, United States, the likelihood of enjoying sunny weather sees a notable trajectory as the year progresses. Starting at a modest 32% in January, the chances steadily climb, peaking in August with a remarkable 91%. However, as we transition to the end of the year, the trend shifts; December experiences a dip to 38%, signaling a return to cloudier conditions akin to those in November with a 45% chance of sunshine. This pattern underscores the region's characteristic shift from the bright summer months to a cooler, more overcast winter season. So while sunshine may be less frequent in December, it remains a charming time to embrace the fading rays before the winter chill fully sets in.

Percentage of Sunny Days in December in Shasta

The chart illustrates the percentage of sunny days in Shasta 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 Shasta experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec32%54%60%74%79%83%86%91%82%50%45%38%
Data source: Shasta December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Shasta in December

As December unfolds in Shasta, United States, residents experience a return to shorter days, with daylight lasting just 9 hours. This pattern echoes the daylight duration seen in November, creating a consistent trend of reduced sunlight during the winter months. The months preceding December, particularly from March to June, showcase an upward trajectory, where daylight peaks at a generous 15 hours in June. Following this climax, July begins a gradual descent back to shorter days, mirroring the trend observed at the year's start in January. This cyclical rhythm of daylight not only marks the changing seasons but also invites the community to embrace the cozy, reflective nature of winter as sunlight gradually retreats.

Average Daylight Hours in Shasta for December

The chart illustrates the variation in daylight duration in Shasta throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 38m10h 40m11h 58m13h 19m14h 27m15h14h 42m13h 41m12h 24m11h 3m9h 53m9h 18m
Data source: Shasta daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Shasta

As December settles over Shasta, the average wind speed dips to a gentle 1.9 m/s (4 mph), marking a subtle decline from the slightly breezier months of spring and early summer. Throughout the year, the winds reveal a pattern of mild fluctuations; with the highest average speeds peaking at 2.5 m/s (6 mph) in May before tapering off. March maintains a moderate pace at 2.3 m/s, while the summer months of July and August see a retraction to 2.0 m/s (5 mph), creating a serene atmosphere ideal for cozy winter days. As the year closes, the softening gusts remind us of the tranquil charm this season brings to the landscape, setting a perfect scene for reflection and warmth.

Average December Wind Speed in Shasta

The chart displays monthly wind speed patterns in Shasta, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2.02.22.32.22.52.22.02.02.02.12.01.9 m/s
Data source: Shasta December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Shasta Compares to Other Months

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

In December, the weather features a relatively mild average temperature of 8°C (46°F), with minimal lows around -1°C (30°F) and daytime highs reaching up to 22°C (73°F). The month experiences a total precipitation of 149 mm (5.9 in) over 11 days, maintaining high humidity levels at 86%. In contrast, January sees slightly cooler temperatures, with minimums dropping to -3°C (27°F) and a similar average of 8°C (47°F). However, the maximum temperature reaches a bit lower at 21°C (70°F). Rainfall increases to 213 mm (8.4 in), with precipitation occurring on 12 days, while humidity remains steady at 86%. For more details on the weather conditions, you can check out Shasta weather in January.

In comparing the weather of December and February, we see some notable differences. December typically presents a milder temperature range with a minimum of -1°C (30°F) and an average of 8°C (46°F), while February generally starts a bit colder with a minimum of -3°C (27°F), although it can reach a higher maximum temperature of 27°C (81°F). Precipitation levels also vary, with December receiving 149 mm (5.9 in) over 11 days, whereas February gets slightly more with 192 mm (7.5 in) over just 9 days. Humidity remains relatively consistent between the two months, hovering around 86% in December and 85% in February. For more specifics about February's conditions, check out Shasta weather in February.

December and March present distinct weather patterns, with December being characterized by cooler temperatures ranging from a minimum of -1°C (30°F) to a maximum of 22°C (73°F) and an average of 8°C (46°F). The month sees considerable precipitation, totaling 149 mm (5.9 in) over about 11 days, along with high humidity levels at 86%. In contrast, March experiences slightly warmer temperatures, with minimums around 0°C (32°F), averages of 11°C (52°F), and maximums peaking at 27°C (81°F). Precipitation increases to 187 mm (7.4 in) over roughly 14 days, maintaining a humidity level of 85%. For more specific weather details, you can check Shasta weather in March.

In December, temperatures range from a chilly minimum of -1°C (30°F) to a maximum of 22°C (73°F), with an average temperature of 8°C (46°F). This month experiences significant precipitation, totaling 149 mm (5.9 in) over about 11 days, and high humidity at 86%. In contrast, April sees milder temperatures, with a minimum of 1°C (35°F) and a warm maximum of 33°C (91°F), averaging 15°C (59°F). Precipitation in April drops to 92 mm (3.6 in) over 8 days, alongside slightly lower humidity at 82%. For a closer look at what to expect, check out Shasta weather in April.

December and May present contrasting weather profiles. In December, temperatures can drop to a chilly min of -1°C (30°F) and average around 8°C (46°F), peaking at a maximum of 22°C (73°F). The month is also characterized by higher precipitation, with 149 mm (5.9 in) falling over approximately 11 days and a humidity level of 86%. In stark comparison, May experiences milder temperatures, starting at a minimum of 3°C (38°F) and averaging a pleasant 20°C (68°F), reaching maximum temperatures of 38°C (101°F). Additionally, May sees significantly lower precipitation of 59 mm (2.3 in) over about 5 days, with humidity slightly lower at 81%. For more specific details on Shasta's climate during this month, check out Shasta weather in May.

December and June present strikingly different weather conditions. In December, temperatures range from a chilly minimum of -1°C (30°F) to a warm maximum of 22°C (73°F), with an average of 8°C (46°F). This month also sees considerable precipitation, with about 149 mm (5.9 in) falling over 11 days, paired with high humidity at 86%. In contrast, June offers a much warmer climate, featuring a minimum temperature of 8°C (47°F) and soaring maximums up to 43°C (109°F), with an average of 25°C (78°F). Precipitation is minimal during this month, totaling only 8 mm (0.3 in) across just a single day, and the humidity drops slightly to 79%. For more detailed information, check out Shasta weather in June.

December and July present starkly contrasting weather conditions. In December, temperatures range from a chilly -1°C (30°F) at night to a mild 22°C (73°F) during the day, with an average of 8°C (46°F). This month also experiences significant rainfall, with 149 mm (5.9 in) spread over 11 days, resulting in a high humidity level of 86%. In contrast, July boasts much warmer temperatures, with a minimum of 16°C (61°F) and a scorching maximum of 44°C (111°F), averaging 30°C (86°F). This summer month is notably dry, receiving only 1 mm (0.0 in) of precipitation with no rainy days, and a lower humidity of 70%. For more detailed insights into July's weather, visit Shasta weather in July.

December and August present starkly contrasting weather conditions. In December, temperatures range from a chilly minimum of -1°C (30°F) to a moderate maximum of 22°C (73°F), with an average of 8°C (46°F). This month also boasts high humidity at 86% and notable precipitation, averaging 149 mm (5.9 in) over 11 days. Conversely, August offers a much warmer climate, with temperatures ranging from a minimum of 15°C (59°F) to a scorching maximum of 44°C (112°F), averaging 28°C (83°F). Precipitation is virtually nonexistent, registering only 2 mm (0.1 in) and no rainy days, alongside a lower humidity level of 60%. For more details on August weather, you can check Shasta weather in August.

When comparing the weather in December to that of September, it's clear that December experiences significantly cooler temperatures, with minimums dropping to -1°C (30°F) and an average of 8°C (46°F), while September sees much warmer conditions, featuring a minimum of 7°C (44°F) and an average high of 24°C (75°F). Precipitation also differs dramatically; December receives about 149 mm (5.9 in) over 11 days, in stark contrast to September, which has just 9 mm (0.3 in) of rain on only one day. Additionally, December's humidity is considerably higher at 86%, compared to September's 62%, highlighting the more comfortable, drier conditions typical of early autumn. For more insights on September weather, check out Shasta weather in September.

When comparing the weather in December and October, notable differences emerge. December tends to be colder, with temperatures ranging from a minimum of -1°C (30°F) to a maximum of 22°C (73°F), averaging around 8°C (46°F). In contrast, October offers milder conditions, with minimum temperatures at 5°C (41°F) and a maximum reaching an impressive 38°C (101°F), averaging 17°C (64°F). Additionally, December experiences much higher precipitation, totaling 149 mm (5.9 in) over 11 days, while October has significantly less, with 66 mm (2.6 in) over just 4 days. The humidity level also rises in December to 86%, compared to 72% in October, making December feel noticeably damper. For more insights into the weather specifics, check out Shasta weather in October.

In December, temperatures range from a minimum of -1°C (30°F) to a maximum of 22°C (73°F), with an average of 8°C (46°F). This month experiences increased precipitation of 149 mm (5.9 in) over 11 days, along with high humidity at 86%. In contrast, November features slightly warmer temperatures, with a minimum of -1°C (31°F) and a maximum of 29°C (84°F), while the average sits at 12°C (54°F). Precipitation is lower at 123 mm (4.8 in) across 7 days, and the humidity is comparable at 87%. Overall, December is cooler and wetter than November, making for a distinctly different weather experience. For more details, check out Shasta weather in November.

Compare Shasta's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Shasta

December in Shasta ushers in a distinct change from the rest of the year, characterized by its cool temperatures and increased precipitation. While the average temperature dips to a brisk 8°C (46°F), the month encounters some of the region's highest humidity levels at 86%, setting the stage for a chilly and damp atmosphere. With about 11 days of rainfall accumulating to 149 mm (5.9 in), this month stands out for its moisture, making it a stark contrast to the drier seasons. For more insights into how December weather shapes the overall climate of Shasta, explore Shasta Climate.