Last updated: February 24, 2025
In Carlsbad, United States, December showcases a diverse range of weather conditions, with a maximum temperature reaching 27°C (80°F) and a notably cool average of 9°C (49°F). The month can experience chilly nights, with temperatures dipping to a brisk -5°C (23°F). Despite the comfortable daytime warmth, residents can expect occasional precipitation, totaling 7 mm (0.3 in) over just a single day, all while humidity levels hover around a significant 80%. This blend of mild warmth and cooler nights makes December a unique month in Carlsbad's climate calendar.
In Carlsbad, United States, December temperatures exhibit a notable chill as winter takes hold. With minimums dropping to -5°C (23°F), days are brisk and crisp, yet the average temperature hovers around 9°C (49°F), offering a refreshing contrast against the frosty mornings. As the sun rises, temperatures can soar to a maximum of 27°C (80°F), reminding us of the region's ability to surprise with warmer spells even in the cooler month. This blend of cool and mild weather trends sets December apart, providing a unique winter experience that encourages both outdoor exploration and cozy indoor moments.
In December, Carlsbad experiences a notable dip in precipitation, recording just 7 mm (0.3 in) of rain over a mere single day. This reduction continues the downward trend from the wetter months earlier in the year, where rainfall peaked in August with 34 mm (1.3 in) across five days, and notably October, with 31 mm (1.2 in) over three days. The relatively low precipitation in December signals the arrival of drier winter conditions that characterize much of the late year in this region. As the final month of the calendar year, December wraps up a cycle of varied rainfall, with a gradual decrease from the wetter mid-year months, suggesting that residents should enjoy the sunshine while it lasts!
In Carlsbad, December's humidity tends to hover around 80%, marking a slight decrease from the preceding month's 82%. This period of the year reflects a transitional trend, as humidity levels gradually drop from the peak experienced in November. Throughout the year, the coastal climate showcases a relatively stable humidity range, with the highest averages seen during the winter months, particularly in late fall. Throughout the year, humidity fluctuates, peaking in November, before settling into the lower 60s by springtime. The consistent moisture levels contribute to the region's lush environment, making Carlsbad an attractive destination for nature lovers and those seeking mild, humid winters.
In Carlsbad, the UV Index sees a significant decline as the year comes to a close, dropping to 5 in December, which falls into the moderate exposure category. This marks a departure from the intense extreme and very high levels experienced during the summer months, where the Index peaked at a staggering 13 in June. With burn times shortening dramatically as the seasons change—plummeting to just 10 minutes during the peak summer months—residents can enjoy more leisurely outdoor activities throughout December with a safer 30-minute burn time. As the UV Index stabilizes to a more manageable level, it’s a reminder for everyone to stay mindful of sun safety year-round. For more insights on UV levels, visit Carlsbad UV Index.
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In Carlsbad, December wraps up the year with 258 hours of sunshine, marking a gentle decline from the sun-kissed days of summer. The trend throughout the year reveals a lively performance in the earlier months, peaking at 370 hours in July before beginning a gradual descent. This consistent sunshine makes Carlsbad an attractive destination, particularly in spring when hours reach a delightful 364 in May and 322 in April. Even as temperatures cool, December still offers a bright retreat, comfortably nestled above winter months seen in other regions. The overall sunshine pattern not only underscores Carlsbad's appeal but also provides a charming backdrop for holiday celebrations amidst the golden rays.
In Carlsbad, the likelihood of sunny weather in December stands at 60%, which is relatively moderate compared to other months. Notably, this figure trails the peak sunshine probability seen in October at an impressive 87%. December's sunshine rates, however, bridge a significant gap between the sunnier late months and the early winter, aligning closely with the percentages recorded in April and May. As the year winds down, December's sun chances reflect a seasonal transition, inviting residents and visitors alike to enjoy the mild weather amidst evolving landscapes. Despite being one of the cooler months, the 60% chance of sun indicates that there's still a good opportunity to bask in Carlsbad’s natural beauty during the holiday season.
In December, Carlsbad, United States, experiences a consistent 10 hours of daylight, mirroring the shorter days of November. As the year reaches its end, daylight hours peak during the summer months of June and July, where residents enjoy a generous 14 hours of sunlight, gradually tapering off into the winter. The trend shows a steady increase in daylight from the depths of winter in December through the spring months, culminating in the lush brightness of May. Once summer departs, daylight begins its descent again, creating a rhythmic cycle of light that resonates through the seasons. This ebb and flow not only shapes daily activities but also reflects the natural beauty that Carlsbad has to offer throughout the year.
As December sweeps into Carlsbad, the winds pick up slightly, averaging 4.2 m/s (9 mph), a noticeable increase from the calmer months leading up to it. Unlike the breezy summer days when July's winds dipped to a gentle 2.8 m/s (6 mph), December's gusts herald the shift toward winter, bringing an invigorating chill to the coastal air. This month marks a return to more robust winds, surpassing the lows of both November and July, and reflecting a broader trend of seasonal variation where the wind speed tends to peak in the spring and early summer. Whether you’re strolling along the shoreline or enjoying outdoor festivities, December's winds in Carlsbad add a fresh dimension to the season, encouraging both locals and visitors to embrace the invigorating shift in the coastal climate.
The weather in Carlsbad 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 Carlsbad and find detailed weather information for every month.
In December, temperatures in Carlsbad typically range from a minimum of -5°C (23°F) to a maximum of 27°C (80°F), with an average of 9°C (49°F). The month experiences minimal precipitation, totaling just 7 mm (0.3 in) over about 1 day, alongside relatively high humidity at 80%. In contrast, January sees a slight drop in temperatures, with minimums reaching -10°C (15°F) and an average of 8°C (46°F), while still peaking at 27°C (80°F). Precipitation increases to 12 mm (0.5 in) over 2 days, and humidity decreases to 75%. For more detailed insights, check out Carlsbad weather in January.
In December, the weather in Carlsbad is relatively mild, with average temperatures ranging from a minimum of -5°C (23°F) to a maximum of 27°C (80°F), accompanied by high humidity at 80%. Rain is infrequent, with only 7 mm (0.3 in) of precipitation over just a single day.
In contrast, February brings colder temperatures, with a minimum dipping down to -15°C (6°F) but still achieving an average of 10°C (50°F) and a maximum reaching 31°C (88°F). Precipitation increases slightly to 11 mm (0.4 in), but remains consistent with just one rainy day, while humidity decreases to 74%. For a more detailed look at February weather patterns, you can refer to Carlsbad weather in February.
When comparing the weather of December and March, notable differences emerge. December experiences a milder average temperature of 9°C (49°F), with maximums reaching 27°C (80°F), accompanied by a high humidity level of 80%. Precipitation is minimal, with only 7 mm (0.3 in) falling over just one day. In contrast, March sees a more significant increase in temperature, with an average of 15°C (59°F) and maximums soaring to 34°C (93°F). However, this month also brings more rainfall, totaling 24 mm (0.9 in) over three days, while humidity decreases to 61%. For more details on March weather specifically, visit Carlsbad weather in March.
In December, the weather is quite cool, with temperatures ranging from a minimum of -5°C (23°F) to a maximum of 27°C (80°F), and an average of 9°C (49°F). The month is characterized by high humidity at 80% and limited precipitation, averaging just 7 mm (0.3 in) over one day. In stark contrast, April experiences significantly warmer conditions, with temperatures fluctuating between 3°C (37°F) and a high of 36°C (97°F), averaging around 20°C (67°F). Despite slightly higher precipitation at 12 mm (0.5 in) over one day, humidity drops to a more comfortable 61%. To learn more about the weather specifics in April, visit Carlsbad weather in April.
In December, temperatures range from a chilly -5°C (23°F) to a mild 27°C (80°F), with an average of 9°C (49°F). The month sees only about 7 mm (0.3 in) of precipitation on just one day, resulting in a high humidity level of 80%. In contrast, May offers significantly warmer weather, with temperatures varying from a minimum of 4°C (39°F) to a scorching maximum of 40°C (104°F), and an average temperature of 25°C (77°F). Although precipitation does increase slightly to 11 mm (0.4 in) over three days, the humidity drops to 67%, making May feel much more comfortable. For a detailed look at the weather in May, visit Carlsbad weather in May.
In December, temperatures range significantly, with minimums dropping to -5°C (23°F) and averages around 9°C (49°F), contrasted by maximums reaching 27°C (80°F). The month experiences relatively low precipitation at 7 mm (0.3 in) over just one rainy day, coupled with high humidity at 80%. In stark contrast, June boasts much warmer temperatures, with minimums starting at 14°C (58°F) and average highs soaring to 29°C (84°F), occasionally peaking at a scorching 42°C (109°F). The month also sees increased precipitation, totaling 29 mm (1.1 in) across three days, but with lower humidity at 69%. For more in-depth details about June weather, visit Carlsbad weather in June.
In December, the weather is quite chilly, with temperatures ranging from a minimum of -5°C (23°F) to a pleasant average of 9°C (49°F) and a maximum of 27°C (80°F). Despite the low temperatures, precipitation is minimal, averaging only 7 mm (0.3 in) over just one day, accompanied by high humidity at 80%. In contrast, July brings much warmer conditions, with minimum temperatures around 18°C (65°F) and averaging a balmy 29°C (85°F), peaking at a scorching 44°C (111°F). Rainfall increases in July, with about 23 mm (0.9 in) spread across four days, and humidity is lower at 69%. For a more detailed look at July weather, check out Carlsbad weather in July.
December and August present strikingly different weather patterns. In December, temperatures range from a chilly minimum of -5°C (23°F) to a comfortable maximum of 27°C (80°F), with an average of 9°C (49°F). The month sees minimal precipitation, totaling just 7 mm (0.3 in) over only one day, coupled with a high humidity level of 80%. In contrast, August offers much warmer conditions, with temperatures starting at a minimum of 17°C (63°F) and peaking at an impressive 43°C (109°F), averaging 29°C (84°F). This summer month experiences considerably more rain, accumulating 34 mm (1.3 in) over approximately five days, and has a lower humidity of 66%. For more details on Carlsbad’s weather in August, you can visit Carlsbad weather in August.
In December, temperatures can range from a chilly -5°C (23°F) to a mild 27°C (80°F), with an average of 9°C (49°F). The month sees minimal precipitation, averaging just 7 mm (0.3 in) over about one day, and the humidity is fairly high at 80%. In contrast, September enjoys much warmer weather, with minimum temperatures of 8°C (47°F) and maximums soaring to 38°C (101°F), leading to an average of 25°C (78°F). This month experiences more rainfall, with about 29 mm (1.1 in) over approximately six days, alongside a lower humidity level of 71%. For a detailed look at September weather, check Carlsbad weather in September.
December weather tends to be noticeably cooler than October, with average temperatures ranging from a minimum of -5°C (23°F) to a maximum of 27°C (80°F). In contrast, October boasts warmer averages, with temperatures stretching from a minimum of -3°C (28°F) to a high of 36°C (97°F). Precipitation levels also differ significantly, with December receiving only 7 mm (0.3 in) over just one day, whereas October experiences 31 mm (1.2 in) spread across three days. Additionally, December's humidity is higher at 80%, compared to October's more comfortable 71%. For more specific details about temperatures and conditions, you can refer to Carlsbad weather in October.
When comparing the weather in December to November, December shows a slight decrease in average temperatures, with a minimum of -5°C (23°F) and a maximum of 27°C (80°F), compared to November's minimum of -4°C (25°F) and maximum of 31°C (88°F). Additionally, December experiences less precipitation, recording only 7 mm (0.3 in) over 1 day, while November has 16 mm (0.6 in) over 2 days. Humidity remains relatively stable, with December at 80% and November slightly higher at 82%. For more details on November's climate, you can check Carlsbad weather in November.
In December, Carlsbad experiences a notable shift in weather compared to other months, with cooler temperatures that average around 9°C (49°F) and the occasional dip to as low as -5°C (23°F). While the maximum temperature can still reach a pleasant 27°C (80°F), the cold nights contrast sharply with the warmer days. This month typically sees minimal precipitation, averaging only 7 mm (0.3 in) over a mere single day, resulting in relatively dry conditions. Coupled with high humidity levels around 80%, December stands out as a unique time of year that provides a refreshing respite from the summer heat. For more detailed insights, visit Carlsbad Climate.