Last updated: February 24, 2025
December in Mammoth Lakes, United States, offers a dazzling winter experience, with temperatures ranging from a maximum of 12°C (53°F) to a chilly average of -4°C (25°F), and dipping as low as -19°C (-2°F). Encountering approximately 81 mm (3.2 in) of precipitation over 7 days, this month is notable for its snowy landscapes and increased humidity levels at 79%, creating a crisp, invigorating atmosphere perfect for outdoor activities. Whether you're skiing down picturesque slopes or enjoying the serene winter scenery, December transforms Mammoth Lakes into a magical winter wonderland.
In Mammoth Lakes, December ushers in the heart of winter, with temperatures dipping to a minimum of -19°C (-2°F) and an average chill of -4°C (25°F). The peaks can reach a comfortable 12°C (53°F), providing a charming contrast against the frosty landscape. This month marks a notable drop from the more moderate temperatures of November, which had a slightly milder average of 2°C (35°F). As the year winds down, the region embraces its coldest period, with daily highs reflecting the season's embrace and inviting winter enthusiasts to enjoy snowy adventures against the backdrop of stunning alpine scenery.
In Mammoth Lakes, December typically marks a shift into the wetter winter months, with precipitation measuring 81 mm (3.2 in) across about 7 days. This is a noticeable increase compared to the drier summer months, where June, July, and August each recorded under 20 mm of rainfall. December's precipitation sets the stage for a snowy landscape, a pattern that paves the way for the heavier snowfall seen in January and February, where averages remain around 130 mm. The trend highlights a distinct seasonal transition for the region, with late fall and early winter bringing more moisture as temperatures drop, culminating in a rich tapestry of winter sports in the heart of the Sierra Nevada.
In Mammoth Lakes, December brings a humidity level of 79%, marking a slight decrease from the wetter months of January and February, yet still maintaining a relatively high moisture content in the air. As winter settles in, the humidity begins to drop from the summer lows of just 30% in August and reaches its peak with 85% in February. This trend illustrates how the region transitions from the dry, warm summer months to the cooler, more humid winter season. December's levels are similar to those in November, reflecting a consistent atmospheric moisture that complements the snowy landscapes typical of the area during this time. Overall, the gradual fluctuations in humidity highlight Mammoth Lakes' distinct seasonal rhythm, making December a cozy month for enjoying the crisp mountain air.
In Mammoth Lakes, December marks a noticeable dip in UV exposure, with an UV Index of 4 that falls into the moderate category. This reflects a decline from the soaring levels seen in the summer months, where indices peaked at 13, indicating extreme exposure and a burn time as brief as 10 minutes. As winter settles in, outdoor enthusiasts can enjoy more sun with less risk, allowing for 30 minutes of potential burn time without protective measures. This trend of decreasing UV levels continues from November’s UV Index of 6 and highlights the seasonal shifts in solar intensity. For detailed information on how to safeguard your skin in the sun, check out Mammoth Lakes UV Index.
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While December in Mammoth Lakes may not bask in the same sunshine as the peak summer months, it still offers a delightful 211 hours of sunlight, perfect for winter activities and cozy evenings. This is a slight decline from the vibrant weeks of November, reflecting the transition into the heart of winter. Interestingly, Mammoth Lakes experiences a gradual increase in daylight as the year progresses, with hours reaching a peak in June at 388 hours, followed by a gentle taper through the fall. December serves as a reminder of the seasonal ebb and flow, where the crisp, clear skies can beautifully contrast the snowy landscape, inviting both adventurers and relaxation seekers to embrace the unique charm of winter in the mountains.
In Mammoth Lakes, December typically presents a 43% chance of sunny weather, marking it as one of the cloudier months of the year. As we compare this with the preceding months, a clear trend emerges: sunny days are more frequent as we head into spring and summer, peaking in August with an impressive 91%. The transition from colder months shows a gradual increase in sunshine, notably April (72%) and May (79%), before reaching their summer highs. However, December struggles against this upward trend, ending the year on a less sunny note, reminiscent of the gloomier conditions seen in January (47%) and March (55%). As the year closes, nature reminds us to embrace the beauty of winter, even if it comes with a bit more cloud cover.
As the year winds down, Mammoth Lakes experiences a shift in daylight hours that reflects the changing seasons. In December, the daylight dips to 9 hours, marking the shortest days of the year. This trend of decreasing sunlight begins in November and continues through the winter months, creating a stark contrast to the vibrant 14 hours seen in June and July. As spring approaches, daylight gradually increases, reaching 11 hours in March and blossoming into 14 hours by May. This rhythmic ebb and flow of daylight not only shapes the natural landscape but also influences the activities and adventures that await in this beautiful mountain town.
In December, Mammoth Lakes experiences a noticeable uptick in wind activity, with average speeds reaching 2.4 m/s (5 mph), aligning with the higher velocities seen during the summer months. This slight increase from November's calm 1.8 m/s (4 mph) hints at a seasonal shift, breathing life into the winter landscape. While January through November typically hover between 1.8 and 2.3 m/s, the winter month of December marks a distinct transition, inviting adventurers and nature lovers alike to embrace the crisp, invigorating air. As the year winds down, it’s evident that Mammoth Lakes retains an enchanting allure, enhanced by the refreshing December breeze.
The weather in Mammoth Lakes 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 Mammoth Lakes and find detailed weather information for every month.
In comparing the weather of December and January, January tends to be colder, with minimum temperatures reaching -23°C (-9°F) compared to December's -19°C (-2°F). Both months experience similar average temperatures, but January's average is slightly lower at -5°C (24°F) versus December's -4°C (25°F). Precipitation increases significantly in January, with 130 mm (5.1 in) recorded, compared to December's 81 mm (3.2 in), while both months have precipitation occurring on seven days. Humidity remains relatively consistent across both months, with January at 82% and December at 79%. For a detailed look at the weather patterns during this chilly month, visit Mammoth Lakes weather in January.
December and February both showcase chilly temperatures, with average highs around -4°C (25°F). However, February tends to be slightly colder, with minimum temperatures reaching -21°C (-6°F) compared to December's -19°C (-2°F). Precipitation is also notably higher in February, totaling 129 mm (5.1 in) over 9 days, while December sees 81 mm (3.2 in) across 7 days. The humidity levels are a bit elevated in February at 85%, compared to December's 79%. For more detailed insights, check out Mammoth Lakes weather in February.
In comparing the weather of December and March, both months showcase cold temperatures, though March typically sees slightly milder conditions. December has a minimum temperature of -19°C (-2°F) and an average of -4°C (25°F), while March experiences a minimum of -20°C (-4°F) and an average of -2°C (28°F). Notably, the maximum temperature in March reaches 15°C (58°F), slightly higher than December's peak of 12°C (53°F). In terms of precipitation, March has a bit more rain, totaling 88 mm (3.5 in) over 10 days compared to December's 81 mm (3.2 in) over 7 days, with humidity levels remaining quite consistent at around 80% for March and 79% for December. For a detailed look at weather conditions specific to March, visit Mammoth Lakes weather in March.
In December, temperatures in Mammoth Lakes can dip as low as -19°C (-2°F), with an average temperature of -4°C (25°F) and highs reaching 12°C (53°F). The month sees significant precipitation, totaling 81 mm (3.2 in) over approximately 7 days, and the humidity levels are relatively high at 79%. In contrast, April experiences milder temperatures, with a minimum of -15°C (5°F), an average of 2°C (36°F), and a maximum of 18°C (65°F). Precipitation is less frequent in April, totaling 49 mm (1.9 in) over about 6 days, with slightly lower humidity at 72%. For more detailed weather information, you can check Mammoth Lakes weather in April.
December and May showcase stark differences in weather patterns. In December, temperatures plummet with a minimum of -19°C (-2°F) and an average of -4°C (25°F), while precipitation reaches 81 mm (3.2 inches) over 7 days, accompanied by a high humidity of 79%. In contrast, May offers a milder climate with minimum temperatures of -12°C (11°F) and an average of 6°C (43°F) peaking at 25°C (78°F). Precipitation in May is significantly lower at 40 mm (1.6 inches) over 9 days, accompanied by reduced humidity at 58%. For more details, you can explore Mammoth Lakes weather in May.
December and June present stark contrasts in weather. In December, temperatures plunge with a minimum of -19°C (-2°F) and an average of -4°C (25°F), while the maximum reaches only 12°C (53°F). The month is characterized by significant precipitation, totaling 81 mm (3.2 in) over approximately 7 days, accompanied by high humidity levels of 79%. In contrast, June brings a much milder climate, with minimum temperatures of -4°C (25°F) and an average of 14°C (57°F), peaking at a warm 29°C (84°F). Precipitation dramatically decreases to just 11 mm (0.4 in) across 3 days, and humidity drops to 49%. For a closer look at the pleasant weather conditions of June, check out Mammoth Lakes weather in June.
The weather in December contrasts sharply with that of July, showcasing the stark seasonal differences. In December, temperatures can plunge to a chilling minimum of -19°C (-2°F) with an average of -4°C (25°F), and highs reaching only 12°C (53°F). This month also sees considerable precipitation, measuring 81 mm (3.2 in) over approximately seven days, alongside a high humidity level of 79%. In contrast, July brings much milder and more pleasant conditions, with temperatures ranging from a minimum of 4°C (39°F) to a warm average of 18°C (64°F) and highs peaking at 31°C (87°F). Precipitation is minimal in July, totaling only 17 mm (0.7 in) over four days and accompanied by a much lower humidity of 36%. For a detailed look at the warm climate, you can check out Mammoth Lakes weather in July.
December and August present strikingly contrasting weather conditions. In December, temperatures can plunge to a minimum of -19°C (-2°F) and typically hover around an average of -4°C (25°F), reaching a maximum of 12°C (53°F). This month also sees considerable precipitation of 81 mm (3.2 in) over 7 days, coupled with high humidity at 79%. In stark contrast, August enjoys much milder temperatures, with a minimum of 3°C (38°F) and an average of 17°C (63°F), peaking at a maximum of 30°C (86°F). Precipitation is minimal in August, totaling only 11 mm (0.4 in) across 3 days and accompanied by much lower humidity at 30%. For a more detailed look at the weather during this month, check out Mammoth Lakes weather in August.
In comparing the weather between December and September, a stark contrast emerges. December often experiences much colder temperatures, with a minimum of -19°C (-2°F) and an average of -4°C (25°F), while September boasts milder conditions, marking a minimum of -6°C (22°F) and an average of 13°C (56°F). Additionally, September showcases maximum temperatures reaching 30°C (86°F), significantly warmer than December's max of 12°C (53°F). Precipitation is also notably different, as December sees about 81 mm (3.2 in) of rainfall over seven days, while September is much drier, recording only 9 mm (0.4 in) over just two days. The humidity levels reflect these seasonal changes as well, with December at 79% compared to September's much lower 42%. For a more detailed look at the weather during September, check out Mammoth Lakes weather in September.
December and October showcase stark contrasts in weather conditions. In December, temperatures can plunge as low as -19°C (-2°F), with an average of -4°C (25°F), while the maximum rarely exceeds 12°C (53°F). This month also sees significantly higher precipitation, totaling 81 mm (3.2 in) over approximately 7 days, accompanied by a humidity level of 79%. In contrast, October enjoys milder temperatures, with a minimum of -10°C (14°F), an average of 7°C (44°F), and highs reaching up to 24°C (75°F). Precipitation in October is notably lighter, at only 23 mm (0.9 in) over just 1 day, and the humidity is lower at 59%. For those interested in exploring more about October's weather, here's a link to Mammoth Lakes weather in October.
In comparing the weather between November and December, December exhibits colder temperatures overall, with an average of -4°C (25°F) compared to November's milder average of 2°C (35°F). The minimum temperatures in both months are quite low, with December reaching a chilling -19°C (-2°F) and November slightly milder at -17°C (2°F). Additionally, December experiences increased precipitation, accumulating 81 mm (3.2 in) over 7 days, in contrast to November's 48 mm (1.9 in) over just 4 days. Humidity levels are relatively similar, with December at 79% and November at 78%. For more detailed insights, you can check Mammoth Lakes weather in November.
In December, Mammoth Lakes transforms into a winter wonderland, showcasing a significant shift in weather compared to other months. With temperatures dipping to their coldest lows—often averaging around -4°C (25°F)—the chill in the air heralds the arrival of snow, complemented by a notable humidity level of 79%. This increase in moisture results in an average of 81 mm (3.2 in) of precipitation over just seven days, making December one of the wetter months. As visitors revel in the snow-packed landscapes, the contrast with the milder temperatures of autumn becomes stark. For those keen to explore more about the region's climate, visit Mammoth Lakes Climate.