December Weather in Plymouth, United States

Last updated: February 24, 2025

Plymouth, United States, experiences a chilly December, with maximum temperatures reaching 16°C (62°F) and an average of 3°C (37°F). The month can bring frigid lows that dip to -15°C (6°F), making warm attire a necessity. Residents and visitors alike should prepare for 128 mm (5.0 in) of precipitation, spread over 11 days, leading to a relatively humid atmosphere at around 80%. This combination of cool temperatures and frequent rains creates a quintessential winter experience, perfect for cozy indoor gatherings and festive activities.

December Temperature in Plymouth

In December, Plymouth experiences a notable chill as winter settles in, with temperatures reflecting a significant drop compared to the milder months. The average temperature hovers around 3°C (37°F), while the minimum can plummet to -15°C (6°F), reminding residents of the season's frostiness. Despite the cold, daytime highs can reach up to 16°C (62°F), providing brief respites from the winter chill. As the year comes to a close, this month highlights a shift from the milder autumn warmth, setting the stage for the deep winter ahead. With evenings growing noticeably colder, Plymouth prepares for the cozy indoor gatherings and festive celebrations that make December a cherished time of year.

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

The chart illustrates December temperature patterns in Plymouth, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec333538475666727266574637
Data source: Temperature data for Plymouth 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 Plymouth

December in Plymouth ushers in a noteworthy precipitation average of 128 mm (or 5.0 inches), making it one of the wetter months of the year. Occurring over approximately 11 days, this consistent rainfall plays a vital role in transitioning the landscape from autumn hues to winter tones. Notably, precipitation tends to peak in October at 168 mm (6.6 in), followed closely by December, indicating a trend where late fall and early winter bring increased moisture to the area. This pattern reflects a shift from the drier summer months, such as August, which sees only 75 mm (3.0 in) of rain. As the year closes, Plymouth residents can expect the season's final splash before the quiet of winter sets in, highlighting the essential role December plays in the region's annual hydrological cycle.

December Precipitation Trends in Plymouth

The chart displays monthly precipitation patterns in Plymouth, 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.
JanFebMarAprMayJunJulAugSepOctNovDec891091141371059611075111168104128
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Plymouth

In Plymouth, United States, December brings a sense of consistency to the city's humidity levels, hovering at 80%. This slight increase from November's 80% indicates a trend of elevated humidity as the year draws to a close. Analyzing the yearly pattern, we see a gradual decline from 84% in January and February to a low of 75% during the warmer months of May through September. As the cooler temperatures of late fall and winter approach, humidity levels rebound slightly, maintaining a steady state. This cyclical fluctuation highlights Plymouth's damp climate, especially during the winter months, making December feel both crisp and refreshingly humid.

December Average Humidity in Plymouth

This chart illustrates the average monthly humidity levels in Plymouth, 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.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%82%79%75%78%76%76%76%75%80%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Plymouth

As December rolls into Plymouth, the UV Index drops to 2, indicating a low exposure category with a burn time of 45 minutes. This marks a shift from the peak summer months, where the index soared to 9, classifying the exposure as very high and drastically reducing the burn time to just 15 minutes. As the year progresses, Plymouth experiences increasing UV levels from the modest UV of 3 in January to the more intense readings in the warmer months. However, by December, residents can enjoy the outdoors with relatively less concern for UV exposure. For detailed information on the UV Index throughout the year, visit Plymouth UV Index.

Maximum UV Index Levels in Plymouth for December

The chart shows the monthly maximum UV Index (UVI) for Plymouth 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.
JanFebMarAprMayJunJulAugSepOctNovDec356899997642
Data source: Plymouth 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 Plymouth

In Plymouth, United States, December brings a cozy respite with about 173 hours of sunshine. While the days grow shorter as winter settles in, it still shines brighter than the early months of the year, particularly January, which only sees 148 hours of sunlight. This gradual increase from the winter solstice is a welcome shift after the darker fall months. As the seasons shift from autumn's 202 hours in November, the sun's presence in December signals a slow but steady approach toward the brighter months ahead, setting the stage for a hopeful transition into the new year. Although December doesn't compare to the sun-drenched glory of summer, it offers its own subtle charm, reminding residents of the brilliance that will return with the spring.

Monthly Sunshine Duration in Plymouth: December Highlighted

The December sunshine duration represents the total number of hours Plymouth 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.
JanFebMarAprMayJunJulAugSepOctNovDec148h188h253h241h289h324h337h323h276h224h202h173h
Data source: Plymouth December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Plymouth During December

In December, Plymouth experiences a 31% chance of sunny weather, continuing a trend of lower sunshine likelihood as the year draws to a close. Notably, this rate signifies a dip compared to the milder late autumn months, with November showing a more promising 54% chance for sunshine. As winter approaches, the likelihood of clear skies diminishes significantly after the relatively brighter months of March (60%) and September (45%). This December forecast suggests that residents might enjoy limited sunny days, making it a time for cozy indoor activities as winter's chill settles in.

Percentage of Sunny Days in December in Plymouth

The chart illustrates the percentage of sunny days in Plymouth 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 Plymouth experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec41%31%60%43%39%39%35%30%45%41%54%31%
Data source: Plymouth December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Plymouth in December

In Plymouth, the month of December brings a return to the shorter days of winter, with daylight lasting approximately 9 hours—the same as in November. As the year winds down, daylight hours dip significantly compared to the late spring and summer months when the sun graces the skies for up to 15 hours in June. The gradual transition from 10 hours in February to just 11 hours in March illustrates a steady increase in daylight as we move toward the spring equinox. December stands as a reminder of the seasonal ebb and flow of light, setting the stage for the gradual lengthening of days that will follow in the new year.

Average Daylight Hours in Plymouth for December

The chart illustrates the variation in daylight duration in Plymouth throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 29m10h 34m11h 58m13h 23m14h 35m15h 11m14h 51m13h 47m12h 25m11h9h 46m9h 8m
Data source: Plymouth daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Plymouth

As December sets in Plymouth, the winds continue a trend seen throughout the year, averaging 4.6 m/s (10 mph). This stability marks a slight decrease from the livelier start of the year, with January and February boasting a brisk 5.0 m/s (11 mph). The transition to winter brings a noticeable calm, as winds gradually taper off from the summer lows of 3.5 m/s (8 mph) in July and August. Despite this seasonal shift, December maintains a consistent breeze, mirroring November's conditions and ensuring that the charm of Plymouth's winter weather remains invigorating yet soothing. As the year closes, the winds remind us of nature's rhythmic cycle, balancing tranquil moments with invigorating gusts.

Average December Wind Speed in Plymouth

The chart displays monthly wind speed patterns in Plymouth, 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.
JanFebMarAprMayJunJulAugSepOctNovDec5.05.05.24.64.34.23.53.44.14.64.64.6 m/s
Data source: Plymouth December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Plymouth Compares to Other Months

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

In December, the weather experiences a wider temperature range with minimums dropping to -15°C (6°F) and maximums reaching 16°C (62°F), along with an average temperature of 3°C (37°F). It also sees substantial precipitation, totaling 128 mm (5.0 in) over approximately 11 days, combined with a relatively high humidity of 80%.

In contrast, January tends to be slightly colder overall, with minimum temperatures getting as low as -17°C (1°F) and an average of 1°C (34°F), while the maximum temperature increases slightly to 18°C (65°F). Precipitation decreases to 89 mm (3.5 in) over 9 days, and the humidity remains fairly high at 84%.

For a more detailed look at Plymouth's weather in January, visit Plymouth weather in January.

In comparing the weather between December and February, both months experience similar minimum temperatures, hovering around -15°C (5°F to 6°F). December boasts an average temperature of 3°C (37°F), slightly warmer than February's average of 2°C (35°F). Both months see maximum temperatures reaching 16 to 17°C (62°F), indicating a consistent mildness during the day. Precipitation is fairly comparable as well, with December receiving 128 mm (5.0 in) over 11 days, while February has slightly less at 109 mm (4.3 in) over 12 days. The humidity is also slightly higher in February at 84% compared to December's 80%. For a detailed look at weather patterns during February, you can check Plymouth weather in February.

In December, Plymouth experiences colder temperatures, with a minimum of -15°C (6°F) and an average of 3°C (37°F), while March offers slightly milder weather, featuring a minimum of -11°C (12°F) and similar average temperatures. Precipitation levels are somewhat comparable, with December receiving 128 mm (5.0 in) over 11 days, while March sees slightly less at 114 mm (4.5 in) over 10 days. Humidity is relatively high in both months, at 80% in December and 82% in March, making the air feel chilly during both periods. For more specific details about March weather, you can refer to this link: Plymouth weather in March.

December and April present quite contrasting weather experiences. In December, temperatures range from a chilly -15°C (6°F) to a comfortable 16°C (62°F), with an average temperature of 3°C (37°F). The month sees about 128 mm (5.0 in) of precipitation over 11 days, coupled with relatively high humidity at 80%. In contrast, April brings milder temperatures, ranging from -1°C (30°F) at night to a pleasant maximum of 24°C (75°F), with an average temperature of 8°C (47°F). While April has slightly more precipitation at 137 mm (5.4 in) over 13 days, the humidity remains similar at 79%. For a closer look at April's weather specifics, check out Plymouth weather in April.

December and May showcase stark contrasts in weather. In December, temperatures can dip as low as -15°C (6°F), with an average of 3°C (37°F) and a maximum reaching 16°C (62°F). This month brings about significant precipitation, averaging 128 mm (5.0 in) across 11 days, coupled with a high humidity level of 80%. In contrast, May enjoys milder conditions, with temperatures ranging from a minimum of 3°C (37°F) to a pleasant maximum of 28°C (82°F) and an average temperature of 13°C (56°F). Precipitation is slightly lower in May, totaling 105 mm (4.1 in) over 12 days, and the humidity is a bit more comfortable at 75%. For a detailed look at the weather in May, you can check Plymouth weather in May.

December and June present striking contrasts in weather. In December, temperatures range from a chilly minimum of -15°C (6°F) to a mild maximum of 16°C (62°F), with an average hovering around 3°C (37°F). This month also sees significant precipitation, totaling 128 mm (5.0 in) over 11 days, coupled with high humidity at 80%. In stark contrast, June boasts a more temperate climate, with temperatures ranging from a minimum of 9°C (49°F) to a peak of 31°C (87°F), averaging 19°C (66°F). The precipitation in June is lower, at 95 mm (3.8 in) over 10 days, and humidity is slightly less at 78%. For a detailed look at the June weather, visit Plymouth weather in June.

December and July exhibit dramatically different weather patterns. In December, temperatures can plunge as low as -15°C (6°F), with an average of 3°C (37°F) and a maximum of 16°C (62°F). The month also sees substantial precipitation of 128 mm (5.0 in) over approximately 11 days, accompanied by high humidity levels of 80%. In contrast, July tends to be significantly warmer, featuring minimum temperatures around 14°C (58°F) and an average of 22°C (72°F), peaking at a comfortable 34°C (93°F). Precipitation in July is slightly lower at 110 mm (4.3 in), spread over 10 days, with humidity at a more pleasant 76%. For more specifics on July weather, check Plymouth weather in July.

In December, the weather in Plymouth can be quite chilly, with temperatures ranging from a minimum of -15°C (6°F) to a maximum of 16°C (62°F), averaging around 3°C (37°F). This month also sees a significant amount of precipitation, totaling 128 mm (5.0 in) across approximately 11 days, accompanied by high humidity levels of 80%. In stark contrast, August brings much warmer temperatures, with a range of 12°C (54°F) to 32°C (90°F) and an average of 22°C (72°F). The summer month experiences less precipitation, around 75 mm (3.0 in) over about 10 days, and slightly lower humidity at 76%. For a more detailed look at Plymouth's climate during August, visit Plymouth weather in August.

December and September present quite contrasting weather conditions. In December, temperatures are significantly colder, with a minimum of -15°C (6°F) and an average of around 3°C (37°F), whereas September enjoys milder temperatures, ranging from a minimum of 10°C (50°F) to a comfortable average of 19°C (66°F), peaking at a warm 31°C (89°F). Precipitation levels are fairly similar, with December seeing 128 mm (5.0 in) over approximately 11 days, compared to September's 111 mm (4.4 in) over 9 days. Additionally, December's humidity is higher at 80%, while September maintains a lower humidity level of 75%. For a more detailed look at the weather in September, you can visit Plymouth weather in September.

In comparing the weather between December and October, there are notable differences in temperature and precipitation. December experiences much colder conditions, with minimum temperatures plummeting to -15°C (6°F) and an average of 3°C (37°F), while October enjoys milder weather with minimums around 1°C (34°F) and an average of 14°C (58°F). Additionally, October sees maximum temperatures reaching up to 25°C (78°F), in stark contrast to December’s peak of 16°C (62°F). Precipitation is slightly higher in October, totaling 168 mm (6.6 in) compared to December's 128 mm (5.0 in), although both months share a similar number of rainy days at 11. Humidity levels also differ, with December being slightly more humid at 80% compared to October's 75%. For more insights on October weather, you can check Plymouth weather in October.

December weather is generally colder than November, with average temperatures ranging from a minimum of -15°C (6°F) to a maximum of 16°C (62°F), compared to November's range of -8°C (17°F) to 21°C (70°F). Additionally, December experiences more precipitation, with 128 mm (5.0 in) over 11 days, slightly above November's 104 mm (4.1 in) across 10 days. Despite both months having similar humidity levels of 80%, the significant drop in temperatures and increased precipitation in December make it feel much chillier than November. For more details on November weather, visit Plymouth weather in November.

Compare Plymouth's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Plymouth

December in Plymouth brings a significant chill compared to the milder months of autumn, with the temperatures dipping notably. As the month unfolds, the landscape transforms under a blanket of humidity and precipitation, leading to a wintery atmosphere that starkly contrasts with the earlier seasons. The overall climate shifts to a wetter rhythm, with increased precipitation days that paves the way for a cozy, albeit brisk, holiday vibe. This transitional period not only refreshes the environment but also sets the stage for the colder months ahead. For more details about Plymouth's seasonal variations, check out Plymouth Climate.