January Weather in Plymouth, United States

Last updated: February 24, 2025

In January, Plymouth, United States experiences a diverse range of weather conditions, with temperatures fluctuating between a maximum of 18°C (65°F) and a minimum of -17°C (1°F). The average temperature hovers around 1°C (34°F), creating a cold yet sometimes mild environment. Despite the chill, January brings 89 mm (3.5 in) of precipitation over approximately 9 days, contributing to an overall humidity level of 84%. This combination of temperature and moisture creates a unique winter experience, making Plymouth an intriguing destination during this season.

January Temperature in Plymouth

January in Plymouth, United States, is characterized by its chilly temperatures, with a remarkable range between -17°C (1°F) for the minimum and a high of 18°C (65°F). The average temperature hovers around 1°C (34°F), signaling the heart of winter. As the month progresses, a subtle but steady warming trend becomes apparent, setting the stage for the slightly milder February. This transition indicates that while January is cold, it's a prelude to the gradual thawing that starts as winter gives way to early spring. While the bite of winter continues to linger, the variations from frigid lows to relatively warm highs remind us of the dynamic climate Plymouth experiences during this time of year.

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

The chart illustrates January 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.

January Precipitation in Plymouth

In Plymouth, January typically ushers in a modest precipitation total of 89 mm (3.5 in), marking a quieter start to the year compared to the rainier months that follow. With precipitation occurring over nine days, residents can expect a mix of light showers rather than heavy downpours. This trend of gradually increasing rainfall becomes evident in February, where the total rises to 109 mm as the winter season begins to thaw. The early months set the stage for a steady increase in both precipitation amount and days throughout the spring, culminating in April's peak of 137 mm. By the end of spring, the region experiences ample rainfall, but January remains a relatively dry month in the annual cycle, paving the way for more vibrant precipitation patterns as the year progresses.

January Precipitation Trends in Plymouth

The chart displays monthly precipitation patterns in Plymouth, with values for each month alongside January's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec891091141371059611075111168104128
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Plymouth

In Plymouth, United States, January sets the tone for the year with a noteworthy humidity level of 84%, which remains consistent through February. As winter gives way to spring, a gradual decline appears, tapering to 82% in March and further down to 79% by April. This trend continues into the warmer months, reaching its lowest point at 75% from May to October. Interestingly, humidity begins to rise again as the year winds down, with November and December both showing elevated levels of 80%. Overall, Plymouth experiences a cyclical pattern, where the peak humidity is encountered in the early months, transitioning into drier conditions, before making a slight comeback as winter approaches once more.

January Average Humidity in Plymouth

This chart illustrates the average monthly humidity levels in Plymouth, with January's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how January's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%82%79%75%78%76%76%76%75%80%80%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Plymouth

In January, Plymouth experiences a UV Index of 3, placing it in the moderate exposure category with a burn time of 30 minutes. As winter progresses into February, the UV Index rises to 5, maintaining the moderate category but hinting at increased sunlight intensity. This trend continues into March, where the UV Index reaches 6, transitioning into the high exposure range and shortening the burn time to 25 minutes. The spring months see a significant spike, especially in April and May, where the UV Index climbs to 8 and 9, respectively, indicating a shift to very high exposure and reducing burn times to just 15 minutes. This pattern of high UV levels persists through the summer, peaking in July and August. A gradual decrease follows in September and October, as the UV Index drops to 7 and 6, yet still classified as high. By late fall and winter, the UV Index decreases again, with November at 4 (moderate) and December falling to 2 (low), allowing for a more extended burn time of 45 minutes. These trends highlight the importance of sun protection as Plymouth transitions from winter to summer, so it's essential to stay informed about the UV Index daily. For more insights, visit Plymouth UV Index.

Maximum UV Index Levels in Plymouth for January

The chart shows the monthly maximum UV Index (UVI) for Plymouth in January, 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 January 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.

January Sunshine in Plymouth

In Plymouth, January greets residents with 148 hours of sunshine, a modest start to the year. However, as the months progress, the days stretch longer, peaking in summer with 337 hours of radiant sunshine in July. February sees a slight increase to 188 hours, setting the stage for a steady climb through the spring. By March and April, sunlight embraces the city with 253 and 241 hours, respectively, hinting at the vibrant days to come. The transition into summer highlights an impressive 289 hours in May, with June maintaining the momentum at 324 hours. As summer bids farewell, sunshine gently wanes, with 276 hours in September. The year concludes with cooler days, signaling a gradual retreat to 202 hours in November and 173 hours in December, leaving residents eager for the return of longer days and brighter skies.

Monthly Sunshine Duration in Plymouth: January Highlighted

The January sunshine duration represents the total number of hours Plymouth experiences direct sunlight during the month of January, excluding cloudy or obstructed periods. This chart compares the sunshine duration of January with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec148h188h253h241h289h324h337h323h276h224h202h173h
Data source: Plymouth January Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Plymouth During January

In Plymouth, the chance of sunny weather in January stands at 41%, making it a relatively promising start to the year compared to the dreary clouds often associated with winter months. While this figure is higher than the subsequent cold months like February (31%) and the summer slowdown from July to August (35% and 30% respectively), it still falls short of the sunnier days that grace the spring months, particularly March (60%). As winter yields to spring, the likelihood of sunshine increases, suggesting that January serves as a transitional month where the prospect of clear skies begins to improve, hinting at brighter days ahead.

Percentage of Sunny Days in January in Plymouth

The chart illustrates the percentage of sunny days in Plymouth throughout the year, with January 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 January chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Plymouth in January

In January, Plymouth experiences about 9 hours of daylight, a stark reminder of winter's grip. As the month progresses into February and then March, daylight steadily increases, reaching 11 hours by March, signaling the gradual approach of spring. This upward trend continues into April and May, where daylight peaks at a vibrant 14 hours in May, inviting outdoor activities and longer evenings. The long summer days peak in June, offering an impressive 15 hours of sunlight. As the year shifts into summer’s twilight, July and August witness a gentle decline, with daylight receding to 14 and 13 hours, respectively. The rhythm of the seasons reestablishes itself in September, where daylight begins its descent, tapering off to 12 hours before significantly dwindling back to 9 hours by November and December. This cyclical pattern vividly illustrates Plymouth's transition from the deep, dark days of winter to the lively brightness of summer, encapsulating the essence of seasonal change.

Average Daylight Hours in Plymouth for January

The chart illustrates the variation in daylight duration in Plymouth throughout the year, with January 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.

January Winds in Plymouth

In January, Plymouth experiences a refreshing average wind speed of 5.0 m/s (11 mph), setting a tone that persists into February. However, as spring approaches, a subtle rise to 5.2 m/s (12 mph) in March hints at the invigorating breezes that often accompany the season's awakening. Post-March, the winds begin a gradual decline, dipping to 4.6 m/s (10 mph) in April before reaching their annual low of 3.4 m/s (8 mph) in August, reflecting the calming influence of summer. This trend stabilizes slightly as autumn arrives, with wind speeds creeping back up to around 4.6 m/s (10 mph) from October through December, resulting in a gentle ebb and flow throughout the year. The data draws a clear picture of Plymouth's winds, showcasing a vibrant, seasonal rhythm that adds charm to the coastal landscape.

Average January Wind Speed in Plymouth

The chart displays monthly wind speed patterns in Plymouth, with values for each month shown alongside January's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how January's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec5.0 m/s5.05.24.64.34.23.53.44.14.64.64.6
Data source: Plymouth January wind data, generated using information from the Copernicus Climate Change Service.

How January 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 January'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 comparing the weather between January and February, both months exhibit similar humidity levels at 84%, but February generally experiences slightly milder temperatures. January features average temperatures around 1°C (34°F), with a maximum of 18°C (65°F) and a minimum dipping to -17°C (1°F). In contrast, February's average rises to 2°C (35°F), with temperatures ranging from a minimum of -15°C (5°F) to a maximum of 17°C (62°F). Additionally, February sees increased precipitation, totaling 109 mm (4.3 in) over 12 days, compared to January's 89 mm (3.5 in) over 9 days. For more details on February weather, you can check Plymouth weather in February.

In comparison to January, March shows a slight increase in average temperatures, rising from 1°C (34°F) to 3°C (39°F). While January experiences a broader temperature range with a maximum of 18°C (65°F), March's highs are slightly lower at 17°C (63°F). Precipitation also sees an uptick in March, with 114 mm (4.5 in) over 10 days, compared to January's 89 mm (3.5 in) across 9 days. However, humidity levels remain relatively similar, decreasing slightly from 84% in January to 82% in March. For more details about the weather during this time, check out Plymouth weather in March.

In comparing the weather of January and April, significant differences emerge in temperature and precipitation patterns. January features colder temperatures, with a minimum reaching -17°C (1°F) and an average of just 1°C (34°F), while April sees a noticeable warming trend, with temperatures ranging from a minimum of -1°C (30°F) to a maximum of 24°C (75°F) and an average of 8°C (47°F). While January experiences 89 mm (3.5 in) of precipitation over 9 days, April records even higher precipitation at 137 mm (5.4 in) over 13 days, indicating a shift towards wetter conditions as spring progresses. Additionally, humidity levels are relatively high in both months, with January at 84% and April slightly lower at 79%. For more detailed insights about April weather, you can refer to Plymouth weather in April.

January weather in Plymouth contrasts sharply with that of May. In January, temperatures can plummet as low as -17°C (1°F), with an average of 1°C (34°F) and maximums reaching 18°C (65°F). The month sees 89 mm (3.5 inches) of precipitation over about 9 days, accompanied by high humidity at 84%. In comparison, May brings milder conditions, with minimum temperatures of 3°C (37°F), an average of 13°C (56°F), and highs of 28°C (82°F). Precipitation increases slightly to 105 mm (4.1 inches) across 12 days, but humidity drops to a more comfortable 75%. For more detailed information, check out Plymouth weather in May.

January and June present striking contrasts in weather. In January, temperatures can plunge as low as -17°C (1°F), with an average of just 1°C (34°F) and occasional highs reaching 18°C (65°F). The month is characterized by higher humidity at 84% and a total precipitation of 89 mm (3.5 inches) over about 9 days. In contrast, June brings milder and more pleasant weather, with minimum temperatures of 9°C (49°F), an average of 19°C (66°F), and maximums soaring to 31°C (87°F). Despite a slightly higher total precipitation of 95 mm (3.8 inches) over 10 days, humidity drops to a more comfortable 78%. For a closer look at the conditions during June, you can visit Plymouth weather in June.

In comparing the weather between January and July, it is evident there is a stark contrast in temperatures. January experiences frigid conditions with a minimum temperature plunging to -17°C (1°F) and an average of just 1°C (34°F), while July boasts much warmer weather, featuring a minimum of 14°C (58°F) and an average of 22°C (72°F). Additionally, July can see maximum temperatures soaring to 34°C (93°F), compared to January's highest of 18°C (65°F). Precipitation is somewhat similar, with January receiving 89 mm (3.5 in) over 9 days and July slightly higher at 110 mm (4.3 in) across 10 days. Notably, January's humidity is higher at 84%, compared to July's 76%. For more details on July weather, check out Plymouth weather in July.

January and August showcase striking contrasts in weather. In January, temperatures can plummet to a minimum of -17°C (1°F), with an average of just 1°C (34°F) and a maximum reaching 18°C (65°F). This cold month also sees significant humidity at 84% and 89 mm (3.5 in) of precipitation over approximately nine days. In contrast, August offers much warmer temperatures, with a minimum of 12°C (54°F) and an average of 22°C (72°F), peaking at a comfortable 32°C (90°F). The humidity level is lower at 76%, and while it sees about 75 mm (3.0 in) of precipitation, it spreads across ten days. For more details on August weather, check out Plymouth weather in August.

In January, temperatures can plummet as low as -17°C (1°F), with an average of around 1°C (34°F) and occasional highs reaching 18°C (65°F). The month is characterized by high humidity at 84% and about 89 mm (3.5 inches) of precipitation over nine days. In stark contrast, September boasts milder temperatures, with minimums around 10°C (50°F) and averages climbing to 19°C (66°F), while peaks can soar up to 31°C (89°F). Although September has slightly more precipitation at 111 mm (4.4 inches) across the same number of rainy days, the humidity is lower at 75%, contributing to a more comfortable atmosphere. For more detailed insights, check out this resource: Plymouth weather in September.

In January, temperatures can plummet as low as -17°C (1°F), with an average around 1°C (34°F), offering chilly winter conditions. In contrast, October features milder temperatures, ranging from a minimum of 1°C (34°F) to a comfortable maximum of 25°C (78°F), creating an inviting autumn atmosphere. While January experiences about 89 mm (3.5 in) of precipitation over nine days, October sees increased rainfall, totaling 168 mm (6.6 in) across eleven days. Additionally, humidity levels tend to be higher in January at 84%, compared to a more moderate 75% in October. For more specific insights about October in Plymouth, you can check out Plymouth weather in October.

When comparing the weather in January and November, notable differences emerge in temperature and precipitation patterns. January is characterized by a colder climate, with temperatures ranging from a chilling minimum of -17°C (1°F) to a more moderate maximum of 18°C (65°F), averaging around 1°C (34°F). In contrast, November boasts a milder temperature range, with a minimum of -8°C (17°F) and a maximum of 21°C (70°F), averaging 8°C (46°F). Precipitation levels are fairly comparable, with January receiving 89 mm (3.5 in) over 9 days, while November experiences slightly higher precipitation at 104 mm (4.1 in) across 10 days. Humidity also plays a role, being slightly higher in January at 84% compared to November's 80%. For more specific insights into November weather, you can check out Plymouth weather in November.

January typically experiences slightly colder average temperatures compared to December, with January's minimum reaching -17°C (1°F) and an average of 1°C (34°F), while December has a minimum of -15°C (6°F) and an average of 3°C (37°F). Both months see a notable amount of precipitation, but December tends to be wetter with 128 mm (5.0 in) over 11 days, compared to January's 89 mm (3.5 in) over 9 days. Humidity levels are relatively high in both months, with January averaging 84% and December at 80%. For more detailed weather information, you can visit Plymouth weather in December.

Compare Plymouth's Climate with Cities Worldwide

Conclusion: What to Expect From January Weather in Plymouth

January in Plymouth offers a striking contrast to the milder months, with cold temperatures that can plunge below freezing and a significant rarity of warmer days. While the average chill settles around 1°C, the occasional peak at 18°C feels like a fleeting escape from the winter grasp. Precipitation is frequent, cycling through rain and snow over nine days, contributing to the high humidity levels that linger in the air. The blend of cold and wet makes January distinctively brisk, shaping a landscape that differs greatly from the rest of the year. To learn more about Plymouth's unique weather patterns, visit Plymouth Climate.