December Weather in Princeton, United States

Last updated: February 24, 2025

In December, Princeton, United States experiences a significant chill, with average temperatures hovering around 4°C (39°F) and dipping to as low as -12°C (11°F) at night. The daytime warmth peaks at a moderate 19°C (67°F), creating a sharp contrast with the frigid nights. Precipitation is a notable feature this month, totaling 104 mm (4.1 in) over approximately 10 wet days, contributing to the city’s 80% humidity levels. As the year draws to a close, residents can expect a blend of crisp winter air and occasional rain, setting a picturesque scene of seasonal transition.

December Temperature in Princeton

In December, Princeton, United States, ushers in a winter chill that marks a shift from the milder fall months. With temperatures ranging from a brisk -12°C (11°F) as the minimum to a pleasant 19°C (67°F) at the peak, December presents a cool yet bearable climate. The average temperature hovers around 4°C (39°F), indicating a significant drop compared to the warmer months preceding it. As the year winds down, the residents experience a consistent pattern of cooler days, setting the stage for the heart of winter. While frost fills the air, the fluctuating highs suggest that a cozy warmth is still within reach, inviting both chilly adventures and snug evenings indoors.

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

The chart illustrates December temperature patterns in Princeton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec353843546372787670614639
Data source: Temperature data for Princeton 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 Princeton

December in Princeton sees a noteworthy precipitation level, with an average of 104 mm (4.1 in) falling over approximately 10 days. This places December towards the higher end of the monthly rainfall spectrum, closely trailing the wetter months of May and July. The year concludes with December's rainfall reflecting a slight dip from the more substantial totals observed in the spring and summer months, yet it maintains a consistent presence reminiscent of the preceding autumn. As winter approaches, precipitation patterns shift, offering a balance of rain and the occasional onset of snow, fostering a transition that complements the festive spirit of the season. Overall, December's wet days and moderate rainfall aptly highlight the changing climate as Princeton prepares to embrace the colder months ahead.

December Precipitation Trends in Princeton

The chart displays monthly precipitation patterns in Princeton, 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.
JanFebMarAprMayJunJulAugSepOctNovDec641091091061311001391358712183104
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Princeton

As December wraps up the year in Princeton, the humidity levels typically hover around 80%, reflecting a subtle drop from the chilly, damp November at 82%. This month marks a transition as winter approaches, with a noticeable decline compared to the summer months, where humidity levels were in the 60s. Interestingly, December's humidity is slightly higher than the 74% observed in October, indicating the lingering influence of the fall season before the crisp, dry air of winter fully takes hold. Overall, the trend showcases a gradual reduction in humidity from the summer peak, emphasizing the shift toward the colder, drier months of the year.

December Average Humidity in Princeton

This chart illustrates the average monthly humidity levels in Princeton, 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%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Princeton

In December, Princeton experiences a notable decline in UV exposure, with the UV Index dropping to 2, categorizing it as low. This relatively safe level allows for longer sun exposure without risk of burning, with an average burn time of 45 minutes. As the year progresses from the intense summer months, where the UV Index peaked at a high of 10, December signals a much gentler influence of the sun. Interestingly, this trend of decreasing UV levels begins in the fall, leading to a consistent pattern of lower exposure in the winter months. For those planning outdoor activities, it's a perfect opportunity to enjoy the fresh winter air while keeping sun safety in mind. For more detailed information, check out Princeton UV Index.

Maximum UV Index Levels in Princeton for December

The chart shows the monthly maximum UV Index (UVI) for Princeton 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.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Princeton 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 Princeton

In Princeton, United States, December boasts 180 hours of sunshine, marking a gentle dip compared to the sun-drenched peak of July with its impressive 349 hours. As the year winds down, daylight gradually diminishes, most notably from the radiant summer months that blanket the region in light. However, December still shines bright, significantly outpacing the winter months of January, which starts the year with just 147 hours. With February following closely at 178 hours, there is a notable recovery as the days grow longer, hinting at the promise of spring ahead. This pattern reflects a consistent increase in sunshine hours as we leap from the stark cold of winter, through a gradual transition, and finally into the welcoming embrace of summer.

Monthly Sunshine Duration in Princeton: December Highlighted

The December sunshine duration represents the total number of hours Princeton 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.
JanFebMarAprMayJunJulAugSepOctNovDec147h178h249h248h278h315h349h312h272h226h218h180h
Data source: Princeton December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Princeton During December

December in Princeton brings a notable drop in the chances of sunny weather, with only a 31% chance of sun. This decline follows a trend seen throughout the winter months, particularly when compared to November's healthier 55%, marking a seasonal shift toward cloudier conditions. As the year winds down, Princeton experiences a slump in sunshine, with the probability of clear skies noticeably lower than the spring peak of 56% in March. Overall, while hints of sunshine can still peek through the winter clouds, December typically favors more overcast days, indicating that residents and visitors may need to embrace the season's gloom.

Percentage of Sunny Days in December in Princeton

The chart illustrates the percentage of sunny days in Princeton 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 Princeton experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec45%29%56%44%41%37%45%30%49%37%55%32%
Data source: Princeton December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Princeton in December

As the year draws to a close, December in Princeton, United States, marks a return to shorter days, with daylight lasting around 9 hours. This brevity follows a gradual increase in sunlight through the months, peaking in the vibrant days of May and June when the sun graces the sky for 14 hours. The transition from the darker days of winter to the bright blooms of spring unveils a clear pattern: daylight begins at a mere 9 hours in January, steadily advancing to 14 hours in mid-summer before tapering off again as autumn sets in. By December, as winter tightens its grip, daylight retreats, echoing the cycle of nature’s rhythms, inviting a time of rest and reflection before the sun's return.

Average Daylight Hours in Princeton for December

The chart illustrates the variation in daylight duration in Princeton throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 40m10h 41m11h 58m13h 17m14h 24m14h 58m14h 39m13h 40m12h 24m11h 5m9h 56m9h 21m
Data source: Princeton daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Princeton

As December settles in Princeton, the average wind speed dips to 2.9 m/s (6 mph), reflecting a gradual trend towards calmer conditions compared to the brisker months that preceded it. This decrease continues a pattern seen throughout the year, with the highest wind speeds recorded in the early spring months of March at 3.6 m/s (8 mph), while the summer months brought even lighter breezes, particularly in July and August, each averaging just 2.3 m/s (5 mph). Overall, December's winds contribute to the tranquil atmosphere of winter, providing a peaceful backdrop as the year draws to a close, highlighting the seasonal shift from lively gusts to a more hushed and serene environment.

Average December Wind Speed in Princeton

The chart displays monthly wind speed patterns in Princeton, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.33.43.63.33.02.62.32.32.93.03.12.9 m/s
Data source: Princeton December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Princeton Compares to Other Months

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

December and January feature similar temperature patterns, but January is typically colder. In December, temperatures range from a minimum of -12°C (11°F) to a maximum of 19°C (67°F) with an average of 4°C (39°F), while January sees temperatures dipping even lower with a minimum of -17°C (2°F) and an average of 2°C (35°F). Additionally, December experiences more precipitation, totaling 104 mm (4.1 in) over about 10 days, compared to January's 64 mm (2.5 in) spread over 8 days. Humidity is slightly higher in January, at 84%, compared to December's 80%. For more detailed weather conditions in January, visit Princeton weather in January.

December and February exhibit distinct yet somewhat comparable weather patterns. In December, the temperatures range from a minimum of -12°C (11°F) to a maximum of 19°C (67°F), with an average temperature of 4°C (39°F) and about 104 mm of precipitation over approximately 10 days with a humidity level of 80%. In contrast, February experiences slightly colder minimum temperatures at -16°C (4°F) but can reach a warmer maximum of 26°C (79°F), with an average temperature closely mirroring December at 3°C (38°F). February also sees a slight increase in precipitation to 109 mm over 11 days and a marginally higher humidity level of 82%. For a closer look at February weather specifics, refer to Princeton weather in February.

In December, temperatures typically range from a chilly -12°C (11°F) at night to a mild 19°C (67°F) during the day, with an average of 4°C (39°F). The month experiences a fair amount of precipitation, with about 104 mm (4.1 in) falling over 10 days and humidity hovering around 80%. In contrast, March sees a slight increase in average temperature, rising to 6°C (43°F) with daytime highs reaching as much as 28°C (83°F). Though precipitation is similar at 109 mm (4.3 in) over the same number of days, the humidity remains comparable at 81%. For a detailed look at what to expect, check out Princeton weather in March.

When comparing December and April weather, there is a striking contrast in temperature and conditions. December experiences colder temperatures, with a minimum of -12°C (11°F) and an average of 4°C (39°F), while April sees a significant warming trend, where temperatures range from a minimum of -2°C (29°F) to an average of 12°C (54°F) and can peak as high as 31°C (88°F). In terms of precipitation, both months are relatively similar, with December receiving 104 mm (4.1 in) over 10 days, compared to April's 106 mm (4.2 in) over 12 days. Humidity remains mildly high in both months, at around 80% for December and 78% for April. To delve deeper into what to expect in April, check out Princeton weather in April.

December and May present strikingly different weather profiles. In December, temperatures range from a chilly minimum of -12°C (11°F) to a mild maximum of 19°C (67°F), with an average temperature of about 4°C (39°F). The month sees approximately 104 mm (4.1 in) of precipitation over 10 days, accompanied by high humidity levels of 80%. In contrast, May boasts significantly warmer temperatures, with a minimum of 1°C (35°F) and a maximum soaring up to 35°C (94°F), resulting in an average of 17°C (63°F). The precipitation in May increases slightly to 131 mm (5.1 in) across 13 days, but the humidity drops to a more comfortable 69%. For more insights into May's weather conditions, check out Princeton weather in May.

December and June present strikingly different weather conditions. In December, temperatures can drop as low as -12°C (11°F), with an average of 4°C (39°F) and a maximum of 19°C (67°F). This month is characterized by high humidity levels at 80% and significant precipitation, averaging 104 mm (4.1 in) over about 10 days. In contrast, June brings a warmer climate with minimum temperatures of 9°C (48°F), averages around 22°C (73°F), and a high of 36°C (97°F). Although June has slightly less precipitation at 100 mm (3.9 in) over 12 days, it boasts a lower humidity of 69%. These contrasts highlight the seasonal shift from the cold, wet conditions of December to the warm, more humid environment of June. For more detailed insights, you can check out Princeton weather in June.

In December, temperatures can drop as low as -12°C (11°F), with an average of 4°C (39°F) and occasional highs reaching 19°C (67°F). The month experiences substantial precipitation at 104 mm (4.1 in) over about 10 days, coupled with high humidity at 80%. In stark contrast, July boasts milder minimum temperatures of 13°C (56°F) and an average of 26°C (78°F), peaking at a sweltering 37°C (98°F). July is wetter, with 139 mm (5.5 in) of precipitation occurring over 14 days, but the humidity is noticeably lower at 62%. For more details on the warm July climate, you can explore Princeton weather in July.

In December, the weather is markedly colder with temperatures ranging from a brisk -12°C (11°F) to a more comfortable 19°C (67°F), averaging around 4°C (39°F). This month experiences substantial precipitation, totaling 104 mm (4.1 in) over about 10 days, coupled with high humidity levels at 80%. In contrast, August brings warmth and vibrant temperatures, with a minimum of 14°C (57°F) and a maximum soaring to 35°C (96°F), averaging 24°C (76°F). The summer month sees slightly higher precipitation at 135 mm (5.3 in) across 14 days, but with lower humidity at 65%. For a detailed look at August weather, you can visit Princeton weather in August.

When comparing the weather in December and September, it’s clear that these months exhibit stark differences. December’s temperatures range from a chilly minimum of -12°C (11°F) to an average of 4°C (39°F), with a maximum reaching 19°C (67°F). In stark contrast, September boasts a much warmer climate, with temperatures varying from a minimum of 6°C (43°F) to a balmy average of 21°C (70°F) and highs soaring to 35°C (95°F). While December sees higher precipitation at 104 mm (4.1 in) with about 10 rainy days, September has slightly less rainfall at 87 mm (3.4 in) over the same number of days. Additionally, humidity levels in December are elevated at 80%, compared to September’s 68%. For more detailed information about Princeton's September weather, you can check this link: Princeton weather in September.

In December, temperatures drop significantly compared to October, with minimums reaching -12°C (11°F) and average highs around 4°C (39°F). In contrast, October boasts much milder conditions, featuring a minimum temperature of 1°C (34°F) and an average maximum of 16°C (61°F). Additionally, while both months experience about 10 days of precipitation, December sees slightly less rainfall at 104 mm (4.1 in), compared to October's 121 mm (4.8 in). The humidity is also higher in December at 80%, compared to 74% in October, contributing to a colder and more frigid atmosphere during the holiday season. For more detailed information on the weather in October, you can visit Princeton weather in October.

In comparing the weather between November and December, December experiences colder temperatures, with minimums dropping to -12°C (11°F) compared to November's minimum of -9°C (15°F). The average temperature also declines, from November's 8°C (46°F) to 4°C (39°F) in December. Notably, December sees a wider temperature range, reaching a maximum of 19°C (67°F), while November can peak at 25°C (77°F). Precipitation increases slightly in December, totaling 104 mm (4.1 in) over 10 days, in contrast to November's 83 mm (3.3 in) over 9 days. Humidity levels remain relatively stable, hovering around 80% in December and 82% in November. For more detailed insights into November's weather, you can visit Princeton weather in November.

Compare Princeton's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Princeton

As December sets in, Princeton experiences a significant shift in weather compared to the milder months earlier in the year. The bite of winter becomes evident as temperatures drop, with chilly averages and occasional frosty nights, inviting residents to bundle up in cozy attire. Precipitation increases, with more rainy days, contributing to a higher humidity level that hangs in the air. This combination of cool breezes and damp conditions gives December a distinct character, contrasting sharply with the warmth of autumn. For a deeper look at how these variations shape the overall climate, visit Princeton Climate.