December Weather in Chatham, United States

Last updated: February 24, 2025

In Chatham, United States, December brings a mix of chilly temperatures and significant precipitation. Expect a maximum of 15°C (60°F) and an average of 5°C (41°F), with lows dipping to a brisk -10°C (14°F). Throughout the month, residents can anticipate approximately 138 mm (5.4 in) of rainfall spread over 12 rainy days, leading to a humid atmosphere with an average humidity of 80%. This weather combination sets the stage for a classic winter ambiance, making December in Chatham both invigorating and moody.

December Temperature in Chatham

As December descends upon Chatham, the temperatures begin to shift toward winter's chill. With minimums dipping to -10°C (14°F), the cold is palpable, yet the average temperature hovers around a moderate 5°C (41°F), providing a slight reprieve from the harsher depths of winter. The brightest days of the month may even see maximums reaching 15°C (60°F), offering a cozy backdrop for holiday festivities. This month's temperatures reveal a gradual cooling trend from the previous months, notably from November's milder warmth, positioning December as a pivotal transition into the depths of winter. Overall, residents can expect a mix of chilly mornings and relatively pleasant afternoons, perfect for enjoying the holiday spirit while bundled up against the winter air.

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

The chart illustrates December temperature patterns in Chatham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec363638455261697066594840
Data source: Temperature data for Chatham generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Chatham

In December, Chatham experiences a notable uptick in precipitation, receiving 138 mm (5.4 in) over approximately 12 days of rainfall. This marks an increase from November's 106 mm (4.2 in), suggesting a trend towards wetter conditions as the year draws to a close. As temperatures drop and winter approaches, December's precipitation is not only heavier but also more frequent, setting the stage for a potentially snow-laden landscape. The consistent rainfall in the latter part of the year reflects a shift from the drier, warmer summer months, where average precipitation dipped to 77 mm (3.0 in) in July. This pattern underscores how Chatham's climate transitions gracefully through the seasons, with December serving as a pivotal month that bridges autumn's lingering warmth and the chill of winter.

December Precipitation Trends in Chatham

The chart displays monthly precipitation patterns in Chatham, 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.
JanFebMarAprMayJunJulAugSepOctNovDec95124119131121887783116169106138
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Chatham

In December, Chatham experiences a humidity level of 80%, marking a slight rise from the 75% recorded in the preceding months of October and September. As the year draws to a close, humidity levels during the winter months often hover around the 80% mark, similar to the preceding November. Observing the trends throughout the year, it’s evident that the highest humidity is typically found during the colder months, with January and February consistently maintaining an impressive 84%. As we transition away from the summertime lows in May and June, which see humidity levels dip to around 75%, December serves as a reminder of the area's overall moisture-laden atmosphere during winter, creating a cozy yet damp backdrop as the year wraps up.

December Average Humidity in Chatham

This chart illustrates the average monthly humidity levels in Chatham, 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 Chatham

As December rolls into Chatham, the UV Index sees a gentle decline, dropping to a low level of 2. This reduction signals a shift from the very high exposure levels experienced during the summer months, where values peaked at 10 in June and July. With a longer burn time of 45 minutes, it's a reminder to enjoy the outdoors while still practicing sun safety, albeit with less urgency than in the peak season. The trend clearly illustrates a seasonal ebb in UV radiation, reinforcing that winter sun is less intense but still calls for awareness. For more detailed information, visit Chatham UV Index.

Maximum UV Index Levels in Chatham for December

The chart shows the monthly maximum UV Index (UVI) for Chatham 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.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098642
Data source: Chatham 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 Chatham

As December unfolds in Chatham, the days gradually shorten, yielding 159 hours of sunshine, a charming yet cooler balmy finale to the year. This month's totals reveal a notable dip from the sun-drenched heights of summer, where July basked in 344 hours of brilliance. However, December's light is a gentle reminder of the cyclical beauty of the seasons, bridging the brighter months of May and June, with their expansive 298 and 325 hours, respectively. The transition from the year's peak sunshine in the summer to the crisp clarity of winter teaches us to cherish every fleeting hour, painting our days with shades of possibility and warmth, even as the year closes its book.

Monthly Sunshine Duration in Chatham: December Highlighted

The December sunshine duration represents the total number of hours Chatham 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.
JanFebMarAprMayJunJulAugSepOctNovDec136h179h257h243h298h325h344h331h280h238h202h159h
Data source: Chatham December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Chatham During December

In December, Chatham experiences a notable decline in sunny weather, with only a 26% chance of sunshine. This figure is among the lowest in the year, rivaling February’s already gloomy forecast. As winter approaches, the trend tilts toward overcast skies, especially following the more promising conditions of November, which offers a 50% likelihood of sun. The transition from the relatively brighter fall months to the darker depths of winter is evident, suggesting that if you're hoping for golden rays in December, you might need to brace for a cozier indoor experience instead.

Percentage of Sunny Days in December in Chatham

The chart illustrates the percentage of sunny days in Chatham 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 Chatham experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec34%26%56%44%41%38%38%36%51%44%50%27%
Data source: Chatham December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Chatham in December

As December arrives in Chatham, the days grow shorter, with only nine hours of daylight to embrace. This trend follows the natural ebb and flow throughout the year, starting from the lengthy fifteen hours in June during summer's peak warmth. As autumn sets in, daylight gradually diminishes, falling to eleven hours in October and nine hours again in both November and December. This cyclical pattern highlights the seasonal rhythms of the region, as the sun's presence wanes during the winter months, encouraging residents to make the most of the daylight available while anticipating the brighter days ahead in spring.

Average Daylight Hours in Chatham for December

The chart illustrates the variation in daylight duration in Chatham throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 31m10h 36m11h 58m13h 22m14h 33m15h 9m14h 49m13h 46m12h 25m11h 1m9h 48m9h 10m
Data source: Chatham daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Chatham

In Chatham, United States, December ushers in a refreshing wind, with an average speed of 7.4 m/s (17 mph). As the year winds down, it's interesting to observe a trend: while January and February typically boast the highest gusts at around 7.9 m/s and 8.0 m/s respectively, the winds gradually soften by mid-summer, dropping to their lowest in July and August. However, as autumn deepens, wind speeds begin to rise again, culminating in December matching November’s breezy strength. This month serves as a reminder of nature’s cyclical rhythms, where the crisp air invigorates the spirit, blending the remnants of fall with the arrival of winter.

Average December Wind Speed in Chatham

The chart displays monthly wind speed patterns in Chatham, 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.
JanFebMarAprMayJunJulAugSepOctNovDec7.98.07.77.16.46.75.55.16.37.17.47.4 m/s
Data source: Chatham December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Chatham Compares to Other Months

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

In December, temperatures tend to be milder with an average of 5°C (41°F) and a maximum of 15°C (60°F), while January sees a slight drop in temperature, averaging 2°C (37°F) and peaking at 12°C (54°F). December experiences more precipitation, totaling 138 mm (5.4 in) over 12 days, compared to January's 94 mm (3.7 in) across 10 days. Additionally, humidity levels are slightly higher in January at 84%, compared to December's 80%. For more details on January weather patterns, you can check out Chatham weather in January.

December and February exhibit distinct weather patterns, although both months embrace the chill of winter. In December, temperatures range from a minimum of -10°C (14°F) to a maximum of 15°C (60°F), with an average temperature of 5°C (41°F). The month experiences a total precipitation of 138 mm (5.4 in) over 12 days, accompanied by a humidity level of 80%. In contrast, February is slightly colder, with temperatures dipping from a minimum of -11°C (12°F) to a maximum of 11°C (53°F), and an average of 2°C (37°F). Precipitation in February is marginally lower at 124 mm (4.9 in), also spread across 12 days, but the humidity increases to 84%. For more specifics on February weather, you can explore Chatham weather in February.

In December, temperatures typically range from a chilly -10°C (14°F) at night to a mild 15°C (60°F) during the day, with an average temperature around 5°C (41°F). The month sees a significant amount of precipitation, totaling 138 mm (5.4 in) over approximately 12 days, accompanied by high humidity levels of 80%. In contrast, March experiences slightly warmer conditions, with temperatures fluctuating between -8°C (18°F) and 12°C (54°F), and an average of 3°C (38°F). Precipitation in March is a bit lower at 119 mm (4.7 in) over 11 days, with humidity slightly higher at 82%. For a closer look at the weather in March, visit Chatham weather in March.

December and April present quite different weather experiences. In December, temperatures can drop to a chilly -10°C (14°F), with an average of 5°C (41°F) and a maximum of 15°C (60°F). The month is also marked by significant precipitation, totaling 138 mm (5.4 in) over about 12 days, and high humidity at 80%. Conversely, April enjoys milder temperatures, ranging from a minimum of 1°C (33°F) to an average of 7°C (45°F) and a maximum of 14°C (57°F). While precipitation is slightly less at 131 mm (5.1 in) spread over 14 days, the humidity level remains similar at 79%. For those interested in more details, check out Chatham weather in April.

December and May present starkly different weather conditions. In December, temperatures range from a chilly minimum of -10°C (14°F) to a comfortable maximum of 15°C (60°F), with an average of 5°C (41°F). This month experiences significant precipitation, totaling 138 mm (5.4 in) over about 12 days, accompanied by high humidity levels at 80%. In contrast, May sees a milder climate, with temperatures varying from a minimum of 5°C (41°F) to a maximum of 19°C (66°F) and an average of 11°C (52°F). Precipitation is slightly less at 121 mm (4.8 in), also spread over 12 days, but humidity is lower at 75%. The transition from December to May marks a shift from winter's bite to the refreshing warmth of spring. For more details on the pleasant weather of May, visit Chatham weather in May.

December and June present contrasting weather conditions. In December, temperatures can plunge as low as -10°C (14°F), with an average of 5°C (41°F) and a maximum of 15°C (60°F). The month experiences considerable precipitation, totaling 138 mm (5.4 in) over 12 days, along with high humidity at 80%. In stark contrast, June offers more temperate weather with a minimum temperature of 10°C (50°F), an average of 16°C (61°F), and a maximum of 22°C (73°F). Additionally, June sees less precipitation, with only 88 mm (3.5 in) over 10 days and slightly lower humidity at 78%. For more detailed weather insights, visit Chatham weather in June.

December and July present stark contrasts in weather patterns. In December, temperatures can plunge as low as -10°C (14°F), with an average temperature of 5°C (41°F) and temperatures peaking at 15°C (60°F). This month is also quite damp, receiving 138 mm (5.4 in) of precipitation over 12 days, coupled with a humidity level of 80%. In contrast, July offers a much warmer climate with minimum temperatures around 16°C (61°F) and an average of 20°C (69°F), reaching highs of 26°C (79°F). Precipitation decreases to 77 mm (3.0 in) spread across just 8 days, and humidity levels remain slightly lower at 76%. For more details on July weather, you can check out Chatham weather in July.

December and August present starkly contrasting weather conditions. In December, temperatures can drop as low as -10°C (14°F) with an average of 5°C (41°F), while August enjoys milder weather with minimum temperatures around 16°C (61°F) and an average of 21°C (71°F). Precipitation is more frequent in December, occurring on 12 days and totaling 138 mm (5.4 in), compared to August's 83 mm (3.3 in) over 8 days. Additionally, humidity levels are relatively high in both months, with December at 80% and August slightly lower at 76%. For more details on August weather in Chatham, you can check Chatham weather in August.

December and September present contrasting weather patterns. December sees much colder temperatures, with a minimum of -10°C (14°F) and an average of only 5°C (41°F), while September enjoys milder conditions, starting from a minimum of 13°C (56°F) and averaging 19°C (66°F). Precipitation is also notable in both months, with December experiencing 138 mm (5.4 in) over 12 days, compared to September's 116 mm (4.6 in) over 10 days. The humidity in December is slightly higher at 80%, compared to September’s 75%, contributing to the overall chill of late autumn compared to the warmer early autumn ambiance. For more detailed information, check out Chatham weather in September.

December weather is markedly colder than October, with temperatures ranging from a minimum of -10°C (14°F) to a maximum of 15°C (60°F), compared to October's milder range of 4°C (40°F) to 21°C (70°F). Precipitation is slightly less in December, totaling 138 mm (5.4 in) over 12 days, while October sees a higher total of 169 mm (6.7 in) across 11 days. Additionally, December's humidity sits at 80%, which is higher than October's 75%, contributing to a chillier feel during the winter month. For more detailed insights, you can refer to Chatham weather in October.

In comparing the weather of December to November, December exhibits colder temperatures, with a minimum of -10°C (14°F) compared to November's milder minimum of -6°C (21°F). The average temperature also drops, from November's 9°C (49°F) to December's 5°C (41°F). Additionally, December experiences slightly more precipitation, totaling 138 mm (5.4 in) over 12 days, while November totals 106 mm (4.2 in) across 10 days. Despite both months maintaining a humidity level of 80%, the overall chill of December makes it feel significantly colder compared to the relatively warmer November. For further details about November weather, you can visit Chatham weather in November.

Compare Chatham's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Chatham

As December settles in, Chatham's weather transforms markedly from the milder conditions of earlier months. The drop in temperatures can be quite striking, often leading to chilly days with brisk winds and the potential for frost, especially at night. With a notable increase in precipitation, this month sees an average of 12 rainy days, contributing to a higher humidity level, which can make the cold feel more biting. Compared to the more temperate fall months, December's weather emphasizes the transition into winter, where cozy layers become essential. For those curious about Chatham’s climate throughout the year, more details can be found at Chatham Climate.