December Weather in Arlington, United States

Last updated: February 24, 2025

In December, Arlington, United States experiences a notable variety in weather characteristics. With maximum temperatures reaching a pleasant 20°C (69°F), the month provides a stark contrast to its minimum lows of around -10°C (13°F), creating a chilly average of 5°C (41°F). This time of year witnesses approximately 93 mm (3.7 in) of precipitation over 9 days, contributing to a relatively humid atmosphere at 84%. Residents and visitors alike can expect a blend of crisp days and occasional rain, making it essential to dress warmly and stay prepared for changing conditions.

December Temperature in Arlington

In December, Arlington experiences a notable shift towards colder temperatures as winter fully sets in. The month typically starts with minimums around -10°C (13°F), making it one of the colder times of the year. On average, daily temperatures hover around 5°C (41°F), providing a brisk chill felt throughout the city. The maximum temperature reaches about 20°C (69°F), hinting at the occasional warmer spell amidst the winter chill. This trend of cooling contrasts sharply with the milder autumn months, reflecting a significant drop as the year comes to a close. As December progresses, residents can expect more frosty mornings and invigorating afternoons, perfect for cozy gatherings and holiday festivities.

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

The chart illustrates December temperature patterns in Arlington, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec374146566675807772624740
Data source: Temperature data for Arlington 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 Arlington

In December, Arlington experiences an average precipitation of 93 mm (3.7 in), which is slightly above the monthly average for the year and consistent with the wetter months that precede it. The 9 days of rainfall indicate a trend where this month is relatively dry compared to the 15 rainy days seen in the summer peak of August. Interestingly, December’s precipitation patterns maintain a balance reminiscent of the transitional months of September and October, both of which feature less rainfall but similar levels of moisture. As winter approaches, these figures highlight Arlington's seasonal shift, where the precipitation serves as a vital source for replenishing local water supplies as the colder months set in.

December Precipitation Trends in Arlington

The chart displays monthly precipitation patterns in Arlington, 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.
JanFebMarAprMayJunJulAugSepOctNovDec619887100127118157140951058193
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Arlington

As December settles in Arlington, the humidity levels hover around 84%, reflecting a slight increase from the previous month. This month’s moisture saturation is characteristic of the colder season, as humidity tends to peak during the fall and winter months. Notably, while November experienced the highest humidity at 85%, December maintains a consistent level that aligns with the trends seen since October. The year starts with similarly high humidity in January and February at 84% and 83%, respectively, indicating that Arlington faces a rather humid climate during the winter months. Overall, the gradual decline from the summer's more comfortable 72% in August to December’s dampness illustrates the region’s seasonal shifts, layering the air with moisture as it heads into the New Year.

December Average Humidity in Arlington

This chart illustrates the average monthly humidity levels in Arlington, 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%83%83%81%78%79%74%72%75%81%85%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Arlington

As the year winds down, December in Arlington, United States, brings a moderate UV Index of 3, allowing for a more relaxed approach to sun exposure with a burn time of about 30 minutes. This marks a notable decline from the peak summer months when the UV Index soared to a maximum of 10, where caution was paramount and burn times dropped to just 15 minutes. Similarly, the transitional months of September and October still boasted significant UV levels, but a steady decrease in exposure risk can be seen as we move towards winter. This trend underscores the importance of monitoring UV levels year-round, regardless of the season. For more details on the UV Index in Arlington, visit Arlington UV Index.

Maximum UV Index Levels in Arlington for December

The chart shows the monthly maximum UV Index (UVI) for Arlington 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.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098753
Data source: Arlington 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 Arlington

In Arlington, United States, the month of December brings a cozy transition into winter with a total of 191 sunlight hours. While this marks a dip compared to the vibrant sunshine of the summer months, particularly July with its peak of 356 hours, December still offers a decent dose of daylight. As the year winds down, sunlight hours gradually decrease from the height of 281 hours in May, showcasing a clear seasonal trend. Despite the chilly air, December shines brighter than its preceding months of November and October, which recorded 226 and 246 hours respectively. This gradual tapering off of sunshine invites the festive spirit, wrapping Arlington in a warm glow as the community prepares to welcome the new year.

Monthly Sunshine Duration in Arlington: December Highlighted

The December sunshine duration represents the total number of hours Arlington 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.
JanFebMarAprMayJunJulAugSepOctNovDec150h180h259h259h281h330h356h321h277h246h226h191h
Data source: Arlington December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Arlington During December

As December rolls in, the likelihood of sunny weather in Arlington, United States, stands at 37%, making it one of the cloudier months of the year. This falls below the more optimistic figures observed in recent months, particularly November, which boasts a 56% chance of sunshine. The trend suggests that while late fall offers glimpses of sun, the transition into winter brings a dip in clear skies, particularly when compared to the sunnier months like March and September. With this lower probability of radiant days, residents should be prepared for a chillier and cloudier conclusion to the year.

Percentage of Sunny Days in December in Arlington

The chart illustrates the percentage of sunny days in Arlington 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 Arlington experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec45%28%53%48%40%38%49%34%53%40%56%37%
Data source: Arlington December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Arlington in December

As December arrives in Arlington, daylight hours dip to 9 hours, mirroring the shorter days typical of winter. This trend of decreasing daylight begins in October and continues through November, where the hours of light shrink to a scant 10 hours. The month of December not only marks the end of the calendar year but also a period of deepening twilight, as the sun sets earlier and rises later. This seasonal transition highlights the cyclic nature of daylight, with January following close behind, maintaining a brief 9-hour daylight span before gradually lengthening through the spring. The gradual increase in daylight reaches its peak in June at 14 hours, only to gracefully recede again into the shorter days of autumn. This rhythm of light resonates with the seasons, providing a constant reminder of nature's ebb and flow.

Average Daylight Hours in Arlington for December

The chart illustrates the variation in daylight duration in Arlington throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 46m10h 44m11h 58m13h 14m14h 18m14h 50m14h 32m13h 36m12h 23m11h 7m10h 1m9h 28m
Data source: Arlington daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Arlington

As December settles over Arlington, the air takes on a refreshing chill with an average wind speed of 2.8 m/s (6 mph), reminiscent of the light breezes that have characterized the fall months. Following a gradual decline from the stronger winds of earlier winter months, December mirrors the gentle winds of October and November, suggesting a calmness that invites cozy gatherings indoors. This trend showcases a steady tapering of wind speeds from early spring highs of 3.3 m/s (7 mph), leading into a quieter end of the year. The fading winds can evoke a sense of peace, wrapping the landscape in a serene stillness as the community prepares for the festive season ahead.

Average December Wind Speed in Arlington

The chart displays monthly wind speed patterns in Arlington, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.03.23.33.32.82.52.21.92.62.82.92.8 m/s
Data source: Arlington December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Arlington Compares to Other Months

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

In December, temperatures in Arlington range from a minimum of -10°C (13°F) to a maximum of 20°C (69°F), with an average temperature of 5°C (41°F). The month sees a total precipitation of 93 mm (3.7 in) over approximately 9 days, while humidity remains relatively high at 84%. In contrast, January experiences colder conditions, with minimum temperatures dropping to -15°C (5°F) and a slightly warmer maximum of 22°C (71°F). The average January temperature is around 3°C (37°F), and precipitation decreases to 61 mm (2.4 in) over about 8 days, maintaining the same humidity level of 84%. For more detailed information, you can visit Arlington weather in January.

December and February exhibit some notable differences in weather patterns, yet both months share similar average temperatures. In December, temperatures range from a minimum of -10°C (13°F) to a maximum of 20°C (69°F), with an average of 5°C (41°F). Precipitation is relatively moderate, totaling 93 mm (3.7 in) over about 9 days, with humidity levels at 84%. Conversely, February experiences colder minimum temperatures at -16°C (4°F) and a higher maximum of 28°C (82°F), while maintaining the same average of 5°C (41°F). The month sees slightly increased precipitation at 98 mm (3.9 in) over 11 days, and humidity remains comparable at 83%. For more detailed information about February weather, you can check Arlington weather in February.

In December, the weather experiences a significant chill, with temperatures ranging from a minimum of -10°C (13°F) to a pleasant maximum of 20°C (69°F), averaging around 5°C (41°F). This month sees approximately 93 mm (3.7 in) of precipitation, spread over about 9 days, along with a high humidity level of 84%. In contrast, March presents a milder climate with temperatures varying from -7°C (20°F) at night to a warmer maximum of 28°C (83°F), averaging 8°C (46°F). With 87 mm (3.4 in) of precipitation over 10 days and slightly lower humidity at 83%, March showcases a transition from winter to spring. For more detailed information, check out Arlington weather in March.

In December, the weather in Arlington is quite cold, with temperatures ranging from a minimum of -10°C (13°F) to a maximum of 20°C (69°F) and an average of 5°C (41°F). The month sees significant precipitation of 93 mm (3.7 in) over approximately 9 days, accompanied by high humidity levels at 84%. In contrast, April brings milder temperatures, with a minimum of -2°C (28°F) and a maximum of 32°C (91°F), averaging 14°C (57°F). Rainfall in April is slightly higher at 100 mm (4.0 in) and occurs over 11 days, while humidity decreases slightly to 81%. For more details on the weather patterns in April, you can check Arlington weather in April.

December and May present contrasting weather patterns, with December featuring colder temperatures that range from a minimum of -10°C (13°F) to a maximum of 20°C (69°F) and an average of 5°C (41°F). This month experiences significant precipitation, totaling 93 mm (3.7 in) over approximately 9 days, coupled with high humidity levels at 84%. In contrast, May brings warmer conditions with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 34°C (94°F) and an average temperature of 19°C (66°F). May also has higher overall precipitation at 127 mm (5.0 in), distributed over 13 days, while the humidity decreases slightly to 78%. For a detailed look at the weather in May, you can visit Arlington weather in May.

December and June showcase contrasting weather patterns. In December, temperatures range from a chilly -10°C (13°F) to a mild 20°C (69°F), with an average of 5°C (41°F), accompanied by frequent precipitation on about 9 days. The high humidity level of 84% contributes to a damp and cold atmosphere. In contrast, June brings warmer temperatures, with a minimum of 9°C (48°F), an average of 24°C (75°F), and a maximum reaching up to 36°C (98°F). The month experiences slightly more precipitation, totaling 118 mm (4.7 in) over 12 days, but the humidity is lower at 79%, resulting in a more comfortable, summer-like feel. For more details, you can check Arlington weather in June.

December and July present stark contrasts in weather conditions. In December, temperatures can drop as low as -10°C (13°F) with an average of 5°C (41°F) and a peak of 20°C (69°F), accompanied by high humidity levels at 84%. The month experiences about 93 mm (3.7 in) of precipitation over 9 days. In contrast, July boasts much warmer temperatures, ranging from a minimum of 15°C (59°F) to an average of 27°C (81°F) and soaring up to a maximum of 38°C (101°F). This summer month sees even more precipitation, totaling 157 mm (6.2 in) over 12 days, though the humidity dips to 74%. For a more detailed look at July weather, check out Arlington weather in July.

December and August present starkly contrasting weather conditions. In December, temperatures can plunge to a minimum of -10°C (13°F), with an average of 5°C (41°F) and peaks reaching 20°C (69°F). The month tends to be quite humid, with 84% humidity and 93 mm (3.7 in) of precipitation spread over 9 days. In contrast, August boasts much warmer conditions, with lows of 14°C (58°F) and averages around 25°C (77°F), soaring to maximums of 37°C (99°F). This summer month sees higher rainfall at 140 mm (5.5 in) over 15 days but experiences a lower humidity of 72%. For a more detailed look at weather patterns, check out Arlington weather in August.

When comparing December and September weather, the contrasts are quite stark. December experiences much cooler temperatures, with a minimum of -10°C (13°F) and an average of 5°C (41°F), while September enjoys much milder conditions, featuring a minimum of 5°C (42°F) and an average of 22°C (72°F). Precipitation levels are similar, with December receiving 93 mm (3.7 in) over 9 days and September slightly higher at 95 mm (3.8 in) over 11 days. Additionally, December has a higher humidity level at 84%, compared to September's 75%, which contributes to a different feel of the air during these months. For more detailed information about weather during September, you can check out Arlington weather in September.

In comparing December and October weather, a stark contrast is evident in temperatures and overall climate conditions. In December, temperatures can drop as low as -10°C (13°F) and peak at around 20°C (69°F), with an average of 5°C (41°F). This month also sees a higher humidity level of 84% and around 93 mm (3.7 in) of precipitation spread over 9 days. In contrast, October enjoys much warmer temperatures, with a minimum of 1°C (34°F) and a maximum reaching up to 36°C (97°F), averaging 17°C (62°F). Although October records a slightly higher precipitation of 104 mm (4.1 in) over the same number of rainy days, the humidity is slightly lower at 81%. For more detailed information on October weather in Arlington, you can check Arlington weather in October.

In comparing the weather of December with November, we see notable differences in temperature and precipitation patterns. December experiences a wider temperature range, with minimums dropping to -10°C (13°F) and maximums reaching up to 20°C (69°F), resulting in an average temperature of 5°C (41°F). In contrast, November is slightly milder, with minimums around -6°C (21°F) and maximums up to 25°C (78°F), leading to an average of 8°C (47°F). Precipitation also increases in December, totaling 93 mm (3.7 in) over 9 days, compared to November's 81 mm (3.2 in) over just 7 days. Both months display high humidity levels, though December's humidity is marginally lower at 84%, compared to November's 85%. For those wishing to delve deeper into November's climate specifics, you can explore Arlington weather in November.

Compare Arlington's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Arlington

December in Arlington brings a noticeable shift in weather, characterized by its chillier temperatures and increased precipitation compared to the preceding months. With average highs dipping and lows reaching below freezing, the month is marked by a brisk ambiance that embraces the onset of winter. Humidity levels rise, adding to the dampness often felt on rainy days, which occur about a third of the time throughout the month. This blend of cold, wet conditions creates a unique December climate that sets the stage for a cozy, festive atmosphere. To learn more about the seasonal variations in Arlington, visit Arlington Climate.