December Weather in Baltimore, United States

Last updated: February 24, 2025

December in Baltimore is characterized by a chilly climate marked by a maximum temperature of 17°C (64°F) and a chilly average of 5°C (41°F). The month can bring brisk conditions, with minimum temperatures dipping to -9°C (16°F). Rainfall is a consistent feature, with 116 mm (4.6 in) of precipitation spread over 9 days, contributing to a notably high humidity level of 84%. As the year closes, Baltimore presents a unique blend of winter chill and the potential for cozy indoor experiences.

December Temperature in Baltimore

In Baltimore, December ushers in a chill that reflects the heart of winter, with temperatures ranging from a brisk -9°C (16°F) at night to a mild 17°C (64°F) during the day. The average temperature hovers around 5°C (41°F), indicating a noticeable drop from the preceding months. As the city dips into the colder season, the maximum daytime temperatures begin to stabilize, highlighting a trend of cooler weather following the warm autumn months. This transition creates a cozy atmosphere as the festive holiday spirit takes hold, making December a unique blend of winter’s embrace and seasonal celebrations.

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

The chart illustrates December temperature patterns in Baltimore, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec363945556474807772624841
Data source: Temperature data for Baltimore 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 Baltimore

In December, Baltimore experiences a noticeable shift in its precipitation patterns as the year comes to a close. Concluding with 116 mm (4.6 in) of rainfall over 9 days, this month stands out for its significant contribution to the annual total. While the precipitation amount is slightly lower than the wetter summer months, it remains consistent with the autumn's trend, which saw November wrapping up with 90 mm (3.6 in) over just 8 days. This steady rainfall, characteristic of the season, supports the transition from the dry late fall into the wet winter months, ensuring that the city is well-hydrated as it braces for the colder weather ahead. Overall, December's precipitation reflects a balanced climate, marking a crucial seasonal shift in Baltimore’s weather dynamics.

December Precipitation Trends in Baltimore

The chart displays monthly precipitation patterns in Baltimore, 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.
JanFebMarAprMayJunJulAugSepOctNovDec701179911414510615114311112390116
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Baltimore

In Baltimore, December ushers in a humidity level of 84%, closely mirroring the intense moisture found at the beginning of the year. The trend shows a subtle fluctuation, with winter months generally characterized by higher humidity levels. January and November peak at 84% and 85%, respectively, while spring and summer months experience a gentle decline—July reaching its lowest at 74%. This pattern suggests that while December’s atmosphere remains quite humid, it signals a gradual transition towards drier months ahead, as the city prepares for the colder winter climate. Embracing this seasonal shift not only enriches the city’s vibrant culture but also highlights Baltimore's unique weather character.

December Average Humidity in Baltimore

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

In December, Baltimore experiences a moderate UV Index of 3, with a burn time of approximately 30 minutes. This trend indicates a seasonal dip in UV exposure compared to the summer months, where values soar to 10 during June and July, marking the city’s highest risk periods for sunburn. In contrast, the early winter months reflect a more forgiving environment for outdoor activities, aligning closely with January's similar UV readings. As a result, residents can enjoy the crisp winter air while keeping their sun safety measures in check. For more information on UV levels throughout the year, visit Baltimore UV Index.

Maximum UV Index Levels in Baltimore for December

The chart shows the monthly maximum UV Index (UVI) for Baltimore 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: Baltimore 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 Baltimore

In Baltimore, December brings a cozy close to the year, with an average of 190 hours of sunshine illuminating the city. While this marks a dip from the sun-drenched summer months, which boast over 350 hours in July, it’s a positive light compared to the dreary chill of January, with only 151 hours to brighten the winter days. December’s sunshine reflects a steady transition through the seasons, where longer days of spring and summer gradually give way to the shorter days of fall and winter. Interestingly, sunshine remains relatively consistent throughout the fall, with November providing 226 hours before December's arrival, revealing a trend of lingering light as we approach the year’s end. As the holiday season unfolds, residents can still enjoy the gentle rays of December sun, a comforting reminder that even in the colder months, Baltimore holds onto its rays.

Monthly Sunshine Duration in Baltimore: December Highlighted

The December sunshine duration represents the total number of hours Baltimore 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.
JanFebMarAprMayJunJulAugSepOctNovDec151h182h261h268h297h339h359h329h281h250h226h190h
Data source: Baltimore December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Baltimore During December

In December, Baltimore's likelihood of sunny weather is relatively modest at 36%, making it one of the less bright months of the year. This trend reflects a dip in sunshine as winter approaches, following a slightly more optimistic November, which boasts a 55% chance of sun. Interestingly, the chances of sunny days fluctuate throughout the year, peaking in early spring with 53% in March and reaching a low in February at just 28%. While December may not offer many sun-soaked days, the gradual increase in sunny weather from the bleakness of winter into early spring hints at brighter prospects for the months ahead.

Percentage of Sunny Days in December in Baltimore

The chart illustrates the percentage of sunny days in Baltimore 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 Baltimore experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec46%28%53%46%40%39%51%35%54%41%55%36%
Data source: Baltimore December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Baltimore in December

In Baltimore, the trend in daylight duration throughout the year paints a clear picture of the changing seasons. As winter sets in, December offers just 9 hours of daylight, mirroring January's sparse light. This is part of a gradual decrease from the brighter summer months, where daylight peaks at 14 hours in June, July, and August. As autumn arrives, daylight gradually dwindles, providing 12 hours in September and slipping further to 10 hours by November. Approaching the new year, the cycle continues as daylight begins to increase again, hinting at the promise of spring and longer days ahead. This rhythmic ebb and flow of light not only marks the passage of time but also influences the daily lives and activities of the residents in this vibrant city.

Average Daylight Hours in Baltimore for December

The chart illustrates the variation in daylight duration in Baltimore throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 45m10h 43m11h 58m13h 15m14h 19m14h 51m14h 34m13h 36m12h 23m11h 7m10h9h 26m
Data source: Baltimore daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Baltimore

As December rolls into Baltimore, residents can expect a gentle breeze averaging 3.4 m/s (8 mph), marking a slight drop from the windier months of late fall. Following November’s more robust 3.9 m/s (9 mph) winds, December's calming gusts signal a transition towards the quieter winter season. Interestingly, this trend mirrors the gradual decline in wind speed observed from late summer through fall, reaching its lowest point as the year closes. While January typically ushers in similar conditions with a comparable speed, the less tumultuous December winds provide a serene backdrop for holiday festivities and winter preparations in the charming streets of Baltimore.

Average December Wind Speed in Baltimore

The chart displays monthly wind speed patterns in Baltimore, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.84.14.14.03.73.33.02.63.53.73.93.4 m/s
Data source: Baltimore December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Baltimore Compares to Other Months

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

December and January share similar humidity levels at 84%, but January tends to be colder overall. The minimum temperature in January drops to -13°C (9°F), compared to -9°C (16°F) in December, while the average temperature decreases slightly from 5°C (41°F) in December to 2°C (36°F) in January. Additionally, January experiences less precipitation, with only 70 mm (2.8 in) over 8 days, compared to December's 116 mm (4.6 in) over 9 days. For more details on January's weather, you can visit Baltimore weather in January.

December and February both bring chilly conditions, but February tends to be slightly colder with a minimum temperature dropping to -14°C (8°F) compared to December's -9°C (16°F). The average temperatures are comparable, with December averaging 5°C (41°F) and February averaging 4°C (39°F). Interestingly, February sees a maximum temperature reach up to 20°C (69°F), slightly warmer than December’s high of 17°C (64°F). Precipitation levels are similar, with December receiving 116 mm (4.6 in) over 9 days and February experiencing 117 mm (4.6 in) over 12 days. Humidity remains relatively constant, hovering around 84% in December and dropping slightly to 83% in February. For more detailed insights, you can check out Baltimore weather in February.

December and March present contrasting weather conditions, with December characterized by colder temperatures, ranging from a minimum of -9°C (16°F) to a maximum of 17°C (64°F), and an average of 5°C (41°F). This month typically experiences more precipitation, totaling 116 mm (4.6 in) over 9 days, and maintains a high humidity level of 84%. In comparison, March offers a slightly milder climate, with temperatures varying from a minimum of -7°C (20°F) to a maximum of 24°C (75°F), resulting in a higher average of 7°C (45°F). With 99 mm (3.9 in) of precipitation spread over 10 days and a humidity level of 83%, March is a transitional month that hints at the coming warmth of spring. For more specific insights, check out Baltimore weather in March.

December and April in Baltimore exhibit stark contrasts in weather. December's temperatures range from a chilling minimum of -9°C (16°F) to a relatively mild maximum of 17°C (64°F), while April boasts a more temperate climate with minimums starting at 0°C (32°F) and maximums reaching 27°C (81°F). Both months experience similar precipitation levels, with December recording 116 mm (4.6 in) over 9 days and April slightly lower at 114 mm (4.5 in) over 11 days. Humidity remains high in December at 84%, but drops slightly in April to 81%, creating a more comfortable atmosphere as spring approaches. For more detail on Baltimore's April weather, see Baltimore weather in April.

December and May present a stark contrast in weather conditions, reflecting the changing seasons. In December, temperatures can drop as low as -9°C (16°F), with an average of 5°C (41°F) and a maximum of 17°C (64°F). The month sees significant precipitation, totaling 116 mm (4.6 in) over about 9 days, with a humidity level of 84%, making it feel quite chilly.

In contrast, May experiences much milder temperatures, with a minimum of 3°C (38°F), an average of 18°C (65°F), and peaks reaching up to 30°C (87°F). This month also has more rainfall, with 145 mm (5.7 in) spread across about 14 days, but the humidity is lower at 78%, contributing to a more comfortable atmosphere. For a more detailed look at the climate during this transitional month, visit Baltimore weather in May.

In December, the weather features a much colder climate, with temperatures ranging from a chilly -9°C (16°F) to a mild 17°C (64°F), and an average of 5°C (41°F). The month experiences significant precipitation of 116 mm (4.6 in) over about 9 days, coupled with a high humidity level of 84%. In contrast, June enjoys a warmer atmosphere with temperatures typically between 11°C (52°F) and a maximum of 32°C (90°F), averaging around 23°C (74°F). Precipitation is slightly lower at 106 mm (4.2 in), spread over 14 days, and the humidity decreases to 79%. For a more detailed overview, check out Baltimore weather in June.

December and July present stark contrasts in weather conditions. In December, temperatures can dip as low as -9°C (16°F), with an average of 5°C (41°F) and a maximum of 17°C (64°F). The month also experiences higher humidity at 84% and receives about 116 mm (4.6 in) of precipitation over 9 days. In comparison, July boasts much warmer temperatures, with a minimum of 17°C (63°F), an average of 27°C (80°F), and a peak of 35°C (96°F). Though it is warmer, July sees slightly more precipitation at 151 mm (6.0 in) over 13 days, along with lower humidity levels at 74%. For more details on July weather, you can check Baltimore weather in July.

December and August present strikingly different weather conditions. In December, temperatures can plunge to a minimum of -9°C (16°F), with an average around 5°C (41°F) and highs reaching up to 17°C (64°F). This month experiences significant precipitation of 116 mm (4.6 in) over about 9 days, coupled with high humidity at 84%. In contrast, August offers a much warmer climate, with temperatures ranging from a minimum of 16°C (62°F) to an average of 25°C (78°F) and maximum temperatures soaring to 33°C (92°F). While it sees higher rainfall at 143 mm (5.6 in), this occurs over 16 days, and humidity is notably lower at 72%. For more details on the warm summer weather, check out Baltimore weather in August.

In December, the weather is notably colder, with temperatures ranging from a chilly -9°C (16°F) to a mild maximum of 17°C (64°F), whereas September boasts much warmer conditions, with temperatures varying from a minimum of 9°C (49°F) to a high of 32°C (89°F). While both months experience similar precipitation levels—116 mm (4.6 in) in December compared to 111 mm (4.4 in) in September—December tends to bring a higher humidity of 84%, compared to September's 75%. Overall, December's climate steers towards winter chill, while September embraces the warmth of late summer. For more details on September's weather, you can check Baltimore weather in September.

When comparing the weather in December and October, it's evident that December experiences much colder temperatures, with daily averages around 5°C (41°F) and a minimum that can plunge to -9°C (16°F). In contrast, October boasts a mild climate, with an average temperature of 17°C (63°F) and daytime highs reaching as high as 32°C (91°F). Precipitation levels are somewhat comparable, with December receiving 116 mm (4.6 in) over 9 days, while October has slightly higher precipitation at 123 mm (4.8 in) over 11 days. Humidity levels are also relatively similar, with December at 84% and October at 81%. For more details on October weather specifically, you can check this link: Baltimore weather in October.

December's weather presents a sharper chill compared to November, with average temperatures dropping from a mild 9°C (48°F) in November to around 5°C (41°F) in December. The minimum temperatures are notably lower as well, reaching -9°C (16°F) in December, compared to -4°C (26°F) in November. Additionally, December sees an increase in precipitation, totaling 116 mm (4.6 in) over 9 days, while November experiences slightly less at 90 mm (3.6 in) over 8 days. The humidity levels remain comparable, with December at 84% and November at 85%. For a more detailed look at November weather, you can check Baltimore weather in November.

Compare Baltimore's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Baltimore

As December settles over Baltimore, it ushers in a distinct transition, with temperatures noticeably cooler and a significant uptick in humidity that can make the chilly air feel even sharper. Unlike the mild temperatures of fall, the average temperature dips, and you may even experience colder days marked by frosty mornings. Precipitation is not uncommon, with rain falling on about nine days throughout the month, adding to the winter atmosphere. The contrast between the crisp days and the vibrant holiday spirit creates a unique charm for this time of year. For more insights into how December compares to the rest of the year, visit Baltimore Climate.