Last updated: February 26, 2025
Experience the charm of Heidelberg in December, where temperatures range from a brisk -6°C (21°F) to a pleasant 14°C (58°F), creating a captivating winter atmosphere. The average temperature hovers around 4°C (39°F), making it the perfect time to bundle up and explore the city's historic sights. Residents and visitors should be prepared for 19 days of precipitation, contributing to a total of 134 mm (5.3 in) of rainfall throughout the month. With humidity levels soaring at 91%, the air feels refreshingly crisp, adding to the enchanting ambiance of Heidelberg's winter landscape.
As December ushers in winter in Heidelberg, temperatures start to dip, showcasing a blend of chill and mildness that characterizes the season. With minimums hovering around -6°C (21°F), the city experiences a crispness that can amplify as the nights grow colder. However, daytime offers a more moderate climate, with an average of 4°C (39°F), allowing residents and visitors to enjoy the festive atmosphere without the harsh extremes of winter. Maximum temperatures reach up to 14°C (58°F), providing a striking contrast to the chilly nights, making December a month of transitions. Overall, this time of year illustrates a gradual shift that balances beautiful frost with moments of warmth, perfect for cozy gatherings by the fireside or leisurely strolls through the charming streets adorned with holiday decorations.
In Heidelberg, Germany, December emerges as a notably wet month, with precipitation reaching 134 mm (5.3 in) over 19 days. This spike in rainfall sets December apart from the previous months, contrasting sharply with the 57 mm (2.3 in) recorded in November and highlighting a seasonal transition. As the year draws to a close, the combination of increased precipitation and more frequent rainy days fosters a cozy, if somewhat damp, atmosphere in the city. The trend of higher rainfall continues through winter, suggesting that residents should prepare for a robust and wet finale to the year.
Heidelberg experiences a notable trend in humidity levels throughout the year, with December seeing a return to a high 91%. This uptick mirrors the damp conditions felt at the start of the year, where January also registers at 91%. As the months progress from March to May, there's a gradual decline in humidity, reaching its lowest point of 79% in May. Interestingly, humidity levels rebound in the summer months, hovering around the low 80s, before climbing back up as autumn arrives, with November matching October at 89%. The cyclical nature of humidity in Heidelberg highlights the city’s characteristic moist air, particularly as it wraps up the year in a familiar, humid embrace.
In December, Heidelberg experiences a notable dip in UV exposure, with the UV Index hitting a low of 1. This means that outdoor enthusiasts can enjoy the crisp winter air without much concern for sunburn, as the recommended burn time extends to 45 minutes. This trend is part of the colder months, where both November and January also register a low UV Index of 2, closely following the pattern established from late fall through early spring. As the year progresses, the UV Index climbs steadily, peaking during the summer months of May through July at a high of 8, where caution is crucial. For more detailed information on UV levels and trends throughout the year, visit Heidelberg UV Index.
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In Heidelberg, Germany, the month of December offers a gentle pause in the year's sunlight, with only 134 hours marking the transition into winter. As the year winds down, this is in stark contrast to the sun-drenched days of July, which boasts a peak of 413 hours. A noticeable trend emerges as the sun gradually retreats from May's vibrant 386 hours to the twilight of December, highlighting a consistent decline in daylight as the seasons change. The dual embrace of cozy holiday spirit and shorter days creates a unique atmosphere, where residents and visitors alike find charm in the crisp air and twinkling lights, making the simplicity of December sunshine all the more cherished.
In Heidelberg, Germany, the likelihood of sunny weather in December is relatively low, with only a 16% chance of sunshine. This starkly contrasts with the brighter months that precede it, where the probability steadily increases from 13% in January to a peak of 47% in April. As the year progresses towards winter, the chance of sunny days generally dips, with November already experiencing only a 20% likelihood. December wraps up the year on a subdued note, marking it as one of the least sunlit months, underscoring a clear seasonal trend where sunshine becomes a rarity as we approach the heart of winter.
In Heidelberg, Germany, December heralds the return of shorter days, with daylight lasting only about 8 hours. This month marks the end of the gradual decline in sunlight that begins in November, where daylight measures just slightly more than 9 hours. The contrast becomes particularly notable when compared to the brightness of the spring and summer months, where daylight peaks in June with an impressive 16 hours. As the year transitions from autumn's lingering daylight to winter's embrace, December is a reminder of nature's cycles, showcasing the variation in light that influences daily life. Despite the shorter days, the anticipation of increasing light returns in the subsequent months, fueling the hope for spring's revival in the coming year.
In December, the winds in Heidelberg gently stir at an average speed of 2.8 m/s (6 mph), providing a crisp yet manageable breeze that heralds the arrival of winter. As the year winds down, it's interesting to note that wind speeds have generally declined since the spring months, where May peaked at a brisk 3.5 m/s (8 mph). The patterns reveal a gradual decrease during the warmer months, with the calmest period occurring in June and September, where winds dipped to 2.1 m/s (5 mph) and 2.0 m/s (4 mph), respectively. This December's breeze, while slightly stronger than the preceding months, still reflects the overall trend of milder wind conditions as the heart of winter approaches. The subtle shift in wind patterns adds to Heidelberg's enchanting charm during the holiday season, inviting residents and visitors alike to enjoy the serene atmosphere.
The weather in Heidelberg 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 Heidelberg and find detailed weather information for every month.
December and January present a noticeable contrast in their weather patterns. In December, temperatures range from a minimum of -6°C (21°F) to a maximum of 14°C (58°F), with an average of 4°C (39°F) and significant precipitation totaling 134 mm (5.3 in) over 19 days. The humidity remains consistently high at 91%. Conversely, January tends to be colder, with a lower minimum of -13°C (9°F) and a slightly lower maximum of 13°C (55°F), leading to an average temperature of 2°C (36°F). Rainfall decreases to 78 mm (3.1 in) over 13 days, yet the humidity still holds steady at 91%. Overall, January is colder and drier compared to the wetter and milder December. For more specifics, you can visit Heidelberg weather in January.
December and February in Heidelberg exhibit notable differences in their weather patterns despite sharing the same average temperature of 4°C (39°F). December tends to be milder, with maximum temperatures reaching up to 14°C (58°F), while February sees slightly cooler conditions, peaking at 18°C (65°F). Precipitation also differs significantly; December is wetter with 134 mm (5.3 in) across 19 days, whereas February has only 72 mm (2.8 in) over 11 days, indicating a drier month overall. Additionally, humidity levels are slightly lower in February at 89%, compared to December's 91%. For further details, check out Heidelberg weather in February.
When comparing the weather in December and March, it's clear that both months present distinct climates. December typically features milder average temperatures, ranging from a minimum of -6°C (21°F) to a maximum of 14°C (58°F), while March sees slightly colder lows at -10°C (15°F) but can reach warmer highs of 23°C (73°F). Precipitation is more frequent in December, with 134 mm (5.3 in) over 19 days, compared to March's 92 mm (3.6 in) over 14 days. Humidity levels are also quite high in both months, slightly higher in December at 91%, while March exhibits a humidity of 87%. For a more detailed look at the weather patterns in March, you can check Heidelberg weather in March.
December and April present quite contrasting weather conditions. In December, temperatures can drop as low as -6°C (21°F), with an average of 4°C (39°F) and a maximum of 14°C (58°F). The month is characterized by significant precipitation, totaling 134 mm (5.3 in) over 19 days, and high humidity levels at 91%. In contrast, April sees milder temperatures with a minimum of -4°C (25°F), an average of 10°C (51°F), and a maximum reaching 27°C (80°F). Precipitation drops sharply to 35 mm (1.4 in) over just 8 days, and humidity decreases slightly to 83%. For more details on the spring climate, you can check Heidelberg weather in April.
December and May showcase stark contrasts in weather conditions. In December, temperatures can dip as low as -6°C (21°F), with an average of 4°C (39°F) and a maximum of 14°C (58°F), accompanied by high humidity at 91%. Precipitation is fairly common during this month, with 134 mm (5.3 in) spread across 19 days. Conversely, May welcomes a warmer climate, featuring minimum temperatures of 0°C (32°F), an average of 14°C (57°F), and soaring highs up to 31°C (88°F). This month experiences less rainfall, totaling 89 mm (3.5 in) over just 13 days, and a lower humidity level of 79%. To learn more about the delightful weather in May, visit Heidelberg weather in May.
In December, the weather is quite chilly, with temperatures ranging from a minimum of -6°C (21°F) to a maximum of 14°C (58°F). This month experiences significant precipitation, totaling 134 mm (5.3 in) over 19 days, accompanied by a high humidity level of 91%. In contrast, June offers much warmer conditions, with temperatures starting at a minimum of 7°C (45°F) and peaking at a maximum of 35°C (96°F). The month sees less rain, with 85 mm (3.4 in) falling across 11 days and lower humidity at 82%. For a detailed overview of June weather, you can check Heidelberg weather in June.
December and July present stark contrasts in weather. December features chillier temperatures, with an average around 4°C (39°F), and can dip as low as -6°C (21°F), making it a month often enveloped in cold. In contrast, July boasts warmer conditions, with average highs reaching 20°C (68°F) and peaks of up to 37°C (100°F). Precipitation is also notably different, with December experiencing more rainfall (134 mm over 19 days) compared to July's lighter showers (66 mm over 11 days). Humidity levels are slightly higher in December at 91%, while July maintains a relatively comfortable 83%. For more details, you can check Heidelberg weather in July.
December and August present vastly different weather experiences. In December, temperatures can drop as low as -6°C (21°F), with an average of 4°C (39°F) and a maximum of 14°C (58°F). This winter month sees significant precipitation of 134 mm (5.3 in) over 19 days, coupled with high humidity levels at 91%. In contrast, August boasts much warmer conditions, with minimum temperatures around 7°C (44°F), averages reaching 20°C (69°F), and peaks soaring to 36°C (96°F). Precipitation is considerably lower at 60 mm (2.4 in) across 12 days, and humidity is slightly reduced at 84%. For more details, you can check Heidelberg weather in August.
When comparing the weather in December and September, notable contrasts emerge. December features colder temperatures, with a minimum of -6°C (21°F) and an average of 4°C (39°F), while September enjoys a much milder climate, with temperatures ranging from a minimum of 4°C (39°F) to a comfortable average of 16°C (61°F) and a maximum of 31°C (89°F). Precipitation is significantly higher in December, totaling 134 mm (5.3 in) over 19 days, compared to September's 58 mm (2.3 in) over just 8 days. Additionally, December's humidity sits at a high 91%, slightly above September's 85%. For a deeper insight into September's climate specifics, visit Heidelberg weather in September.
When comparing the weather in December and October, notable differences emerge. December is significantly colder, with average temperatures hovering around 4°C (39°F), while October enjoys milder conditions, with averages reaching 11°C (52°F). The maximum temperature in December only climbs to 14°C (58°F), in stark contrast to October's highs of 26°C (78°F). Moreover, December experiences more precipitation, with 134 mm (5.3 in) over 19 days, compared to October’s 74 mm (2.9 in) across 13 days. Humidity levels are also higher in December at 91%, compared to 88% in October. For more detailed information on October weather, you can visit Heidelberg weather in October.
When comparing the weather in December to that of November, notable differences emerge. December experiences a chillier climate, with temperatures ranging from a minimum of -6°C (21°F) to a maximum of 14°C (58°F), which is generally cooler than November's range of -4°C (26°F) to 21°C (70°F) and an average temperature of 6°C (43°F). Precipitation also significantly increases in December, totaling 134 mm (5.3 in) over 19 days, compared to November's 57 mm (2.3 in) over just 10 days. Additionally, humidity levels are slightly higher in December at 91%, compared to November's 89%. For detailed insights on November conditions, you can visit Heidelberg weather in November.
As December settles in, Heidelberg transforms into a winter wonderland, showcasing a stark contrast to other months of the year. With its chilly temperatures often dipping to a minimum of -6°C, the city experiences a noticeable drop that invites cozy indoor gatherings and festive cheer. The high humidity of 91% coupled with frequent precipitation—averaging 19 days of rainfall—adds a dampness that makes the air feel colder. This combination of weather conditions creates a unique atmosphere, differing significantly from the more temperate seasons. For more detailed insights into how Heidelberg's climate varies throughout the year, explore Heidelberg Climate.