Last updated: August 21, 2025
December in Si'an, China presents a brisk yet charming climate, with temperatures ranging from a maximum of 20°C (68°F) to a chilly minimum of -7°C (20°F). The average temperature settles at around 7°C (45°F), providing a refreshing atmosphere for residents and visitors alike. This month witnesses 44 mm (1.7 in) of precipitation over approximately 8 days, contributing to the region's vibrant winter landscape. With a humidity level of 73%, the air holds a crisp quality that enhances the seasonal experience, making it an intriguing time to explore the historical and cultural richness of Si'an.
In December, Si'an, China, experiences a notable drop in temperatures as winter sets in, with nightly lows dipping to -7°C (20°F) and daytime highs reaching 20°C (68°F). This month showcases a transition into colder weather compared to the milder conditions of autumn, as the average temperature hovers around 7°C (45°F). The chill in the air is evident, especially when compared to the gradually increasing warmth observed from January through November. As the year draws to a close, Si'an's inhabitants can expect brisk days and crisp nights, making it a perfect time for warm gatherings and festive celebrations amidst the winter backdrop.
In December, Si'an, China experiences a slight decline in precipitation, with 44 mm (1.7 inches) of rainfall over 8 days. This marks the end of a wetter season characterized by peak rainfall in July and June, where totals reached 231 mm (9.1 inches) and 131 mm (5.2 inches), respectively. As temperatures cool, the precipitation gradually tapers off from the lush greenery of the summer months, reflecting a shift toward drier winter conditions. Compared to the preceding months of November and October, which recorded 53 mm (2.1 inches) and 58 mm (2.3 inches), December's rainfall indicates a steady contraction in overall wet days and volume, signaling the transition into a more stable seasonal climate.
In Si'an, China, December ushers in a noticeable shift in humidity levels, settling at 73%. While this marks a drop from the summer peak of 95% in July, the humidity remains elevated compared to the cooler months of January and October, which see figures around 67% and 76%, respectively. This pattern suggests a gradual decline as the year draws to a close, following a consistent upward trend from late winter to the height of summer. The month of December, with its relatively moderate humidity, hints at a transitional climate, balancing the lingering moisture of the fall with the crispness that winter brings. Overall, the trend showcases Si'an's humid subtropical climate, where the winter months maintain a comfortable level of humidity that supports the region's unique ecosystem.
In December, Si'an experiences a moderate UV Index of 4, with the potential for mild sunburn occurring after about 30 minutes of sun exposure. This marks a noticeable drop from the peak levels seen during the mid-year months, where values soared to an extreme 11 in both July and August. As temperatures cool and daylight decreases, the UV ratings in Si'an transition from the very high categories earlier in the year, ensuring that December is a more approachable month for sun-related activities. For a detailed overview of UV trends throughout the year, visit Si'an UV Index.
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In December, Si'an, China bids farewell to the year's crispness with a respectable 220 hours of sunshine. While the month trails behind the sunniest summer peak of 308 hours in August, it still offers a charming transition into winter. Notably, the sunshine hours begin to wane from the spring high of 265 hours in April, illustrating the seasonal ebb in brightness. However, December's moderate daylight, which outshines the earlier months of January through November, offers a glimmer of warmth and light amidst the chill, making it a delightful time to explore the city's rich history and vibrant culture. This month acts as a gentle reminder of the sun's resilience, preparing the way for the brighter months ahead.
As winter unfolds in Si'an, December brings a promising 62% chance of sunny weather, making it one of the brightest months of the year. This marks a notable increase from the preceding months, with November already showing a healthy 60% sunshine likelihood. Interestingly, the overall trend reveals a dip in sunny days during the summer months, particularly in July when the chance plummets to just 21%. As temperatures drop, residents and visitors alike can embrace December's inviting sunshine—a delightful contrast to the gloomy trends seen in earlier months.
In Si'an, China, the rhythm of daylight dances through the seasons, peaking during the summer months. Starting with 10 hours of daylight in January, the hours gradually increase, reaching a vibrant 14 hours in June. As summer transitions to fall, there's a gentle decline, with daylight dwindling to 10 hours again by December. This cyclical pattern highlights the clear shift from longer, sun-soaked days in spring and summer to the serene but shorter days of winter, creating a comforting predictability in the yearly ebb and flow of natural light.
As December settles over Si'an, the average wind speed gently dips to 3.1 m/s (7 mph), marking the quietest breezes of the year. This subtle decrease reflects a trend observed from the lively gusts of summer, particularly in July, when winds reached up to 4.5 m/s (10 mph). Following the bustling warmth, the transition into the cooler months sees winds moderate, with November’s winds tapering off to a steady 3.4 m/s (8 mph). December's calmness invites a sense of tranquility, embodying the quiet resilience of winter as the gentle, cool air envelops the landscape, wrapping Si'an in a serene embrace.
Weather in Si'an varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Si'an, focusing on differences in temperature, rainfall, humidity, and UV levels.
In December, temperatures in Si'an range from a minimum of -7°C (20°F) to a maximum of 20°C (68°F), with an average temperature of 7°C (45°F). The month experiences 44 mm (1.7 in) of precipitation over 8 days, contributing to a relatively high humidity level of 73%.
Conversely, January sees slightly lower temperatures, with a minimum of -8°C (17°F) and a maximum of 18°C (64°F), resulting in an average of 5°C (41°F). Precipitation increases slightly to 47 mm (1.8 in), also spread over 8 days, but humidity decreases to 67%.
For more details about January weather patterns, you can refer to Si'an weather in January.
In December, temperatures range from a minimum of -7°C (20°F) to a maximum of 20°C (68°F), with an average of 7°C (45°F). The month sees about 44 mm (1.7 in) of precipitation over 8 days, accompanied by a humidity level of 73%. In contrast, February experiences slightly milder temperatures, with a minimum of -5°C (23°F) and a maximum reaching 24°C (75°F), averaging 6°C (43°F). Precipitation increases to 52 mm (2.0 in) over the same number of days, and humidity decreases slightly to 69%. For a detailed look at February weather patterns, check out Si'an weather in February.
In December, temperatures typically range from a chilly -7°C (20°F) to a moderate high of 20°C (68°F), with an average of 7°C (45°F), reflecting the heart of winter. The month sees about 44 mm (1.7 in) of precipitation, spread over 8 days, and maintaining a humidity level of 73%. In contrast, March experiences a milder climate, with temperatures ranging from a minimum of 0°C (33°F) to a maximum of 27°C (81°F), averaging at 11°C (51°F). Precipitation increases slightly to 56 mm (2.2 in) over 9 days, alongside a higher humidity level of 79%. For a more detailed view of March weather, check out Si'an weather in March.
In December, the weather tends to be quite chilly, with temperatures ranging from a minimum of -7°C (20°F) to a maximum of 20°C (68°F) and averaging around 7°C (45°F). The month sees about 44 mm (1.7 in) of precipitation over 8 days, accompanied by a humidity level of 73%. In contrast, April brings a noticeable warming trend, with temperatures varying from a minimum of 4°C (39°F) to a peak of 30°C (87°F), averaging at 15°C (59°F). This month experiences increased precipitation at 70 mm (2.8 in) over the same number of days, but with higher humidity levels at 86%. For more specifics about April weather, you can visit Si'an weather in April.
December and May present dramatically contrasting weather patterns. In December, temperatures range from a chilly -7°C (20°F) to a mild 20°C (68°F), with an average of about 7°C (45°F). The month sees approximately 44 mm (1.7 in) of precipitation over 8 days, and the humidity is a moderate 73%. In stark contrast, May experiences much warmer temperatures, with a minimum of 9°C (49°F), an average of 21°C (69°F), and a maximum of 35°C (95°F). Precipitation in May is higher, totaling about 112 mm (4.4 in) over 9 days, accompanied by increased humidity at 87%. For a more detailed look at the weather in May, you can check Si'an weather in May.
December and June present stark contrasts in weather patterns. In December, temperatures range from a chilly -7°C (20°F) at their lowest to a mild 20°C (68°F) at their highest, with an average of 7°C (45°F). The month sees around 44 mm (1.7 in) of precipitation over 8 days, coupled with a humidity level of 73%. In contrast, June boasts significantly warmer temperatures, with minimums around 16°C (61°F) and maximums soaring up to 37°C (99°F), leading to an average of 24°C (76°F). This month experiences higher rainfall, with a total of 131 mm (5.2 in) over 10 days, and humidity increases to a muggy 90%. For a more detailed look at the weather in June, visit Si'an weather in June.
December and July present stark contrasts in weather. In December, temperatures range from a chilly minimum of -7°C (20°F) to a comfortable maximum of 20°C (68°F), with an average of 7°C (45°F). The month experiences relatively low precipitation, totaling 44 mm (1.7 in) over 8 days, accompanied by humidity levels at 73%. In contrast, July features a much warmer climate, with temperatures soaring from a minimum of 18°C (65°F) to a scorching maximum of 39°C (103°F), averaging around 28°C (82°F). This summer month is also marked by significantly higher precipitation, reaching 231 mm (9.1 in) over 17 days, and a much higher humidity level of 95%. For a closer look at July weather specifics, you can check Si'an weather in July.
December and August present stark contrasts in weather conditions. In December, temperatures range from a chilly -7°C (20°F) at night to a pleasant 20°C (68°F) during the day, with an average of 7°C (45°F). The month experiences moderate precipitation of 44 mm (1.7 in) over about 8 days and maintains a humidity level of 73%. In contrast, August boasts warm temperatures that span from a minimum of 21°C (71°F) to a sizzling 37°C (99°F), averaging 28°C (84°F). This summer month is significantly wetter, with 192 mm (7.6 in) of rain occurring over 14 days, along with a higher humidity of 92%. For those interested in more detailed August weather specifics, you can visit Si'an weather in August.
December weather is significantly cooler than September, with temperatures ranging from a chilly -7°C (20°F) at night to a mild average of 7°C (45°F) during the day, peaking at 20°C (68°F). In contrast, September enjoys much warmer temperatures, with nighttime lows at 16°C (61°F) and daytime averages soaring to 24°C (76°F), and highs reaching a sweltering 34°C (94°F). Additionally, December experiences about 44 mm (1.7 in) of precipitation over 8 days, while September sees much more rain, totaling 142 mm (5.6 in) across 11 days. Humidity levels are relatively similar, with September being slightly more humid at 79% compared to December's 73%. For more details on September weather, you can visit Si'an weather in September.
December weather is significantly colder compared to October, with temperatures ranging from a minimum of -7°C (20°F) to a maximum of 20°C (68°F). In contrast, October enjoys much milder conditions, with temperatures between 8°C (47°F) and 32°C (90°F). Additionally, October experiences slightly higher precipitation at 58 mm (2.3 in) over 7 days, while December records 44 mm (1.7 in) over 8 days. Humidity levels are fairly similar, with December at 73% and October slightly higher at 76%. For more details on October's conditions, you can explore Si'an weather in October.
In comparing the weather between November and December, we can observe notable differences in temperature and precipitation. November brings milder conditions with an average temperature of 13°C (56°F), while December experiences cooler averages at 7°C (45°F). The maximum temperatures in November can reach up to 27°C (81°F), significantly higher than December's peak of 20°C (68°F). Although November has slightly more precipitation at 53 mm (2.1 in) over 7 days, December is characterized by a chillier environment with 44 mm (1.7 in) and 8 days of rain. Humidity levels are also higher in November at 77%, compared to December's 73%. For a more detailed look at November weather, check out Si'an weather in November.
As December sets in, Si'an experiences a notable transition in its weather, characterized by cooler temperatures and increased humidity. With the average hovering around 7°C (45°F), this month breaks away from the milder conditions of autumn, introducing chilly nights that can plunge to -7°C (20°F). While precipitation is relatively low at 44 mm (1.7 in) over just 8 days, the dampness in the air amplifies the cold, making it feel crisper. This month marks the beginning of winter in Si'an, a time for cozy gatherings as the landscape takes on a serene, frosty charm. For a deeper understanding of how Si'an’s climate evolves throughout the year, visit Si'an Climate.