Last updated: August 31, 2025
In Blenheim, New Zealand, December experiences a delightful array of weather, showcasing a maximum temperature of 25°C (77°F) and an average of 16°C (61°F). With a minimum temperature dipping to 6°C (43°F), this month offers a pleasant warmth amidst the cooler nights. However, it’s also the season of occasional rain, as evidenced by 101 mm (4.0 in) of precipitation spread over 12 days, contributing to a relatively high humidity level of 81%. Whether you're exploring the vineyards or enjoying outdoor activities, December's weather in Blenheim provides a refreshing backdrop for summer adventures.
In December, Blenheim, New Zealand experiences a delightful summer ambiance characterized by mild temperatures and plenty of sunshine. The month begins with a minimum of 6°C (43°F) and dances towards a comfortable maximum of 25°C (77°F), with an average temperature settling at 16°C (61°F). This marks a clear upward trend from the preceding months, reflecting the region's transition into the height of summer. As the year winds down, the nights remain cool yet pleasant, making December a wonderful time for outdoor activities and enjoying the enchanting scenery that Blenheim has to offer.
In December, Blenheim experiences a notable uptick in precipitation, with total rainfall reaching 101 mm (4.0 in), the highest of the year. This increase signifies the transition into the wetter summer months, as December also sees a rise in the number of precipitation days, averaging 12 days. This trend reflects a shift from the drier late spring months, painting a picture of a lively landscape ready for the festive season. With more rain falling, outdoor activities may require some flexibility, but the lush surroundings created by this December downpour offer a vibrant backdrop to the holiday cheer.
In Blenheim, New Zealand, December experiences a slight dip in humidity, registering at 81%, just a notch below the 82% recorded in November. This minor decline is part of a broader trend where humidity levels see a gradual rise from the warmer months of January to May, peaking at 84% in May, before ascending to 86% during the winter months of June and July. As the year transitions, humidity levels generally stabilize during the latter part of the year, hovering around the low 80s%. This consistent humidity pattern reflects Blenheim's unique climate, offering a mild and pleasantly moist environment throughout the year.
In Blenheim, New Zealand, December marks the peak of sun intensity, with a striking UV Index of 13, categorizing the exposure as extreme. This level of UV radiation means that you can expect to burn in just 10 minutes without adequate protection. The trend throughout the warmer months shows consistently high UV levels; both January and February also record an index of 13, underscoring the need for vigilant sun safety during this time. As the seasons transition into autumn, the UV Index drops significantly, peaking at 9 in March before descending to lower levels in the winter months. For residents and visitors alike, being aware of the Blenheim UV Index is crucial for enjoying the stunning summer days while safeguarding against potential skin damage. For more detailed information, check out the full profile at Blenheim UV Index.
UV Risk Categories
Blenheim, New Zealand, basks in a radiant glow during December, boasting an impressive 351 hours of sunshine. This peak in sunlight occurs as the region transitions from the shorter, cooler days of winter to the vibrant warmth of summer. December's abundant sunshine sets the stage for an uplifting pattern, as sunshine hours steadily increase through the spring months, culminating in the year's brightest December. Following a consistent trend, sunlight in Blenheim showcases a healthy climb from 220 hours in May, with each month building anticipation for the sunny celebration of summer. This delightful trend not only enhances the outdoor experience in December but also highlights the region’s appeal as a sunny getaway.
In December, Blenheim, New Zealand experiences a 34% chance of sunny weather, which aligns with a notable trend of decreasing sunshine opportunities as the year winds down. Following the sunnier months of January and February, where sunny chances peak at 55% and 46%, respectively, the likelihood of clear skies gradually diminishes through spring and into the early summer. This downward trend highlights that while December can still offer some bright days, it's essential for visitors to prepare for a mix of weather, as sunnier months are already behind them.
In Blenheim, New Zealand, December marks the peak of daylight duration, basking in an impressive 15 hours of sunlight, which represents a delightful culmination of the gradual increase that begins in June. Following the shortest days of winter, where daylight lingers at just 9 hours, spring ushers in longer evenings as daylight stretches to 10 hours by August and reaches 11 hours in September. This gradual transition continues into the warmer months, culminating in 14 hours by November. As the year winds down, residents and visitors alike can savor the abundance of natural light in December, radiating a sense of vibrancy and energy that characterizes the festive season.
In December, Blenheim's average wind speed settles at 4.3 m/s (10 mph), creating a pleasantly breezy atmosphere as the year draws to a close. This moderate wind speed is consistent with the trend observed in recent months, where the winds began to pick up after a dip in mid-winter; notably, September recorded the highest average at 5.2 m/s (12 mph). As summer approaches, the winds remain a gentle companion, reflecting the region's characteristic climate. Overall, December's breezes echo the fluctuations of the previous months while maintaining a steady, refreshing sensation that enhances the charm of Blenheim’s summer landscape.
Weather in Blenheim varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Blenheim, focusing on differences in temperature, rainfall, humidity, and UV levels.
In December, the weather exhibits a wider range of temperatures, with minimums around 6°C (43°F) and maximums reaching up to 25°C (77°F). This month also sees higher precipitation levels, averaging 101 mm (4.0 in) over approximately 12 days, and maintaining a humidity level of 81%. In contrast, January tends to be slightly warmer, with minimum temperatures of 7°C (45°F) and an average high of 29°C (84°F). Additionally, it experiences significantly less rainfall, totaling only 41 mm (1.6 in) over just 6 days, resulting in a slightly lower humidity of 79%. For more detailed insights, you can check out Blenheim weather in January.
In December, the weather tends to be warmer, with average temperatures ranging from a minimum of 6°C (43°F) to a maximum of 25°C (77°F). The month experiences significant rainfall, averaging 101 mm (4.0 in) over 12 days, and maintains a relatively high humidity level of 81%. In contrast, February offers slightly milder conditions, with temperatures from a minimum of 8°C (46°F) to a maximum of 28°C (82°F). This month sees less precipitation, totaling 67 mm (2.6 in) over just 6 days, and a slightly lower humidity of 79%. For more detailed insights, check out Blenheim weather in February.
In December, the weather typically features mild temperatures, with minimums around 6°C (43°F) and maximums reaching 25°C (77°F). The month sees an average temperature of 16°C (61°F) and experiences 101 mm (4.0 in) of precipitation over approximately 12 days, accompanied by a high humidity of 81%. In contrast, March offers slightly warmer minimum temperatures at 7°C (44°F) and a marginally cooler average of 15°C (60°F), with maximums peaking at 24°C (76°F). Precipitation decreases to 66 mm (2.6 in) over about 8 days, and humidity remains relatively similar at 79%. For more details on March weather, visit Blenheim weather in March.
December and April exhibit distinct weather patterns, with December being warmer overall. In December, temperatures range from a minimum of 6°C (43°F) to a maximum of 25°C (77°F), with an average of 16°C (61°F). The month experiences around 101 mm (4.0 in) of precipitation over 12 days, accompanied by high humidity at 81%. In contrast, April has slightly cooler temperatures, with a minimum of 4°C (39°F) and a maximum of 22°C (71°F), resulting in an average of 13°C (56°F). Precipitation is similar at 98 mm (3.9 in), but it occurs over just 8 days, while humidity remains relatively close at 80%. For more details, you can check Blenheim weather in April.
In December, the weather is generally warmer, with temperatures ranging from a minimum of 6°C (43°F) to a maximum of 25°C (77°F), and an average of 16°C (61°F). The month experiences higher precipitation levels as well, with 101 mm (4.0 in) falling over 12 days, while maintaining a humidity level of 81%. In contrast, May sees cooler temperatures, with a minimum of 1°C (35°F), an average of 11°C (52°F), and a maximum of 19°C (67°F). Precipitation in May is lower at 76 mm (3.0 in) over 8 days, with humidity slightly higher at 84%. For more detailed insights, you can check out Blenheim weather in May.
December and June present contrasting weather conditions. In December, temperatures range from a mild 6°C (43°F) at night to a warm 25°C (77°F) during the day, with an average of 16°C (61°F). The month sees substantial precipitation, totaling 101 mm (4.0 in) over about 12 days, and humidity levels sit at 81%. In contrast, June experiences cooler temperatures, with a minimum of 1°C (35°F) and a maximum of 17°C (63°F), yielding an average of 9°C (48°F). While June has slightly less rainfall at 77 mm (3.0 in) over 10 days, it has higher humidity at 86%. These differences highlight the seasonal transition from the warmer, wetter conditions of December to the cooler climate typical of June. For more details, check out Blenheim weather in June.
When comparing the weather in December and July, significant differences emerge in temperature and overall climate conditions. December experiences milder temperatures, with averages ranging from a minimum of 6°C (43°F) to a maximum of 25°C (77°F), making it much warmer than July, where temperatures vary from 1°C (34°F) to a maximum of 15°C (59°F). While both months see roughly the same amount of precipitation, with December at 101 mm (4.0 in) and July at 97 mm (3.8 in), December's higher average humidity at 81% compared to July's 86% creates a distinctly different feel. For a more detailed look at July conditions, you can refer to Blenheim weather in July.
December and August present contrasting weather patterns. In December, temperatures range from a minimum of 6°C (43°F) to a maximum of 25°C (77°F), with an average of 16°C (61°F). The month experiences relatively high humidity at 81% and sees about 101 mm (4.0 in) of precipitation over 12 days. On the other hand, August features cooler temperatures, with a minimum of 1°C (34°F) and a maximum of 18°C (65°F), averaging just 9°C (48°F). While August is slightly drier with 73 mm (2.9 in) of precipitation over 10 days, it also maintains a high humidity level of 83%. For more details on August weather, you can visit Blenheim weather in August.
In comparing the weather between December and September, December generally offers warmer temperatures, with a minimum of 6°C (43°F) and an average high of 25°C (77°F), compared to September’s cooler minimum of 1°C (34°F) and a maximum of 18°C (65°F). Precipitation is slightly higher in December, totaling 101 mm (4.0 in) over 12 rainy days, whereas September sees about 82 mm (3.2 in) over 10 days. Humidity levels remain similar, with December at 81% and September slightly higher at 83%. For a more detailed look at September weather specifics, you can visit Blenheim weather in September.
In December, the weather is generally warmer compared to October, with average temperatures ranging from a minimum of 6°C (43°F) to a maximum of 25°C (77°F), while October sees temperatures from 2°C (36°F) to 20°C (69°F). Additionally, December experiences more precipitation, totaling 101 mm (4.0 in) over 12 days, compared to October's 76 mm (3.0 in) over 11 days. The humidity levels are quite similar, with December at 81% and October slightly higher at 82%. For more details, you can check Blenheim weather in October.
In comparing the weather of December and November, December tends to be slightly warmer, with average temperatures ranging from a minimum of 6°C (43°F) to a maximum of 25°C (77°F), compared to November's temperatures of 5°C (41°F) to 24°C (75°F). Additionally, December experiences more precipitation, totaling 101 mm (4.0 in) over 12 days, while November accumulates 81 mm (3.2 in) over 11 days. Humidity levels remain relatively consistent, with December at 81% and November at 82%. For a more detailed look at November conditions, check out Blenheim weather in November.
In December, Blenheim transitions into the warmth of summer, presenting a contrast to the cooler months with its pleasant temperatures averaging around 16°C (61°F) and peaking at a high of 25°C (77°F). While the days are generally sunnier, December tends to see a moderate level of rain, with precipitation recorded on about 12 days throughout the month, making for a humid atmosphere at around 81%. This unique blend of warmth and moisture sets the stage for lush landscapes and vibrant outdoor activities, distinctly setting December apart from the drier and cooler conditions earlier in the year. For more insights on Blenheim’s varied weather patterns, delve into Blenheim Climate.