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December Weather in Riverton, New Zealand

Last updated: August 31, 2025

In December, the average temperature in Riverton, New Zealand hovers around 14°C (57°F), with daily variations ranging from a cool 5°C (40°F) to a warm 26°C (79°F). Expect an average precipitation of 119 mm (4.7 in) spread over 17 days, contributing to a notable average humidity of 83%.

December Temperature in Riverton

In December in Riverton, the average temperature is 14°C (57°F). Maximums can reach 26°C (79°F), while minimums can drop as low as 5°C (40°F). It’s a great time to explore Riverton with mild temperatures perfect for outdoor activities.

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

The chart illustrates December temperature patterns in Riverton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Riverton, December typically has an average temperature of 14°C (57°F), with highs reaching up to 26°C (79°F) and lows dropping to around 5°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec585856524944444648515457
Data source: Temperature data for Riverton generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Riverton

In Riverton in December, the precipitation amount is 119 mm (4.7 in) spread across 17 days.

December Precipitation Trends in Riverton

The chart displays monthly precipitation patterns in Riverton, 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. In Riverton, December typically receives around 119 mm (4.7 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec10612794991018510596131126123119
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Riverton

In Riverton in December, humidity is 83%. With an average temperature of 14°C (57°F), this humidity feels like you're stepping into a warm, damp embrace that can make outdoor activities quite uncomfortable, often leaving you sweaty and exhausted if you're not prepared with plenty of water and breathable clothing.

December Average Humidity in Riverton

This chart illustrates the average monthly humidity levels in Riverton, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Riverton is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%82%84%84%85%85%85%84%83%82%83%83%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Riverton

In Riverton in December, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Riverton.

Maximum UV Index Levels in Riverton for December

The chart shows the monthly maximum UV Index (UVI) for Riverton 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. In December, the maximum UV index in Riverton typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec121185322358912
Data source: Riverton 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.

How December Weather in Riverton Compares to Other Months

Weather in Riverton varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Riverton, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Riverton, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather15°C (59°F)106 mm (4.2 inches)83%extreme
February Weather14°C (58°F)127 mm (5.0 inches)82%extreme
March Weather13°C (57°F)94 mm (3.7 inches)84%very high
April Weather11°C (53°F)99 mm (3.9 inches)84%moderate
May Weather9°C (49°F)101 mm (4.0 inches)85%moderate
June Weather7°C (45°F)85 mm (3.3 inches)85%low
July Weather7°C (44°F)105 mm (4.1 inches)85%low
August Weather8°C (46°F)96 mm (3.8 inches)84%moderate
September Weather9°C (48°F)131 mm (5.2 inches)83%moderate
October Weather10°C (51°F)126 mm (4.9 inches)82%very high
November Weather12°C (54°F)123 mm (4.9 inches)82%very high
December Weather14°C (57°F)119 mm (4.7 inches)83%extreme

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