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December Weather in Walla Walla, Australia

Last updated: August 22, 2025

In December, the average temperature in Walla Walla, Australia hovers around 22°C (72°F). However, temperatures can vary significantly, with minimums dipping to a cool 6°C (44°F) and maximums soaring to a scorching 42°C (107°F). Expect about 49 mm (1.9 in) of precipitation spread across 6 days, and enjoy an average humidity level of 51% for a balanced, comfortable climate.

December Temperature in Walla Walla

In December in Walla Walla, the average temperature is 22°C (72°F), with maximums reaching up to 42°C (107°F) and minimums dropping as low as 6°C (44°F). Be prepared for a wide range of temperatures when planning your travel.

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

The chart illustrates December temperature patterns in Walla Walla, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Walla Walla, December typically has an average temperature of 22°C (72°F), with highs reaching up to 42°C (107°F) and lows dropping to around 6°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec777369605246464752596572
Data source: Temperature data for Walla Walla 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 Walla Walla

In Walla Walla in December, the precipitation amount is 49 mm (1.9 in) over the course of 6 days.

December Precipitation Trends in Walla Walla

The chart displays monthly precipitation patterns in Walla Walla, 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 Walla Walla, December typically receives around 49 mm (1.9 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec362855445355626245638249
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Walla Walla

In Walla Walla in December, humidity is 51%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, making it comfortable for exploring the sights while still refreshing enough for outdoor activities.

December Average Humidity in Walla Walla

This chart illustrates the average monthly humidity levels in Walla Walla, 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 Walla Walla is approximately 51%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec42%51%60%68%76%81%83%78%72%57%53%51%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Walla Walla

In Walla Walla in December, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Walla Walla, you can check here.

Maximum UV Index Levels in Walla Walla for December

The chart shows the monthly maximum UV Index (UVI) for Walla Walla 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 Walla Walla typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141312853357101214
Data source: Walla Walla 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 Walla Walla Compares to Other Months

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

This table compares monthly weather conditions in Walla Walla, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (77°F)36 mm (1.4 inches)42%extreme
February Weather23°C (73°F)28 mm (1.1 inches)51%extreme
March Weather21°C (69°F)55 mm (2.2 inches)59%extreme
April Weather16°C (61°F)44 mm (1.7 inches)68%very high
May Weather11°C (52°F)53 mm (2.1 inches)76%moderate
June Weather8°C (46°F)55 mm (2.2 inches)81%moderate
July Weather8°C (46°F)62 mm (2.5 inches)83%moderate
August Weather8°C (47°F)62 mm (2.4 inches)78%moderate
September Weather11°C (52°F)45 mm (1.8 inches)72%high
October Weather15°C (59°F)63 mm (2.5 inches)57%very high
November Weather18°C (65°F)82 mm (3.2 inches)53%extreme
December Weather22°C (72°F)49 mm (1.9 inches)51%extreme

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