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December Weather in Lewiston, Australia

Last updated: August 22, 2025

In Lewiston, Australia, the average temperature in December hovers around 21°C (70°F). Expect minimums as low as 9°C (48°F) and maximums reaching an impressive 44°C (111°F). With an average precipitation of just 13 mm (0.5 in) over 3 days, the air remains relatively dry, boasting an average humidity of 46%.

December Temperature in Lewiston

In December in Lewiston, the average temperature is 21°C (70°F). Maximum temperatures can reach 44°C (111°F), while minimums can drop to as low as 9°C (48°F). This temperature range makes Lewiston a destination that requires versatile clothing options for travelers seeking to enjoy both warm and cooler moments.

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

The chart illustrates December temperature patterns in Lewiston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lewiston, December typically has an average temperature of 21°C (70°F), with highs reaching up to 44°C (111°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec737169645752525256616670
Data source: Temperature data for Lewiston 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 Lewiston

In Lewiston in December, the precipitation amount is 13 mm (0.5 in) over a span of 3 days.

December Precipitation Trends in Lewiston

The chart displays monthly precipitation patterns in Lewiston, 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 Lewiston, December typically receives around 13 mm (0.5 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec161910233637425635333314
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Lewiston

In Lewiston in December humidity is 46%. With an average temperature of 21°C (70°F), this humidity feels like a pleasant and comfortable environment for traveling, allowing for enjoyable explorations without feeling overly sticky or muggy.

December Average Humidity in Lewiston

This chart illustrates the average monthly humidity levels in Lewiston, 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 Lewiston is approximately 46%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec41%46%55%66%73%76%76%70%65%51%50%46%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Lewiston

In Lewiston in December, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in Lewiston.

Maximum UV Index Levels in Lewiston for December

The chart shows the monthly maximum UV Index (UVI) for Lewiston 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 Lewiston typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141412853458101315
Data source: Lewiston 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 Lewiston Compares to Other Months

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

This table compares monthly weather conditions in Lewiston, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather23°C (74°F)16 mm (0.6 inches)41%extreme
February Weather22°C (71°F)19 mm (0.7 inches)46%extreme
March Weather21°C (69°F)10 mm (0.4 inches)55%extreme
April Weather18°C (64°F)23 mm (0.9 inches)66%very high
May Weather14°C (57°F)36 mm (1.4 inches)73%moderate
June Weather11°C (52°F)37 mm (1.4 inches)76%moderate
July Weather11°C (52°F)42 mm (1.6 inches)76%moderate
August Weather11°C (52°F)56 mm (2.2 inches)70%moderate
September Weather13°C (56°F)35 mm (1.4 inches)65%very high
October Weather16°C (61°F)32 mm (1.3 inches)51%very high
November Weather19°C (66°F)33 mm (1.3 inches)50%extreme
December Weather21°C (70°F)13 mm (0.5 inches)46%extreme

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