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December Weather in Lewiston, United States

Last updated: June 24, 2025

In Lewiston, United States, the average temperature in December hovers around 4°C (39°F). Expect a few chilly surprises with minimums dipping to -5°C (22°F), while daytime highs can reach a pleasant 19°C (67°F). This month sees 118 mm (4.6 in) of precipitation over approximately 11 days, contributing to an average humidity of 86%. Perfect for cozy indoor adventures!

December Temperature in Lewiston

In December in Lewiston, the average temperature is 4°C (39°F), with maximums reaching 19°C (67°F) and minimums dropping as low as -5°C (22°F). This variability makes it essential for travelers to pack accordingly and be prepared for both chilly and mild conditions.

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 4°C (39°F), with highs reaching up to 19°C (67°F) and lows dropping to around -5°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec394144515969777567564639
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 118 mm (4.6 in) over the course of 11 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 118 mm (4.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec16315613782621624125297118
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 86%. With an average temperature of 4°C (39°F), this humidity feels like a chilly mist enveloping you, making it essential to bundle up while exploring, as each breath comes with a damp chill that can be quite refreshing yet starkly invigorating for travelers.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%85%82%81%79%70%60%62%72%87%86%
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 is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Lewiston, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579111111109643
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 Weather4°C (40°F)163 mm (6.4 inches)86%moderate
February Weather5°C (41°F)156 mm (6.1 inches)85%moderate
March Weather7°C (44°F)137 mm (5.4 inches)85%high
April Weather11°C (51°F)82 mm (3.2 inches)82%very high
May Weather15°C (59°F)62 mm (2.4 inches)81%extreme
June Weather20°C (69°F)15 mm (0.6 inches)79%extreme
July Weather25°C (77°F)2 mm (0.1 inches)70%extreme
August Weather24°C (76°F)4 mm (0.1 inches)60%very high
September Weather20°C (68°F)12 mm (0.5 inches)62%very high
October Weather13°C (56°F)52 mm (2.0 inches)72%high
November Weather8°C (46°F)97 mm (3.8 inches)87%moderate
December Weather4°C (39°F)118 mm (4.6 inches)86%moderate

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