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December Weather in Hillsboro, United States

Last updated: June 24, 2025

In December, the average temperature in Hillsboro, United States is a crisp 11°C (52°F). Expect fluctuations, with minimums dipping to -7°C (20°F) and maximums reaching up to 26°C (80°F). During this month, you'll likely experience around 121 mm (4.8 in) of precipitation over 12 days, contributing to a notable average humidity of 88%.

December Temperature in Hillsboro

In December, in Hillsboro, the average temperature is 11°C (52°F). Maximum temperatures can reach 26°C (80°F), while minimums can drop to as low as -7°C (20°F). Be prepared for a wide range of weather conditions when traveling during this time.

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

The chart illustrates December temperature patterns in Hillsboro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hillsboro, December typically has an average temperature of 11°C (52°F), with highs reaching up to 26°C (80°F) and lows dropping to around -7°C (20°F).
JanFebMarAprMayJunJulAugSepOctNovDec485360647379818178685551
Data source: Temperature data for Hillsboro 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 Hillsboro

In Hillsboro in December, the precipitation amount reaches 121 mm (4.8 in) over the course of 12 days.

December Precipitation Trends in Hillsboro

The chart displays monthly precipitation patterns in Hillsboro, 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 Hillsboro, December typically receives around 121 mm (4.8 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec1091591261631321551091381009671121
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Hillsboro

In Hillsboro in December, humidity is 88%. With an average temperature of 11°C (52°F), this humidity feels like a heavy blanket wrapping around you, making travel uncomfortable and the air feel thick, encouraging you to seek shelter or stay hydrated as you explore.

December Average Humidity in Hillsboro

This chart illustrates the average monthly humidity levels in Hillsboro, 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 Hillsboro is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%82%79%82%77%74%73%85%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Hillsboro

In Hillsboro in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Hillsboro for better planning.

Maximum UV Index Levels in Hillsboro for December

The chart shows the monthly maximum UV Index (UVI) for Hillsboro 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 Hillsboro typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478111112111110864
Data source: Hillsboro 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 Hillsboro Compares to Other Months

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

This table compares monthly weather conditions in Hillsboro, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)109 mm (4.3 inches)85%moderate
February Weather12°C (53°F)159 mm (6.3 inches)84%high
March Weather16°C (60°F)126 mm (5.0 inches)82%very high
April Weather18°C (64°F)163 mm (6.4 inches)82%extreme
May Weather23°C (74°F)132 mm (5.2 inches)82%extreme
June Weather26°C (79°F)155 mm (6.1 inches)79%extreme
July Weather27°C (81°F)109 mm (4.3 inches)82%extreme
August Weather27°C (81°F)138 mm (5.4 inches)77%extreme
September Weather25°C (78°F)100 mm (3.9 inches)74%very high
October Weather20°C (69°F)96 mm (3.8 inches)73%very high
November Weather13°C (55°F)70 mm (2.8 inches)85%high
December Weather11°C (52°F)121 mm (4.8 inches)88%moderate

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