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December Weather in Port Byron, United States

Last updated: June 24, 2025

In Port Byron, United States, the average temperature in December hovers around 0°C (32°F), with a range that can dip as low as -16°C (3°F) and peak at 18°C (64°F). Expect 106 mm (4.2 in) of precipitation spread over 18 days, accompanied by a damp average humidity of 86%. Prepare for a chilly and wet month!

December Temperature in Port Byron

In December in Port Byron, the average temperature is 0°C (32°F). Maximums can reach 18°C (64°F), and minimums can dip as low as -16°C (3°F). Be sure to pack layers to stay comfortable while exploring the diverse weather conditions.

December Weather in Port Byron: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Port Byron, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Port Byron, December typically has an average temperature of 0°C (32°F), with highs reaching up to 18°C (64°F) and lows dropping to around -16°C (3°F).
JanFebMarAprMayJunJulAugSepOctNovDec262835465867737164543932
Data source: Temperature data for Port Byron 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 Port Byron

In Port Byron in December, the precipitation amount is 106 mm (4.2 in), occurring over 18 days.

December Precipitation Trends in Port Byron

The chart displays monthly precipitation patterns in Port Byron, 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 Port Byron, December typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec9494871221249417311790162103106
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Port Byron

In Port Byron in December humidity is 86%. With an average temperature of 0°C (32°F), this humidity feels like a biting chill that seeps into your bones, making travel feel uncomfortable and damp, as the cold air combines with the moisture to create a brisk sensation that may deter outdoor exploration.

December Average Humidity in Port Byron

This chart illustrates the average monthly humidity levels in Port Byron, 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 Port Byron is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%87%88%82%79%78%76%78%84%89%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Port Byron

In Port Byron in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Port Byron, you can visit Hourly UV Index in Port Byron.

Maximum UV Index Levels in Port Byron for December

The chart shows the monthly maximum UV Index (UVI) for Port Byron 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 Port Byron typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468910997632
Data source: Port Byron 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 Port Byron Compares to Other Months

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

This table compares monthly weather conditions in Port Byron, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)94 mm (3.7 inches)90%moderate
February Weather-2°C (28°F)94 mm (3.7 inches)90%moderate
March Weather1°C (35°F)86 mm (3.4 inches)87%high
April Weather8°C (46°F)122 mm (4.8 inches)88%very high
May Weather15°C (59°F)124 mm (4.9 inches)82%very high
June Weather20°C (68°F)93 mm (3.7 inches)79%very high
July Weather23°C (73°F)173 mm (6.8 inches)78%very high
August Weather22°C (71°F)117 mm (4.6 inches)76%very high
September Weather18°C (64°F)90 mm (3.5 inches)78%high
October Weather12°C (54°F)162 mm (6.4 inches)84%high
November Weather4°C (40°F)103 mm (4.1 inches)89%moderate
December Weather0°C (32°F)106 mm (4.2 inches)86%low

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