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December Weather in Byron, United States

Last updated: June 24, 2025

In December, the average temperature in Byron, United States hovers around 0°C (31°F). Expect temperatures to dip as low as -21°C (-6°F) and peak at a warm 19°C (67°F). Be prepared for some precipitation, totaling 50 mm (2.0 in) over approximately 6 days, coupled with a high average humidity of 81%.

December Temperature in Byron

In December in Byron, the average temperature is 0°C (31°F), with maximums reaching 19°C (67°F) and minimums dropping as low as -21°C (-6°F). Be prepared for a wide range of temperatures if you plan to travel during this time.

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

The chart illustrates December temperature patterns in Byron, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Byron, December typically has an average temperature of 0°C (31°F), with highs reaching up to 19°C (67°F) and lows dropping to around -21°C (-6°F).
JanFebMarAprMayJunJulAugSepOctNovDec232538486172757267533731
Data source: Temperature data for 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 Byron

In Byron in December, the precipitation amount is 50 mm (2.0 in) over the course of 6 days.

December Precipitation Trends in Byron

The chart displays monthly precipitation patterns in 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 Byron, December typically receives around 50 mm (2.0 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec60547110315011873821191124750
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Byron

In Byron in December, humidity is 81%. With an average temperature of 0°C (31°F), this humidity feels like a brisk chill that seeps into your bones, making travel outdoors invigorating yet a bit uncomfortable, as each breath is a reminder of the moist air enveloping you.

December Average Humidity in Byron

This chart illustrates the average monthly humidity levels in 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 Byron is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Byron

In 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 Byron, you can visit Hourly UV Index in Byron.

Maximum UV Index Levels in Byron for December

The chart shows the monthly maximum UV Index (UVI) for 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 Byron typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098532
Data source: 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 Byron Compares to Other Months

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

This table compares monthly weather conditions in Byron, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)60 mm (2.4 inches)85%moderate
February Weather-4°C (25°F)54 mm (2.1 inches)85%moderate
March Weather3°C (39°F)71 mm (2.8 inches)85%high
April Weather9°C (48°F)103 mm (4.1 inches)85%very high
May Weather16°C (61°F)150 mm (5.9 inches)78%very high
June Weather22°C (72°F)118 mm (4.6 inches)80%very high
July Weather24°C (76°F)73 mm (2.9 inches)78%very high
August Weather22°C (73°F)82 mm (3.2 inches)76%very high
September Weather19°C (67°F)119 mm (4.7 inches)79%very high
October Weather12°C (53°F)112 mm (4.4 inches)83%moderate
November Weather3°C (38°F)47 mm (1.9 inches)88%moderate
December Weather0°C (31°F)50 mm (2.0 inches)81%low

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