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December Weather in Saint Johns, United States

Last updated: June 24, 2025

In Saint Johns, United States, the average temperature in December hovers around 0°C (32°F), with a minimum dip of -22°C (-7°F) and a pleasant maximum of 17°C (62°F). Expect around 60 mm (2.4 in) of precipitation over 9 days, accompanied by a high average humidity of 86%. Stay prepared for a chilly and damp month!

December Temperature in Saint Johns

In December in Saint Johns, the average temperature is 0°C (32°F). Maximums can reach 17°C (62°F), while minimums can plunge as low as -22°C (-7°F). Be prepared for a wide range of temperatures if you're planning to travel during this month.

December Weather in Saint Johns: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Saint Johns, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Johns, December typically has an average temperature of 0°C (32°F), with highs reaching up to 17°C (62°F) and lows dropping to around -22°C (-7°F).
JanFebMarAprMayJunJulAugSepOctNovDec252736465970757265533832
Data source: Temperature data for Saint Johns 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 Saint Johns

In Saint Johns in December, the total precipitation amount is 60 mm (2.4 in), occurring over a span of 9 days.

December Precipitation Trends in Saint Johns

The chart displays monthly precipitation patterns in Saint Johns, 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 Saint Johns, December typically receives around 60 mm (2.4 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec6366638812111768681011166360
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Saint Johns

In Saint Johns 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 Saint Johns

This chart illustrates the average monthly humidity levels in Saint Johns, 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 Saint Johns is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%85%86%80%80%80%81%80%84%90%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Saint Johns

In Saint Johns 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 Saint Johns, you can visit Hourly UV Index in Saint Johns.

Maximum UV Index Levels in Saint Johns for December

The chart shows the monthly maximum UV Index (UVI) for Saint Johns 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 Saint Johns typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
Data source: Saint Johns 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 Saint Johns Compares to Other Months

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

This table compares monthly weather conditions in Saint Johns, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)63 mm (2.5 inches)88%low
February Weather-3°C (27°F)66 mm (2.6 inches)87%moderate
March Weather2°C (36°F)63 mm (2.5 inches)85%moderate
April Weather8°C (47°F)88 mm (3.5 inches)86%very high
May Weather15°C (60°F)121 mm (4.8 inches)80%very high
June Weather21°C (70°F)117 mm (4.6 inches)80%very high
July Weather24°C (75°F)68 mm (2.7 inches)80%very high
August Weather22°C (72°F)68 mm (2.7 inches)80%very high
September Weather18°C (65°F)101 mm (4.0 inches)80%high
October Weather12°C (53°F)116 mm (4.6 inches)84%moderate
November Weather3°C (38°F)63 mm (2.5 inches)89%moderate
December Weather0°C (32°F)60 mm (2.4 inches)86%low

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