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December Weather in Saint Johnsville, United States

Last updated: June 24, 2025

In December, the average temperature in Saint Johnsville, United States hovers around -2°C (28°F). Prepare for a chilly climate, with minimum temperatures plummeting to -24°C (-12°F), while the mercury can rise to a pleasant 16°C (61°F) on warmer days. Expect about 114 mm (4.5 in) of precipitation spread across 14 days, contributing to a high average humidity level of 84%.

December Temperature in Saint Johnsville

In December in Saint Johnsville, the average temperature is -2°C (28°F), with maximums reaching up to 16°C (61°F) and minimums dropping as low as -24°C (-12°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to enjoy their time in Saint Johnsville.

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

The chart illustrates December temperature patterns in Saint Johnsville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Johnsville, December typically has an average temperature of -2°C (28°F), with highs reaching up to 16°C (61°F) and lows dropping to around -24°C (-12°F).
JanFebMarAprMayJunJulAugSepOctNovDec222532445765706861513628
Data source: Temperature data for Saint Johnsville 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 Johnsville

In Saint Johnsville in December, the total precipitation amount is 114 mm (4.5 in) over the course of 14 days.

December Precipitation Trends in Saint Johnsville

The chart displays monthly precipitation patterns in Saint Johnsville, 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 Johnsville, December typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec931109413213111914312996170117114
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Saint Johnsville

In Saint Johnsville in December humidity is 84%. With an average temperature of -2°C (28°F), this humidity feels like a biting chill that cuts through layers of clothing, making outdoor activities uncomfortable and travel challenging.

December Average Humidity in Saint Johnsville

This chart illustrates the average monthly humidity levels in Saint Johnsville, 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 Johnsville is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%84%76%72%67%64%72%81%87%85%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Saint Johnsville

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

Maximum UV Index Levels in Saint Johnsville for December

The chart shows the monthly maximum UV Index (UVI) for Saint Johnsville 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 Johnsville typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468910998632
Data source: Saint Johnsville 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 Johnsville Compares to Other Months

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

This table compares monthly weather conditions in Saint Johnsville, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)93 mm (3.7 inches)89%moderate
February Weather-4°C (26°F)110 mm (4.3 inches)88%moderate
March Weather0°C (32°F)94 mm (3.7 inches)86%high
April Weather7°C (44°F)132 mm (5.2 inches)84%very high
May Weather14°C (57°F)131 mm (5.2 inches)76%very high
June Weather18°C (65°F)119 mm (4.7 inches)72%very high
July Weather21°C (70°F)143 mm (5.6 inches)66%very high
August Weather20°C (68°F)129 mm (5.1 inches)64%very high
September Weather16°C (62°F)96 mm (3.8 inches)72%very high
October Weather10°C (51°F)170 mm (6.7 inches)81%high
November Weather2°C (36°F)117 mm (4.6 inches)87%moderate
December Weather-2°C (28°F)114 mm (4.5 inches)84%low

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