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December Weather in Roslyn, United States

Last updated: June 24, 2025

In December, the average temperature in Roslyn, United States hovers around -3°C (27°F), with extremes ranging from a chilling -21°C (-5°F) to a milder 11°C (52°F). Expect precipitation of about 164 mm (6.4 in) over 18 days, creating a notably moist environment with an average humidity of 88%.

December Temperature in Roslyn

In December in Roslyn, the average temperature is -3°C (27°F). The maximum can reach 11°C (52°F), while the minimum can plunge to as low as -21°C (-5°F). Travelers should be prepared for chilly conditions and pack accordingly for variable temperatures.

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

The chart illustrates December temperature patterns in Roslyn, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Roslyn, December typically has an average temperature of -3°C (27°F), with highs reaching up to 11°C (52°F) and lows dropping to around -21°C (-5°F).
JanFebMarAprMayJunJulAugSepOctNovDec272632384853606153413327
Data source: Temperature data for Roslyn 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 Roslyn

In Roslyn in December, the precipitation amount is 164 mm (6.4 in) over the course of 18 days.

December Precipitation Trends in Roslyn

The chart displays monthly precipitation patterns in Roslyn, 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 Roslyn, December typically receives around 164 mm (6.4 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec148170947953387751112131164
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Roslyn

In Roslyn in December humidity is 88%. With an average temperature of -3°C (27°F), this humidity feels like a biting chill that seeps into your bones, making outdoor exploration less inviting as the dampness clings to your clothing and slows your movements.

December Average Humidity in Roslyn

This chart illustrates the average monthly humidity levels in Roslyn, 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 Roslyn is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%87%84%81%82%79%63%62%83%89%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Roslyn

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

Maximum UV Index Levels in Roslyn for December

The chart shows the monthly maximum UV Index (UVI) for Roslyn 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 Roslyn typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec246710101098532
Data source: Roslyn 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 Roslyn Compares to Other Months

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

This table compares monthly weather conditions in Roslyn, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)148 mm (5.8 inches)86%low
February Weather-3°C (26°F)170 mm (6.7 inches)86%moderate
March Weather0°C (33°F)94 mm (3.7 inches)87%high
April Weather3°C (38°F)79 mm (3.1 inches)84%high
May Weather9°C (48°F)53 mm (2.1 inches)81%very high
June Weather12°C (54°F)38 mm (1.5 inches)82%very high
July Weather15°C (60°F)7 mm (0.3 inches)79%very high
August Weather16°C (61°F)7 mm (0.3 inches)63%very high
September Weather12°C (53°F)51 mm (2.0 inches)62%very high
October Weather5°C (41°F)112 mm (4.4 inches)83%moderate
November Weather1°C (33°F)131 mm (5.1 inches)89%moderate
December Weather-3°C (27°F)164 mm (6.4 inches)88%low

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