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December Weather in Mastic, United States

Last updated: June 24, 2025

In December, the average temperature in Mastic, United States hovers around 5°C (42°F), with a minimum dipping to -8°C (17°F) and a maximum peaking at 17°C (63°F). Expect a fair amount of rain, with 134 mm (5.3 in) of precipitation spread over 11 days. The atmosphere is notably humid, with an average humidity level of 80%.

December Temperature in Mastic

In December in Mastic, the average temperature is 5°C (42°F), with a maximum that can reach 17°C (63°F) and a minimum that can drop as low as -8°C (17°F). It's advisable to pack layers to stay comfortable during your travels.

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

The chart illustrates December temperature patterns in Mastic, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mastic, December typically has an average temperature of 5°C (42°F), with highs reaching up to 17°C (63°F) and lows dropping to around -8°C (17°F).
JanFebMarAprMayJunJulAugSepOctNovDec373841485767757569615042
Data source: Temperature data for Mastic 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 Mastic

In Mastic in December, the precipitation amount is 134 mm (5.3 in) spread over 11 days.

December Precipitation Trends in Mastic

The chart displays monthly precipitation patterns in Mastic, 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 Mastic, December typically receives around 134 mm (5.3 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec81107106122117681009887139102134
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Mastic

In Mastic in December humidity is 80%. With an average temperature of 5°C (42°F), this humidity feels like a damp chill that can seep into your bones, making outdoor adventures uncomfortable and urging travelers to seek warm shelter often.

December Average Humidity in Mastic

This chart illustrates the average monthly humidity levels in Mastic, 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 Mastic is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Mastic

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

Maximum UV Index Levels in Mastic for December

The chart shows the monthly maximum UV Index (UVI) for Mastic 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 Mastic typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Mastic 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 Mastic Compares to Other Months

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

This table compares monthly weather conditions in Mastic, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)81 mm (3.2 inches)84%moderate
February Weather3°C (38°F)107 mm (4.2 inches)82%moderate
March Weather5°C (41°F)106 mm (4.2 inches)81%high
April Weather9°C (48°F)122 mm (4.8 inches)78%very high
May Weather14°C (57°F)117 mm (4.6 inches)69%very high
June Weather19°C (67°F)68 mm (2.7 inches)69%very high
July Weather24°C (75°F)100 mm (3.9 inches)62%very high
August Weather24°C (75°F)98 mm (3.8 inches)65%very high
September Weather21°C (70°F)87 mm (3.4 inches)68%very high
October Weather16°C (62°F)139 mm (5.5 inches)74%high
November Weather10°C (50°F)102 mm (4.0 inches)82%moderate
December Weather5°C (42°F)134 mm (5.3 inches)80%low

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