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December Weather in Long Hill, United States

Last updated: June 24, 2025

In Long Hill, United States, the average temperature in December hovers around 4°C (40°F). During this time, you can expect a minimum chill of -11°C (12°F) and a pleasant maximum of 16°C (61°F). Be prepared for some moisture, as precipitation totals reach 141 mm (5.6 in) over approximately 11 days, while the air remains relatively damp with an average humidity of 80%.

December Temperature in Long Hill

In December in Long Hill, the average temperature is 4°C (40°F). Maximum temperatures can reach 16°C (61°F), while minimums can plummet to -11°C (12°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

December Weather in Long Hill: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Long Hill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Long Hill, December typically has an average temperature of 4°C (40°F), with highs reaching up to 16°C (61°F) and lows dropping to around -11°C (12°F).
JanFebMarAprMayJunJulAugSepOctNovDec353639465564727268604840
Data source: Temperature data for Long Hill 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 Long Hill

In Long Hill in December, the total precipitation amount is 141 mm (5.6 in) spread over 11 days.

December Precipitation Trends in Long Hill

The chart displays monthly precipitation patterns in Long Hill, 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 Long Hill, December typically receives around 141 mm (5.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec8310910813611984115101101157113141
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Long Hill

In Long Hill in December, humidity is 80%. With an average temperature of 4°C (40°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and requiring careful planning for warmth and moisture management.

December Average Humidity in Long Hill

This chart illustrates the average monthly humidity levels in Long Hill, 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 Long Hill is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%82%79%75%78%76%76%76%75%80%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Long Hill

In Long Hill 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 Long Hill, you can visit Hourly UV Index in Long Hill.

Maximum UV Index Levels in Long Hill for December

The chart shows the monthly maximum UV Index (UVI) for Long Hill 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 Long Hill typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689101098642
Data source: Long Hill 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 Long Hill Compares to Other Months

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

This table compares monthly weather conditions in Long Hill, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)83 mm (3.3 inches)84%moderate
February Weather2°C (36°F)109 mm (4.3 inches)84%moderate
March Weather4°C (39°F)108 mm (4.3 inches)82%high
April Weather8°C (47°F)136 mm (5.3 inches)79%very high
May Weather13°C (55°F)119 mm (4.7 inches)75%very high
June Weather18°C (64°F)84 mm (3.3 inches)78%very high
July Weather22°C (72°F)115 mm (4.5 inches)76%very high
August Weather22°C (73°F)101 mm (4.0 inches)76%very high
September Weather20°C (68°F)101 mm (4.0 inches)75%very high
October Weather16°C (60°F)157 mm (6.2 inches)75%high
November Weather9°C (49°F)113 mm (4.4 inches)80%moderate
December Weather4°C (40°F)141 mm (5.6 inches)80%low

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