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December Weather in Monmouth, United States

Last updated: June 24, 2025

In December, the average temperature in Monmouth, United States hovers around 5°C (41°F). Expect chilly days, with temperatures dipping as low as -6°C (21°F) and occasionally reaching a comfortable 16°C (62°F). Prepare for a wet month, as rainfall accumulates to 187 mm (7.4 in) over approximately 19 days, contributing to a high average humidity of 87%.

December Temperature in Monmouth

In December in Monmouth, the average temperature is 5°C (41°F). Maximums can reach 16°C (62°F), while minimums can drop to as low as -6°C (21°F). Travelers should be prepared for a mix of chilly and mild days, so layering is recommended.

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

The chart illustrates December temperature patterns in Monmouth, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Monmouth, December typically has an average temperature of 5°C (41°F), with highs reaching up to 16°C (62°F) and lows dropping to around -6°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec414145505663686963524641
Data source: Temperature data for Monmouth 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 Monmouth

In Monmouth in December, the total precipitation amount is 187 mm (7.4 in) over the course of 19 days.

December Precipitation Trends in Monmouth

The chart displays monthly precipitation patterns in Monmouth, 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 Monmouth, December typically receives around 187 mm (7.4 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec1621741311135744466188145187
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Monmouth

In Monmouth in December humidity is 87%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket enveloping you, making every step seem laborious and the chill more biting, which can be quite challenging for traveling.

December Average Humidity in Monmouth

This chart illustrates the average monthly humidity levels in Monmouth, 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 Monmouth is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%85%83%83%84%82%74%71%81%87%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Monmouth

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

Maximum UV Index Levels in Monmouth for December

The chart shows the monthly maximum UV Index (UVI) for Monmouth 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 Monmouth typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec23679101097532
Data source: Monmouth 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 Monmouth Compares to Other Months

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

This table compares monthly weather conditions in Monmouth, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)162 mm (6.4 inches)85%low
February Weather5°C (41°F)174 mm (6.9 inches)84%moderate
March Weather7°C (45°F)131 mm (5.2 inches)85%high
April Weather10°C (50°F)113 mm (4.5 inches)83%high
May Weather13°C (56°F)57 mm (2.3 inches)83%very high
June Weather17°C (63°F)44 mm (1.7 inches)83%very high
July Weather20°C (68°F)4 mm (0.1 inches)82%very high
August Weather20°C (69°F)6 mm (0.2 inches)74%very high
September Weather17°C (63°F)61 mm (2.4 inches)71%high
October Weather11°C (53°F)88 mm (3.5 inches)81%moderate
November Weather8°C (46°F)145 mm (5.7 inches)87%moderate
December Weather5°C (41°F)187 mm (7.4 inches)87%low

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