nomadseason

December Weather in Diamond City, United States

Last updated: June 24, 2025

In December, the average temperature in Diamond City, United States hovers around 6°C (43°F). Expect a minimum chill of -10°C (14°F) and a maximum warm-up to 26°C (79°F). The month brings about 78 mm (3.1 in) of precipitation over 8 days, with humidity levels averaging a high 87%.

December Temperature in Diamond City

In December in Diamond City, the average temperature is 6°C (43°F). The maximum can reach 26°C (79°F), while the minimum can drop as low as -10°C (14°F). Be sure to pack layers to stay comfortable and prepared for fluctuating temperatures during your travels.

December Weather in Diamond City: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Diamond City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Diamond City, December typically has an average temperature of 6°C (43°F), with highs reaching up to 26°C (79°F) and lows dropping to around -10°C (14°F).
JanFebMarAprMayJunJulAugSepOctNovDec374051576776807874614843
Data source: Temperature data for Diamond City generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Diamond City

In Diamond City in December, the total precipitation amount is 78 mm (3.1 in) over the course of 8 days.

December Precipitation Trends in Diamond City

The chart displays monthly precipitation patterns in Diamond City, 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 Diamond City, December typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec80991441591829377125511207278
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Diamond City

In Diamond City in December, humidity is 87%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and necessitating warm, breathable layers for traveling.

December Average Humidity in Diamond City

This chart illustrates the average monthly humidity levels in Diamond City, 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 Diamond City is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%78%76%78%83%83%78%68%64%70%83%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Diamond City

In Diamond City in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Diamond City, you can check the information here.

Maximum UV Index Levels in Diamond City for December

The chart shows the monthly maximum UV Index (UVI) for Diamond City 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 Diamond City typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36810111111109753
Data source: Diamond City 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 Diamond City Compares to Other Months

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

This table compares monthly weather conditions in Diamond City, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)80 mm (3.2 inches)81%moderate
February Weather5°C (40°F)99 mm (3.9 inches)78%high
March Weather10°C (51°F)144 mm (5.7 inches)76%very high
April Weather14°C (57°F)159 mm (6.3 inches)78%very high
May Weather20°C (67°F)182 mm (7.2 inches)83%extreme
June Weather24°C (76°F)93 mm (3.7 inches)83%extreme
July Weather27°C (80°F)77 mm (3.0 inches)78%extreme
August Weather25°C (78°F)125 mm (4.9 inches)68%very high
September Weather23°C (74°F)51 mm (2.0 inches)64%very high
October Weather16°C (61°F)119 mm (4.7 inches)70%high
November Weather9°C (48°F)72 mm (2.8 inches)83%moderate
December Weather6°C (43°F)78 mm (3.1 inches)87%moderate

Compare Diamond City's Climate with Cities Worldwide