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December Weather in Martinsburg, United States

Last updated: June 24, 2025

In December, the average temperature in Martinsburg, United States hovers around 2°C (35°F), with extremes ranging from a chilly -14°C (6°F) to a surprisingly warm 20°C (68°F). Expect a precipitation amount of 90 mm (3.5 in) over about 10 days, contributing to an average humidity of 88%. Dress warmly and be prepared for damp conditions!

December Temperature in Martinsburg

In December in Martinsburg, the average temperature is 2°C (35°F). Maximums can reach 20°C (68°F), while minimums can drop to as low as -14°C (6°F). Be sure to pack layers for your trip, as the temperature can vary significantly throughout the day.

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

The chart illustrates December temperature patterns in Martinsburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Martinsburg, December typically has an average temperature of 2°C (35°F), with highs reaching up to 20°C (68°F) and lows dropping to around -14°C (6°F).
JanFebMarAprMayJunJulAugSepOctNovDec303440506169757367564135
Data source: Temperature data for Martinsburg 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 Martinsburg

In Martinsburg in December, the precipitation amount is 90 mm (3.5 in) over the course of 10 days.

December Precipitation Trends in Martinsburg

The chart displays monthly precipitation patterns in Martinsburg, 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 Martinsburg, December typically receives around 90 mm (3.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec6210290104122113111981281107390
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Martinsburg

In Martinsburg in December, humidity is 88%. With an average temperature of 2°C (35°F), this humidity feels like you're wrapped in a cold, damp blanket, making outdoor activities uncomfortable and travel challenging due to the chill seeping into your bones.

December Average Humidity in Martinsburg

This chart illustrates the average monthly humidity levels in Martinsburg, 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 Martinsburg is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%89%88%80%79%74%64%67%81%89%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Martinsburg

In Martinsburg 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 Martinsburg, you can check the information here.

Maximum UV Index Levels in Martinsburg for December

The chart shows the monthly maximum UV Index (UVI) for Martinsburg 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 Martinsburg typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098643
Data source: Martinsburg 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 Martinsburg Compares to Other Months

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

This table compares monthly weather conditions in Martinsburg, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)62 mm (2.4 inches)89%moderate
February Weather1°C (34°F)102 mm (4.0 inches)90%moderate
March Weather4°C (40°F)90 mm (3.5 inches)89%high
April Weather10°C (51°F)104 mm (4.1 inches)88%very high
May Weather16°C (61°F)122 mm (4.8 inches)80%very high
June Weather21°C (69°F)113 mm (4.4 inches)79%very high
July Weather24°C (75°F)111 mm (4.4 inches)74%very high
August Weather23°C (73°F)98 mm (3.8 inches)64%very high
September Weather19°C (67°F)128 mm (5.0 inches)67%very high
October Weather13°C (56°F)110 mm (4.3 inches)81%high
November Weather5°C (41°F)73 mm (2.9 inches)89%moderate
December Weather2°C (35°F)90 mm (3.5 inches)88%moderate

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