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December Weather in Myrtle, United States

Last updated: June 24, 2025

In December, the average temperature in Myrtle, United States is a brisk 9°C (48°F). Expect a chilly minimum of -7°C (20°F), while temperatures can soar up to 25°C (77°F). With 150 mm (5.9 in) of precipitation spread over 11 days, it's wise to carry an umbrella. The air is quite humid, with an average humidity level of 88%, making for a damp but vibrant atmosphere.

December Temperature in Myrtle

In December in Myrtle, the average temperature is 9°C (48°F). Maximums can reach 25°C (77°F), while minimums can drop as low as -7°C (20°F). Travelers should be prepared for a wide range of temperatures, making layering essential for comfort during their visit.

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

The chart illustrates December temperature patterns in Myrtle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Myrtle, December typically has an average temperature of 9°C (48°F), with highs reaching up to 25°C (77°F) and lows dropping to around -7°C (20°F).
JanFebMarAprMayJunJulAugSepOctNovDec444856617278818076655148
Data source: Temperature data for Myrtle 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 Myrtle

In Myrtle in December, the total precipitation amount reaches 150 mm (5.9 in) over the course of 11 days.

December Precipitation Trends in Myrtle

The chart displays monthly precipitation patterns in Myrtle, 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 Myrtle, December typically receives around 150 mm (5.9 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec12018815714611013311811311610679150
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Myrtle

In Myrtle in December, humidity is 88%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill settling into your bones, making outdoor exploration feel heavy and oppressive.

December Average Humidity in Myrtle

This chart illustrates the average monthly humidity levels in Myrtle, 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 Myrtle is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%84%81%83%83%80%74%70%73%85%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Myrtle

In Myrtle in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Myrtle for better planning.

Maximum UV Index Levels in Myrtle for December

The chart shows the monthly maximum UV Index (UVI) for Myrtle 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 Myrtle typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109764
Data source: Myrtle 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 Myrtle Compares to Other Months

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

This table compares monthly weather conditions in Myrtle, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)120 mm (4.7 inches)86%moderate
February Weather9°C (48°F)188 mm (7.4 inches)85%high
March Weather14°C (57°F)157 mm (6.2 inches)84%very high
April Weather16°C (62°F)146 mm (5.8 inches)81%very high
May Weather22°C (72°F)110 mm (4.3 inches)83%extreme
June Weather26°C (78°F)133 mm (5.2 inches)83%extreme
July Weather27°C (81°F)118 mm (4.6 inches)80%extreme
August Weather26°C (80°F)113 mm (4.4 inches)73%very high
September Weather24°C (76°F)116 mm (4.6 inches)70%very high
October Weather18°C (65°F)106 mm (4.2 inches)73%high
November Weather11°C (51°F)79 mm (3.1 inches)85%high
December Weather9°C (48°F)150 mm (5.9 inches)88%moderate

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