December Weather in Harmanli, Bulgaria

Last updated: August 22, 2025

In December, the average temperature in Harmanli, Bulgaria hovers around 6°C (42°F), with a minimum drop to -6°C (21°F) and a pleasant maximum of 19°C (66°F). Expect about 85 mm (3.3 in) of precipitation spread over 11 days, contributing to an average humidity level of 86%.

December Temperature in Harmanli

In December in Harmanli, the average temperature is 6°C (42°F), with maximums reaching up to 19°C (66°F) and minimums dipping as low as -6°C (21°F). It's essential to pack layers for your trip to stay comfortable in this varied climate.

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

The chart illustrates December temperature patterns in Harmanli, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harmanli, December typically has an average temperature of 6°C (42°F), with highs reaching up to 19°C (66°F) and lows dropping to around -6°C (21°F).

Data source: Temperature data for Harmanli generated using information from the Copernicus Climate Change Service.

December Precipitation in Harmanli

In Harmanli in December, the total precipitation amount is 85 mm (3.3 in) over a span of 11 days.

December Precipitation Trends in Harmanli

The chart displays monthly precipitation patterns in Harmanli, 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 Harmanli, December typically receives around 85 mm (3.3 inches) of precipitation spread over approximately 11 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Harmanli

In Harmanli in December, humidity is 86%. With an average temperature of 6°C (42°F), this humidity feels like a chilly, damp embrace that can make outdoor activities feel uncomfortable and chilly, prompting travelers to seek shelter or warm clothing to stay cozy while exploring.

December Average Humidity in Harmanli

This chart illustrates the average monthly humidity levels in Harmanli, 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 Harmanli is approximately 86%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Harmanli

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

Maximum UV Index Levels in Harmanli for December

The chart shows the monthly maximum UV Index (UVI) for Harmanli 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 Harmanli typically reaches 2, which falls under the low exposure category.

Data source: Harmanli 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 Harmanli Compares to Other Months

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

This table compares monthly weather conditions in Harmanli, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (37°F)	55 mm (2.2 inches)	87%	low
February Weather	5°C (42°F)	48 mm (1.9 inches)	84%	moderate
March Weather	8°C (46°F)	68 mm (2.7 inches)	81%	high
April Weather	12°C (55°F)	51 mm (2.0 inches)	72%	high
May Weather	18°C (65°F)	61 mm (2.4 inches)	74%	very high
June Weather	22°C (71°F)	108 mm (4.2 inches)	65%	very high
July Weather	25°C (77°F)	49 mm (1.9 inches)	59%	very high
August Weather	26°C (79°F)	17 mm (0.7 inches)	49%	very high
September Weather	21°C (71°F)	23 mm (0.9 inches)	57%	high
October Weather	15°C (59°F)	81 mm (3.2 inches)	76%	high
November Weather	10°C (50°F)	58 mm (2.3 inches)	84%	moderate
December Weather	6°C (42°F)	85 mm (3.3 inches)	86%	low