December Weather in Semnan, Iran

Last updated: August 23, 2025

In December, the average temperature in Semnan, Iran is a cool 6°C (43°F). Temperatures can dip as low as -4°C (25°F), while reaching a maximum of 17°C (64°F). Expect 11 mm (0.4 in) of precipitation over approximately 3 days and an average humidity level of 65%, creating a refreshing atmosphere throughout the month.

December Temperature in Semnan

In December in Semnan, the average temperature is 6°C (43°F). The maximum can reach 17°C (64°F), and the minimum can be as low as -4°C (25°F). Be prepared for a range of temperatures, making it a great time for layers when traveling.

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

The chart illustrates December temperature patterns in Semnan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Semnan, December typically has an average temperature of 6°C (43°F), with highs reaching up to 17°C (64°F) and lows dropping to around -4°C (25°F).

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

December Precipitation in Semnan

In Semnan in December, the precipitation amount is 11 mm (0.4 in) over the course of 3 days.

December Precipitation Trends in Semnan

The chart displays monthly precipitation patterns in Semnan, 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 Semnan, December typically receives around 11 mm (0.4 inches) of precipitation spread over approximately 3 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 Semnan

In Semnan in December, humidity is 65%. With an average temperature of 6°C (43°F), this humidity feels like a chilly fog wrapping around you, making it essential to dress warmly while exploring the sights.

December Average Humidity in Semnan

This chart illustrates the average monthly humidity levels in Semnan, 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 Semnan is approximately 65%, 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 Semnan

In Semnan 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 Semnan for better planning.

Maximum UV Index Levels in Semnan for December

The chart shows the monthly maximum UV Index (UVI) for Semnan 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 Semnan typically reaches 4, which falls under the moderate exposure category.

Data source: Semnan 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 Semnan Compares to Other Months

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

This table compares monthly weather conditions in Semnan, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (39°F)	11 mm (0.4 inches)	63%	moderate
February Weather	6°C (44°F)	21 mm (0.8 inches)	62%	moderate
March Weather	12°C (53°F)	21 mm (0.8 inches)	63%	very high
April Weather	17°C (63°F)	17 mm (0.7 inches)	57%	very high
May Weather	22°C (72°F)	12 mm (0.5 inches)	57%	extreme
June Weather	29°C (84°F)	1 mm (0.0 inches)	47%	extreme
July Weather	31°C (88°F)	0 mm (0.0 inches)	34%	extreme
August Weather	29°C (84°F)	1 mm (0.0 inches)	28%	extreme
September Weather	25°C (77°F)	2 mm (0.1 inches)	33%	very high
October Weather	17°C (63°F)	8 mm (0.3 inches)	51%	high
November Weather	10°C (50°F)	19 mm (0.8 inches)	66%	moderate
December Weather	6°C (43°F)	11 mm (0.4 inches)	65%	moderate