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December Weather in Karaj, Iran

Last updated: August 23, 2025

In December, the average temperature in Karaj, Iran hovers around 4°C (39°F). Expect a chilly minimum of -9°C (16°F) and a milder maximum of 17°C (62°F). With 33 mm (1.3 in) of precipitation over about 6 days, the average humidity sits at a comfortable 70%.

December Temperature in Karaj

In December in Karaj, the average temperature is 4°C (39°F). Maximums can reach 17°C (62°F), while minimums can drop as low as -9°C (16°F). Be prepared for a blend of chilly and mild weather if you're planning to visit during this time.

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

The chart illustrates December temperature patterns in Karaj, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Karaj, December typically has an average temperature of 4°C (39°F), with highs reaching up to 17°C (62°F) and lows dropping to around -9°C (16°F).
JanFebMarAprMayJunJulAugSepOctNovDec353747576880858275614639
Data source: Temperature data for Karaj 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 Karaj

In Karaj, in December, the precipitation amount is 33 mm (1.3 in) over the course of 6 days.

December Precipitation Trends in Karaj

The chart displays monthly precipitation patterns in Karaj, 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 Karaj, December typically receives around 33 mm (1.3 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec34564954244301203933
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Karaj

In Karaj in December humidity is 70%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill enveloping you, making every step outside feel heavier and more pressing, as though the air is thick with moisture, which can quickly lead to an uncomfortable cold if not layered properly for travel.

December Average Humidity in Karaj

This chart illustrates the average monthly humidity levels in Karaj, 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 Karaj is approximately 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec70%66%68%62%64%62%52%40%45%61%72%70%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Karaj

In Karaj 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 Karaj, you can check the information here.

Maximum UV Index Levels in Karaj for December

The chart shows the monthly maximum UV Index (UVI) for Karaj 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 Karaj typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec45891212111010743
Data source: Karaj 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 Karaj Compares to Other Months

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

This table compares monthly weather conditions in Karaj, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (35°F)34 mm (1.3 inches)70%moderate
February Weather3°C (38°F)56 mm (2.2 inches)66%moderate
March Weather8°C (47°F)49 mm (1.9 inches)68%very high
April Weather14°C (57°F)54 mm (2.1 inches)62%very high
May Weather20°C (68°F)24 mm (1.0 inches)64%extreme
June Weather27°C (80°F)4 mm (0.1 inches)62%extreme
July Weather29°C (85°F)2 mm (0.1 inches)52%extreme
August Weather28°C (82°F)0 mm (0.0 inches)40%very high
September Weather24°C (75°F)1 mm (0.0 inches)45%very high
October Weather16°C (61°F)20 mm (0.8 inches)61%high
November Weather8°C (47°F)39 mm (1.5 inches)72%moderate
December Weather4°C (39°F)33 mm (1.3 inches)70%moderate

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