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December Weather in Sultan, United States

Last updated: June 24, 2025

In December, the average temperature in Sultan, United States hovers around 2°C (36°F), with extremes reaching a frigid -13°C (9°F) at the low end and a mild 12°C (54°F) at the high. Expect 300 mm (11.8 in) of precipitation over the course of 20 days, contributing to the region's average humidity of 88%.

December Temperature in Sultan

In December in Sultan, the average temperature is 2°C (36°F). Maximum temperatures can reach 12°C (54°F), while minimums can drop as low as -13°C (9°F). Be prepared for chilly weather and pack accordingly if you're planning to visit!

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

The chart illustrates December temperature patterns in Sultan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sultan, December typically has an average temperature of 2°C (36°F), with highs reaching up to 12°C (54°F) and lows dropping to around -13°C (9°F).
JanFebMarAprMayJunJulAugSepOctNovDec363439455257616256464136
Data source: Temperature data for Sultan 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 Sultan

In Sultan in December, the precipitation amount is 300 mm (11.8 in) over a span of 20 days.

December Precipitation Trends in Sultan

The chart displays monthly precipitation patterns in Sultan, 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 Sultan, December typically receives around 300 mm (11.8 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec2613032021821121024030136261301300
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Sultan

In Sultan in December, humidity is 88%. With an average temperature of 2°C (36°F), this humidity feels like a cold, damp blanket wrapping around you, making traveling uncomfortable and energy-draining as every step through the chill seems heavier in the thick air.

December Average Humidity in Sultan

This chart illustrates the average monthly humidity levels in Sultan, 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 Sultan is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%87%84%81%82%79%63%62%83%89%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sultan

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

Maximum UV Index Levels in Sultan for December

The chart shows the monthly maximum UV Index (UVI) for Sultan 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 Sultan typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec236799997532
Data source: Sultan 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 Sultan Compares to Other Months

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

This table compares monthly weather conditions in Sultan, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)261 mm (10.3 inches)86%low
February Weather1°C (34°F)303 mm (11.9 inches)86%moderate
March Weather4°C (39°F)202 mm (7.9 inches)87%high
April Weather7°C (45°F)182 mm (7.2 inches)84%high
May Weather11°C (52°F)112 mm (4.4 inches)81%very high
June Weather14°C (57°F)102 mm (4.0 inches)82%very high
July Weather16°C (62°F)40 mm (1.6 inches)79%very high
August Weather17°C (62°F)30 mm (1.2 inches)63%very high
September Weather14°C (57°F)136 mm (5.4 inches)62%high
October Weather8°C (46°F)261 mm (10.3 inches)83%moderate
November Weather5°C (41°F)301 mm (11.8 inches)89%moderate
December Weather2°C (36°F)300 mm (11.8 inches)88%low

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