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December Weather in Effingham, United States

Last updated: June 24, 2025

In December, the average temperature in Effingham, United States hovers around 2°C (37°F). Expect a minimum chill of -19°C (-2°F) and the occasional warm day reaching 22°C (72°F). Prepare for 32 mm (1.2 in) of precipitation spread over 3 days, with an average humidity level of 84% to keep the air feeling crisp and cool.

December Temperature in Effingham

In December in Effingham, the average temperature is 2°C (37°F). Maximums can reach 22°C (72°F), and minimums can be as low as -19°C (-2°F). Travelers should be prepared for a wide range of temperatures, from chilly to pleasantly warm.

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

The chart illustrates December temperature patterns in Effingham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Effingham, December typically has an average temperature of 2°C (37°F), with highs reaching up to 22°C (72°F) and lows dropping to around -19°C (-2°F).
JanFebMarAprMayJunJulAugSepOctNovDec303145536577807671564336
Data source: Temperature data for Effingham 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 Effingham

In Effingham in December, the precipitation amount is 32 mm (1.2 in) over the course of 3 days.

December Precipitation Trends in Effingham

The chart displays monthly precipitation patterns in Effingham, 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 Effingham, December typically receives around 32 mm (1.2 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec4031948121711276119841173832
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Effingham

In Effingham in December, humidity is 84%. With an average temperature of 2°C (37°F), this humidity feels like an uncomfortable chill that seeps into your bones, making outdoor activities less enjoyable and prompting the need for layered clothing to stay warm and dry.

December Average Humidity in Effingham

This chart illustrates the average monthly humidity levels in Effingham, 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 Effingham is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%78%70%73%82%82%81%78%71%71%81%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Effingham

In Effingham 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 Effingham, you can check the information here.

Maximum UV Index Levels in Effingham for December

The chart shows the monthly maximum UV Index (UVI) for Effingham 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 Effingham typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
Data source: Effingham 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 Effingham Compares to Other Months

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

This table compares monthly weather conditions in Effingham, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)40 mm (1.6 inches)76%moderate
February Weather0°C (31°F)31 mm (1.2 inches)77%moderate
March Weather7°C (46°F)94 mm (3.7 inches)70%high
April Weather12°C (54°F)81 mm (3.2 inches)73%very high
May Weather18°C (65°F)217 mm (8.6 inches)82%very high
June Weather25°C (77°F)112 mm (4.4 inches)82%extreme
July Weather27°C (80°F)76 mm (3.0 inches)81%extreme
August Weather25°C (77°F)119 mm (4.7 inches)78%very high
September Weather22°C (72°F)83 mm (3.3 inches)71%very high
October Weather13°C (56°F)117 mm (4.6 inches)71%high
November Weather6°C (43°F)38 mm (1.5 inches)81%moderate
December Weather2°C (37°F)32 mm (1.2 inches)84%moderate

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