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December Weather in Casey, United States

Last updated: June 24, 2025

In Casey, United States, the average temperature in December hovers around 3°C (37°F). While the minimum can plunge to a brisk -19°C (-1°F), temperatures can rise to a pleasant 19°C (66°F). Expect a total precipitation of 78 mm (3.1 in) over approximately 9 days, and prepare for a high average humidity at 87%.

December Temperature in Casey

In December in Casey, the average temperature is 3°C (37°F). Maximums can reach 19°C (66°F) and minimums can be as low as -19°C (-1°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack layers for both warmth and comfort.

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

The chart illustrates December temperature patterns in Casey, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Casey, December typically has an average temperature of 3°C (37°F), with highs reaching up to 19°C (66°F) and lows dropping to around -19°C (-1°F).
JanFebMarAprMayJunJulAugSepOctNovDec313445546676797571594237
Data source: Temperature data for Casey 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 Casey

In Casey in December, the precipitation amount is 78 mm (3.1 in) over the course of 9 days.

December Precipitation Trends in Casey

The chart displays monthly precipitation patterns in Casey, 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 Casey, December typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec8490126116135108117108671059379
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Casey

In Casey in December, humidity is 87%. With an average temperature of 3°C (37°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and necessitating proper layers to stay warm while navigating the wet conditions.

December Average Humidity in Casey

This chart illustrates the average monthly humidity levels in Casey, 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 Casey is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Casey

In Casey 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 Casey, you can check the information here.

Maximum UV Index Levels in Casey for December

The chart shows the monthly maximum UV Index (UVI) for Casey 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 Casey typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
Data source: Casey 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 Casey Compares to Other Months

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

This table compares monthly weather conditions in Casey, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (31°F)84 mm (3.3 inches)84%moderate
February Weather1°C (35°F)90 mm (3.5 inches)82%moderate
March Weather7°C (45°F)126 mm (4.9 inches)84%high
April Weather12°C (54°F)116 mm (4.6 inches)83%very high
May Weather19°C (67°F)135 mm (5.3 inches)80%very high
June Weather24°C (76°F)108 mm (4.2 inches)83%extreme
July Weather26°C (79°F)117 mm (4.6 inches)82%very high
August Weather24°C (76°F)108 mm (4.3 inches)82%very high
September Weather22°C (72°F)67 mm (2.6 inches)79%very high
October Weather15°C (59°F)105 mm (4.1 inches)79%high
November Weather6°C (43°F)93 mm (3.7 inches)88%moderate
December Weather3°C (37°F)78 mm (3.1 inches)87%moderate

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