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December Weather in Fountain Hills, United States

Last updated: June 24, 2025

In December, the average temperature in Fountain Hills, United States is a comfortable 12°C (54°F), but be prepared for a range as it can dip to a brisk -1°C (31°F) or rise to a warm 28°C (82°F). Expect about 27 mm (1.0 in) of precipitation over 4 days, and with an average humidity of 82%, you'll want to dress accordingly for this humid climate!

December Temperature in Fountain Hills

In December in Fountain Hills, the average temperature is 12°C (54°F). Maximum temperatures can reach 28°C (82°F), while minimums can drop to as low as -1°C (31°F). Be sure to pack for both warm and cool weather during your travels.

December Weather in Fountain Hills: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Fountain Hills, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fountain Hills, December typically has an average temperature of 12°C (54°F), with highs reaching up to 28°C (82°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec535663738191949388746454
Data source: Temperature data for Fountain Hills 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 Fountain Hills

In Fountain Hills in December, the precipitation amount is 27 mm (1.0 in) over the course of 4 days.

December Precipitation Trends in Fountain Hills

The chart displays monthly precipitation patterns in Fountain Hills, 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 Fountain Hills, December typically receives around 27 mm (1.0 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec334431222383328252327
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Fountain Hills

In Fountain Hills in December humidity is 82%. With an average temperature of 12°C (54°F), this humidity feels like a heavy blanket wrapping around you, making every step feel sluggish and sweat-inducing, which can be quite uncomfortable for traveling.

December Average Humidity in Fountain Hills

This chart illustrates the average monthly humidity levels in Fountain Hills, 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 Fountain Hills is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%79%67%55%40%33%34%48%64%67%77%82%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Fountain Hills

In Fountain Hills 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 Fountain Hills for better planning.

Maximum UV Index Levels in Fountain Hills for December

The chart shows the monthly maximum UV Index (UVI) for Fountain Hills 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 Fountain Hills typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101112111110854
Data source: Fountain Hills 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 Fountain Hills Compares to Other Months

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

This table compares monthly weather conditions in Fountain Hills, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (53°F)33 mm (1.3 inches)76%moderate
February Weather13°C (56°F)44 mm (1.7 inches)79%high
March Weather17°C (63°F)31 mm (1.2 inches)67%very high
April Weather23°C (74°F)2 mm (0.1 inches)55%very high
May Weather27°C (81°F)2 mm (0.1 inches)40%extreme
June Weather33°C (92°F)2 mm (0.1 inches)33%extreme
July Weather34°C (94°F)38 mm (1.5 inches)34%extreme
August Weather34°C (93°F)33 mm (1.3 inches)48%extreme
September Weather31°C (88°F)28 mm (1.1 inches)64%very high
October Weather24°C (75°F)25 mm (1.0 inches)67%very high
November Weather18°C (65°F)23 mm (0.9 inches)77%moderate
December Weather12°C (54°F)27 mm (1.0 inches)82%moderate

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