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December Weather in Flagstaff, South Africa

Last updated: August 31, 2025

In Flagstaff, South Africa, the average temperature in December hovers around 19°C (67°F). However, expect a range where the minimum dips to 8°C (47°F) and the maximum soars to 36°C (97°F). During this month, precipitation amounts reach 120 mm (4.7 in) over approximately 20 days, contributing to an average humidity level of 88%.

December Temperature in Flagstaff

In December in Flagstaff, the average temperature is 19°C (67°F). Maximums can reach 36°C (97°F), while minimums can drop as low as 8°C (47°F). Be sure to pack accordingly, as temperatures can vary significantly throughout the day.

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

The chart illustrates December temperature patterns in Flagstaff, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Flagstaff, December typically has an average temperature of 19°C (67°F), with highs reaching up to 36°C (97°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec697068635956555761636467
Data source: Temperature data for Flagstaff 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 Flagstaff

In Flagstaff in December, the total precipitation amount is 120 mm (4.7 in) spread over 20 days.

December Precipitation Trends in Flagstaff

The chart displays monthly precipitation patterns in Flagstaff, 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 Flagstaff, December typically receives around 120 mm (4.7 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec106131968933236384184102120
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Flagstaff

In Flagstaff in December, humidity is 88%. With an average temperature of 19°C (67°F), this humidity feels like a heavy blanket enveloping you, making travel feel sticky and exhausting as you navigate through the sweltering air.

December Average Humidity in Flagstaff

This chart illustrates the average monthly humidity levels in Flagstaff, 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 Flagstaff is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%89%89%88%82%77%72%82%83%88%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Flagstaff

In Flagstaff in December, the maximum UV index is 16, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, making it crucial to take protective measures. For detailed information, you can refer to the Hourly UV Index in Flagstaff.

Maximum UV Index Levels in Flagstaff for December

The chart shows the monthly maximum UV Index (UVI) for Flagstaff 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 Flagstaff typically reaches 16, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec1514129645710121316
Data source: Flagstaff 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 Flagstaff Compares to Other Months

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

This table compares monthly weather conditions in Flagstaff, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather21°C (70°F)106 mm (4.2 inches)88%extreme
February Weather21°C (70°F)131 mm (5.2 inches)88%extreme
March Weather20°C (68°F)96 mm (3.8 inches)89%extreme
April Weather17°C (64°F)89 mm (3.5 inches)89%very high
May Weather15°C (60°F)33 mm (1.3 inches)88%high
June Weather13°C (56°F)23 mm (0.9 inches)82%moderate
July Weather13°C (56°F)6 mm (0.2 inches)77%moderate
August Weather14°C (57°F)37 mm (1.5 inches)72%high
September Weather16°C (61°F)41 mm (1.6 inches)82%very high
October Weather17°C (63°F)84 mm (3.3 inches)83%extreme
November Weather18°C (64°F)102 mm (4.0 inches)87%extreme
December Weather19°C (67°F)120 mm (4.7 inches)88%extreme

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