January Weather in Half Moon, United States

Last updated: June 24, 2025

In January, the average temperature in Half Moon, United States hovers around 8°C (47°F). Expect a chilly minimum of -11°C (12°F), while the mercury can rise to a pleasant 26°C (78°F). During this month, you'll likely experience 73 mm (2.9 in) of precipitation spread over 8 days, contributing to an average humidity of 85%.

January Temperature in Half Moon

In January in Half Moon, the average temperature is 8°C (47°F). Maximums can reach 26°C (78°F), and minimums can drop to as low as -11°C (12°F). Be prepared for a wide range of temperatures and pack accordingly for your travels!

January Weather in Half Moon: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Half Moon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Half Moon, January typically has an average temperature of 8°C (47°F), with highs reaching up to 26°C (78°F) and lows dropping to around -11°C (12°F).

Data source: Temperature data for Half Moon generated using information from the Copernicus Climate Change Service.

January Precipitation in Half Moon

In Half Moon in January, the precipitation amount is 73 mm (2.9 in) over a span of 8 days.

January Precipitation Trends in Half Moon

The chart displays monthly precipitation patterns in Half Moon, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Half Moon, January typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in Half Moon

In Half Moon in January humidity is 85%. With an average temperature of 8°C (47°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor activities feel less refreshing and more uncomfortable for traveling.

January Average Humidity in Half Moon

This chart illustrates the average monthly humidity levels in Half Moon, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Half Moon is approximately 85%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Half Moon

In Half Moon in January, 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 Half Moon for better planning.

Maximum UV Index Levels in Half Moon for January

The chart shows the monthly maximum UV Index (UVI) for Half Moon in January, 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 January, the maximum UV index in Half Moon typically reaches 4, which falls under the moderate exposure category.

Data source: Half Moon January 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 January Weather in Half Moon Compares to Other Months

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

This table compares monthly weather conditions in Half Moon, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (47°F)	73 mm (2.9 inches)	85%	moderate
February Weather	11°C (52°F)	98 mm (3.8 inches)	82%	high
March Weather	13°C (55°F)	67 mm (2.6 inches)	81%	very high
April Weather	17°C (63°F)	114 mm (4.5 inches)	80%	very high
May Weather	22°C (72°F)	122 mm (4.8 inches)	81%	extreme
June Weather	25°C (77°F)	191 mm (7.5 inches)	81%	extreme
July Weather	27°C (80°F)	176 mm (6.9 inches)	81%	extreme
August Weather	26°C (79°F)	215 mm (8.5 inches)	80%	very high
September Weather	24°C (76°F)	224 mm (8.8 inches)	79%	very high
October Weather	20°C (68°F)	69 mm (2.7 inches)	80%	very high
November Weather	13°C (55°F)	110 mm (4.3 inches)	85%	high
December Weather	10°C (50°F)	116 mm (4.6 inches)	86%	moderate