January Weather in Greencastle, United States

Last updated: June 24, 2025

In January, the average temperature in Greencastle, United States hovers around 1°C (34°F). During this time, you might experience chilly lows of -18°C (0°F) and occasional highs reaching 20°C (68°F). Prepare for 62 mm (2.4 in) of precipitation over approximately 8 days, contributing to a relatively high average humidity of 86%.

January Temperature in Greencastle

In January in Greencastle, the average temperature is 1°C (34°F). Maximums can reach 20°C (68°F) and minimums can be as low as -18°C (0°F). This wide temperature range means that travelers should be prepared for both chilly days and potentially warmer afternoons, making layered clothing a smart choice for exploring the area.

January Weather in Greencastle: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Greencastle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Greencastle, January typically has an average temperature of 1°C (34°F), with highs reaching up to 20°C (68°F) and lows dropping to around -18°C (0°F).

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

January Precipitation in Greencastle

In Greencastle in January, the precipitation amount is 62 mm (2.4 in) over the course of 8 days.

January Precipitation Trends in Greencastle

The chart displays monthly precipitation patterns in Greencastle, 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 Greencastle, January typically receives around 62 mm (2.4 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 Greencastle

In Greencastle in January, humidity is 86%. With an average temperature of 1°C (34°F), this humidity feels like a chilling embrace, making outdoor adventures brisk and invigorating but challenging for travel.

January Average Humidity in Greencastle

This chart illustrates the average monthly humidity levels in Greencastle, 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 Greencastle is approximately 86%, 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 Greencastle

In Greencastle in January, 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 Greencastle, you can check the information here.

Maximum UV Index Levels in Greencastle for January

The chart shows the monthly maximum UV Index (UVI) for Greencastle 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 Greencastle typically reaches 3, which falls under the moderate exposure category.

Data source: Greencastle 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 Greencastle Compares to Other Months

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

This table compares monthly weather conditions in Greencastle, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	1°C (34°F)	62 mm (2.4 inches)	86%	moderate
February Weather	3°C (38°F)	94 mm (3.7 inches)	86%	moderate
March Weather	6°C (44°F)	88 mm (3.5 inches)	86%	high
April Weather	12°C (54°F)	101 mm (4.0 inches)	84%	very high
May Weather	18°C (64°F)	118 mm (4.7 inches)	78%	very high
June Weather	23°C (73°F)	90 mm (3.5 inches)	79%	very high
July Weather	26°C (79°F)	124 mm (4.9 inches)	70%	very high
August Weather	24°C (76°F)	87 mm (3.4 inches)	59%	very high
September Weather	21°C (70°F)	110 mm (4.3 inches)	68%	very high
October Weather	15°C (60°F)	104 mm (4.1 inches)	80%	high
November Weather	7°C (45°F)	81 mm (3.2 inches)	86%	moderate
December Weather	3°C (38°F)	95 mm (3.7 inches)	85%	moderate