April Weather in Hackettstown, United States

Last updated: June 24, 2025

In April, the average temperature in Hackettstown, United States is a cool 11°C (51°F). Temperatures can range from a chilly -3°C (27°F) at their lowest to a warm 29°C (85°F) at their peak. Prepare for some rainfall, as the area receives approximately 109 mm (4.3 in) over 12 days, and keep in mind the average humidity is around 78%.

April Temperature in Hackettstown

In April in Hackettstown, the average temperature is 11°C (51°F), with maximums reaching up to 29°C (85°F) and minimums dropping as low as -3°C (27°F). This makes it advisable to pack layers to prepare for varying weather conditions during your travels.

April Weather in Hackettstown: Daily Temperature Highs, Lows, and Averages

The chart illustrates April temperature patterns in Hackettstown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hackettstown, April typically has an average temperature of 11°C (51°F), with highs reaching up to 29°C (85°F) and lows dropping to around -3°C (27°F).

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

April Precipitation in Hackettstown

In Hackettstown in April, the total precipitation amount is 109 mm (4.3 in) during a span of 12 days.

April Precipitation Trends in Hackettstown

The chart displays monthly precipitation patterns in Hackettstown, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Hackettstown, April typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 12 days.

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

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Millimeters (mm) Inches (in)

April Humidity in Hackettstown

In Hackettstown in April, humidity is 78%. With an average temperature of 11°C (51°F), this humidity feels like a damp chill that lingers in the air, making outdoor activities less inviting and leading to a persistent sense of coolness that can be invigorating yet uncomfortable for travelers.

April Average Humidity in Hackettstown

This chart illustrates the average monthly humidity levels in Hackettstown, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Hackettstown is approximately 78%, offering insight into how humid the weather typically is during this month.

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

April UV Index in Hackettstown

In Hackettstown in April, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Hackettstown.

Maximum UV Index Levels in Hackettstown for April

The chart shows the monthly maximum UV Index (UVI) for Hackettstown in April, 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 April, the maximum UV index in Hackettstown typically reaches 8, which falls under the very high exposure category.

Data source: Hackettstown April 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 April Weather in Hackettstown Compares to Other Months

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

This table compares monthly weather conditions in Hackettstown, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (32°F)	71 mm (2.8 inches)	84%	moderate
February Weather	2°C (35°F)	103 mm (4.1 inches)	82%	moderate
March Weather	5°C (41°F)	102 mm (4.0 inches)	81%	high
April Weather	11°C (51°F)	109 mm (4.3 inches)	78%	very high
May Weather	16°C (61°F)	133 mm (5.3 inches)	69%	very high
June Weather	21°C (71°F)	102 mm (4.0 inches)	69%	very high
July Weather	25°C (77°F)	134 mm (5.3 inches)	62%	very high
August Weather	23°C (74°F)	138 mm (5.4 inches)	65%	very high
September Weather	20°C (68°F)	102 mm (4.0 inches)	68%	very high
October Weather	14°C (58°F)	134 mm (5.3 inches)	74%	high
November Weather	6°C (44°F)	87 mm (3.4 inches)	82%	moderate
December Weather	2°C (36°F)	109 mm (4.3 inches)	80%	low