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April Weather in New Castle, United States

Last updated: June 24, 2025

In April, the average temperature in New Castle, United States hovers around 4°C (39°F). Expect chilly nights with minimum temperatures plunging to -14°C (7°F), while daytime highs can reach a mild 20°C (67°F). You'll also experience 48 mm (1.9 in) of precipitation over 9 days, accompanied by an average humidity level of 74%. Be prepared for a mix of comfort and coolness!

April Temperature in New Castle

In April in New Castle, the average temperature is 4°C (39°F). The maximum can reach 20°C (67°F) and the minimum can be as low as -14°C (7°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack appropriate layers for both mild and chilly conditions.

April Weather in New Castle: Daily Temperature Highs, Lows, and Averages

The chart illustrates April temperature patterns in New Castle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In New Castle, April typically has an average temperature of 4°C (39°F), with highs reaching up to 20°C (67°F) and lows dropping to around -14°C (7°F).
JanFebMarAprMayJunJulAugSepOctNovDec212533395063706860433121
Data source: Temperature data for New Castle 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.

April Precipitation in New Castle

In New Castle in April, the total precipitation amount is 48 mm (1.9 in) spread over 9 days.

April Precipitation Trends in New Castle

The chart displays monthly precipitation patterns in New Castle, 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 New Castle, April typically receives around 48 mm (1.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec557361484418131318604055
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in New Castle

In New Castle in April humidity is 74%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable and necessitating extra layers to stay warm while navigating the potentially slippery streets.

April Average Humidity in New Castle

This chart illustrates the average monthly humidity levels in New Castle, 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 New Castle is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%89%81%74%58%47%39%39%53%72%84%90%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in New Castle

In New Castle in April, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in New Castle.

Maximum UV Index Levels in New Castle for April

The chart shows the monthly maximum UV Index (UVI) for New Castle 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 New Castle typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469121213121210754
Data source: New Castle 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 New Castle Compares to Other Months

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

This table compares monthly weather conditions in New Castle, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)55 mm (2.2 inches)90%moderate
February Weather-4°C (25°F)73 mm (2.9 inches)89%high
March Weather1°C (33°F)61 mm (2.4 inches)81%very high
April Weather4°C (39°F)48 mm (1.9 inches)74%extreme
May Weather10°C (50°F)43 mm (1.7 inches)58%extreme
June Weather17°C (63°F)18 mm (0.7 inches)47%extreme
July Weather21°C (70°F)13 mm (0.5 inches)39%extreme
August Weather20°C (68°F)13 mm (0.5 inches)39%extreme
September Weather16°C (60°F)18 mm (0.7 inches)53%very high
October Weather6°C (43°F)60 mm (2.4 inches)72%high
November Weather0°C (32°F)39 mm (1.6 inches)84%moderate
December Weather-6°C (22°F)55 mm (2.2 inches)90%moderate

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