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April Weather in Johnstown, United States

Last updated: June 24, 2025

In April, the average temperature in Johnstown, United States hovers around 11°C (51°F), with extremes ranging from a chilly -6°C (22°F) to a warm 28°C (83°F). Expect 125 mm (4.9 in) of precipitation spread over 13 days, and don’t forget to factor in the high average humidity of 87%—perfect for a cozy indoor retreat!

April Temperature in Johnstown

In April in Johnstown, the average temperature is 11°C (51°F). Maximum temperatures can reach as high as 28°C (83°F), while the minimum can drop to as low as -6°C (22°F). This varied climate makes Johnstown a destination where travelers should pack for both warm days and chilly nights.

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

The chart illustrates April temperature patterns in Johnstown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Johnstown, April typically has an average temperature of 11°C (51°F), with highs reaching up to 28°C (83°F) and lows dropping to around -6°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec303341516371757368574136
Data source: Temperature data for Johnstown 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 Johnstown

In Johnstown in April, the total precipitation amount is 125 mm (4.9 in), occurring over a span of 13 days.

April Precipitation Trends in Johnstown

The chart displays monthly precipitation patterns in Johnstown, 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 Johnstown, April typically receives around 125 mm (4.9 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec861101111251291511147688102100104
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Johnstown

In Johnstown in April humidity is 87%. With an average temperature of 11°C (51°F), this humidity feels like a damp chill wrapping around you, making outdoor excursions a bit uncomfortable as the air feels thick and heavy, urging you to seek shelter more often than not.

April Average Humidity in Johnstown

This chart illustrates the average monthly humidity levels in Johnstown, 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 Johnstown is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%87%88%81%82%81%78%78%82%89%86%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Johnstown

In Johnstown 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 Johnstown.

Maximum UV Index Levels in Johnstown for April

The chart shows the monthly maximum UV Index (UVI) for Johnstown 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 Johnstown typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Johnstown 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 Johnstown Compares to Other Months

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

This table compares monthly weather conditions in Johnstown, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)86 mm (3.4 inches)88%moderate
February Weather1°C (34°F)110 mm (4.3 inches)87%moderate
March Weather5°C (42°F)111 mm (4.4 inches)87%high
April Weather11°C (51°F)125 mm (4.9 inches)87%very high
May Weather17°C (63°F)129 mm (5.1 inches)81%very high
June Weather22°C (71°F)151 mm (5.9 inches)82%very high
July Weather24°C (75°F)114 mm (4.5 inches)81%very high
August Weather23°C (73°F)76 mm (3.0 inches)78%very high
September Weather20°C (68°F)88 mm (3.4 inches)78%very high
October Weather14°C (57°F)102 mm (4.0 inches)82%high
November Weather5°C (41°F)100 mm (3.9 inches)89%moderate
December Weather2°C (36°F)104 mm (4.1 inches)86%low

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