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April Weather in Sullivan, United States

Last updated: June 24, 2025

In Sullivan, United States, the average temperature in April hovers around 12°C (53°F), with extremes ranging from a chilly -6°C (22°F) to a warm 29°C (84°F). Expect about 125 mm (4.9 in) of precipitation over 11 days, accompanied by a notable average humidity of 83%. Be prepared for a mix of weather as you explore this vibrant destination!

April Temperature in Sullivan

In April in Sullivan, the average temperature is 12°C (53°F), with maxima reaching up to 29°C (84°F) and minima dipping as low as -6°C (22°F). This diverse temperature range means travelers should be prepared for both warm and chilly conditions during their trip.

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

The chart illustrates April temperature patterns in Sullivan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sullivan, April typically has an average temperature of 12°C (53°F), with highs reaching up to 29°C (84°F) and lows dropping to around -6°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec303344536675787471584237
Data source: Temperature data for Sullivan 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 Sullivan

In Sullivan in April, the precipitation amount is 125 mm (4.9 in) over the course of 11 days.

April Precipitation Trends in Sullivan

The chart displays monthly precipitation patterns in Sullivan, 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 Sullivan, April typically receives around 125 mm (4.9 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec7979127125138108116128691238964
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Sullivan

In Sullivan in April humidity is 83%. With an average temperature of 12°C (53°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and necessitating layers to stay comfortable while traveling.

April Average Humidity in Sullivan

This chart illustrates the average monthly humidity levels in Sullivan, 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 Sullivan is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Sullivan

In Sullivan in April, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Sullivan.

Maximum UV Index Levels in Sullivan for April

The chart shows the monthly maximum UV Index (UVI) for Sullivan 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 Sullivan typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
Data source: Sullivan 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 Sullivan Compares to Other Months

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

This table compares monthly weather conditions in Sullivan, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)79 mm (3.1 inches)84%moderate
February Weather0°C (33°F)79 mm (3.1 inches)82%moderate
March Weather7°C (44°F)127 mm (5.0 inches)84%high
April Weather12°C (53°F)125 mm (4.9 inches)83%very high
May Weather19°C (66°F)138 mm (5.4 inches)80%very high
June Weather24°C (76°F)108 mm (4.2 inches)83%extreme
July Weather25°C (78°F)116 mm (4.6 inches)82%very high
August Weather24°C (75°F)128 mm (5.0 inches)82%very high
September Weather22°C (71°F)69 mm (2.7 inches)79%very high
October Weather14°C (58°F)123 mm (4.8 inches)79%high
November Weather6°C (42°F)89 mm (3.5 inches)88%moderate
December Weather3°C (37°F)64 mm (2.5 inches)87%moderate

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