April Weather in Keystone, United States

Last updated: June 24, 2025

In April, the average temperature in Keystone, United States hovers around 9°C (48°F), with a striking range that can drop to a chilly -11°C (13°F) or soar to a warm 29°C (84°F). Expect about 85 mm (3.3 in) of precipitation spread over 11 days, contributing to an average humidity level of 82%. Prepare for a mix of conditions that characterizes this intriguing month!

April Temperature in Keystone

In April in Keystone, the average temperature is 9°C (48°F), with maximums reaching 29°C (84°F) and minimums dipping as low as -11°C (13°F). Be prepared for a wide range of temperatures when traveling to Keystone during this month.

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

The chart illustrates April temperature patterns in Keystone, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Keystone, April typically has an average temperature of 9°C (48°F), with highs reaching up to 29°C (84°F) and lows dropping to around -11°C (13°F).

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

April Precipitation in Keystone

In Keystone in April, the total precipitation amount is 85 mm (3.3 in) over a span of 11 days.

April Precipitation Trends in Keystone

The chart displays monthly precipitation patterns in Keystone, 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 Keystone, April typically receives around 85 mm (3.3 inches) of precipitation spread over approximately 11 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

April Humidity in Keystone

In Keystone in April, humidity is 82%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill that seeps into your bones, making it essential to dress in layers for your travels while keeping an umbrella handy for unexpected drizzles.

April Average Humidity in Keystone

This chart illustrates the average monthly humidity levels in Keystone, 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 Keystone is approximately 82%, 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 Keystone

In Keystone 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 Keystone.

Maximum UV Index Levels in Keystone for April

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

Data source: Keystone 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 Keystone Compares to Other Months

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

This table compares monthly weather conditions in Keystone, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	45 mm (1.8 inches)	81%	moderate
February Weather	-5°C (23°F)	52 mm (2.1 inches)	81%	moderate
March Weather	3°C (38°F)	73 mm (2.9 inches)	81%	high
April Weather	9°C (48°F)	85 mm (3.3 inches)	82%	very high
May Weather	16°C (62°F)	162 mm (6.4 inches)	78%	very high
June Weather	23°C (73°F)	143 mm (5.6 inches)	81%	extreme
July Weather	24°C (76°F)	91 mm (3.6 inches)	79%	very high
August Weather	22°C (72°F)	64 mm (2.5 inches)	77%	very high
September Weather	20°C (67°F)	121 mm (4.8 inches)	78%	very high
October Weather	11°C (52°F)	143 mm (5.6 inches)	78%	high
November Weather	3°C (38°F)	45 mm (1.8 inches)	87%	moderate
December Weather	-1°C (30°F)	40 mm (1.6 inches)	84%	moderate