Keystone climate and temperatures

The climate of Keystone is a continental climate (Köppen: Dfb), with cold winters, warm summers, and precipitation spread throughout the year. Monthly temperatures range from a minimum of -4°C in winter (December–February) to a maximum of 18°C in summer (June–August). The average annual temperature is around 6°C.

During the winter months, nighttime temperatures can drop to an average of -12°C, while summer nights average around 8°C.

Climate table of Keystone

The climate table below gives you a clear overview of the climate in Keystone by month, from average temperatures and rainfall to UV levels. This makes it easy to see when the weather best suits your travel plans.

Best time to visit Keystone

The best time to visit Keystone is July. During this period, temperatures are usually pleasant to warm and there is relatively little rainfall. Especially in July, the climate is favorable, with an average high temperature of 18°C and around 40 mm of rainfall. For a city trip, round trip, or active holiday, July are often more comfortable, as it is warm without the heat becoming too intense. The warmest month is July, with an average daytime temperature of around 18°C. The driest month is January, with about 11 mm of rainfall, while August is usually the wettest month of the year, with approximately 44 mm. Snow is rare here, but may occasionally fall in January, February, March, September, November, December, April, May, June en October.

Average temperature per month

This chart shows the average daytime (maximum) and nighttime (minimum) temperatures per month in Keystone. The figures are based on climate data from recent years and are presented in degrees Celsius, so you can clearly see the temperature range for each month.

Average rainfall per month

This chart shows the average monthly rainfall in Keystone. The figures are based on long-term climate data and are displayed in millimeters, so you can immediately see which months are drier or wetter.

Average UV index per month

This chart shows the average monthly sun intensity in Keystone. The UV index ranges from 0 (no UV radiation) to 11+ (extreme). A higher UV index means you can burn more quickly, making proper sun protection increasingly important.

Average annual temperature

This chart shows the average annual temperature in Keystone based on data from the past ten years. It allows you to see at a glance how the climate is evolving and whether there are clear warming trends.

Average annual rainfall

This chart shows the average annual rainfall in Keystone over the past ten years. It allows you to see at a glance how much rain falls each year and whether there are clear fluctuations between the years.

Weather experiences in Keystone

The weather in Keystone is rated an average of 4.3 out of 5 stars by 8 visitors. Have you been to Keystone? Share your experience with the weather to help other visitors plan their trip.

Average weather per month

Click on a month below and discover what the weather in Keystone is typically like. For each period, you can instantly see the average temperature, rainfall, wind, and UV index. Thanks to years of historical weather data, you’ll know exactly what to expect during your trip.

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November
• December