The best times to visit Keystone for ideal weather are

September 17th to December 2nd

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.

 

 


Other Keystone Travel Info

Weather in Keystone

Temperature

Average temperatures in Keystone vary drastically. Considering humidity, temperatures feel cold all year with a low chance of precipitation most of the year. The area is less temperate than some — in the 20th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Keystone, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally late June where highs are regularly around 73.5°F (23.1°C) with temperatures rarely dropping below 37.2°F (2.9°C) at night.

Keystone Temperatures (Fahrenheit)

Key
High
Average
Low

Keystone Temperatures (Celsius)

Key
High
Average
Low

“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Keystone Perceived Temperature (F)

Key
High
Average
Low

Keystone Perceived Temperature (C)

Key
High
Average
Low

 

Average Keystone Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 29.7 17 5.3
Feb 29.5 17.6 6.2
Mar 38.6 25.5 13.1
Apr 43.4 30.8 19.2
May 54.6 40 27.2
Jun 68.2 52.1 34.4
Jul 72.2 55.7 40
Aug 69.9 53.7 38.5
Sep 63.7 47.7 32.5
Oct 50.9 36.6 24.5
Nov 39.6 26.1 14.1
Dec 28.9 16.9 5.8

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan -1.3 -8.3 -14.8
Feb -1.4 -8 -14.3
Mar 3.7 -3.6 -10.5
Apr 6.3 -0.7 -7.1
May 12.6 4.4 -2.7
Jun 20.1 11.2 1.3
Jul 22.3 13.2 4.4
Aug 21.1 12.1 3.6
Sep 17.6 8.7 0.3
Oct 10.5 2.6 -4.2
Nov 4.2 -3.3 -9.9
Dec -1.7 -8.4 -14.6

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Keystone are June, November, and then October. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around late June. For example, on the week of June 25th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in early August with an average of 2 days of significant precipitation the week of July 30th.

When can you find snow in Keystone? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Keystone.

Key
Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Keystone (in).

Key
Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 15% 0 1.2
Feb 13% 0 1.2
Mar 15% 0 1.3
Apr 16% 0 1.6
May 13% 0 1.5
Jun 6% 0 0.6
Jul 20% 0 1.9
Aug 17% 0 1.8
Sep 14% 0 1.5
Oct 12% 0 1
Nov 12% 0 0.9
Dec 14% 0 1.3

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 15 0 3
Feb 13 0 3
Mar 15 0 3.3
Apr 16 0 4.1
May 13 0 3.8
Jun 6 0 1.5
Jul 20 0 4.8
Aug 17 0 4.6
Sep 14 0 3.8
Oct 12 0 2.5
Nov 12 0 2.3
Dec 14 0 3.3

 

Humidity and Wind

Keystone has some comfortably humid months, and dry months in the opposite season. The least humid month is June (27.1% relative humidity), and the most humid month is December (51.4%).

Wind in Keystone is usually calm. The windiest month is April, followed by February and January. April’s average wind speed of around 7 knots (8.1 MPH or 13 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in late May where average top sustained speeds reach 17.2 knots, which is considered a fresh breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Keystone.

Key
Avg. Relative Humidity

Wind

The graph below shows wind speed (max and average) in knots.

Key
Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 6.9 Light breeze 14.4 Significant breeze
Feb 6.9 Light breeze 15.1 Significant breeze
Mar 6.6 Light breeze 15 Significant breeze
Apr 7 Gentle breeze 16.2 Significant breeze
May 6.5 Light breeze 16 Significant breeze
Jun 6.2 Light breeze 15.9 Significant breeze
Jul 4.9 Light breeze 13.9 Significant breeze
Aug 4.8 Light breeze 13.4 Significant breeze
Sep 5 Light breeze 13.5 Significant breeze
Oct 6.3 Light breeze 14.6 Significant breeze
Nov 6.4 Light breeze 14.2 Significant breeze
Dec 6.4 Light breeze 13.9 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 47.5%
Feb 49.7%
Mar 41.1%
Apr 43.1%
May 42.2%
Jun 27.1%
Jul 43.3%
Aug 44.3%
Sep 40.4%
Oct 41%
Nov 39.8%
Dec 51.4%

 

Is it Safe to Travel to Keystone?

Our best data indicates this area is generally safe. As of Dec 04, 2023 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Dec 04, 2023.


 

The Busiest and Least Crowded Months

The busiest month for tourism in Keystone, CO, US is May, followed by July and June. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Keystone in December. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month

 

Most Popular Months to Visit

Key
Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is somewhat extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 44.1 in December means 44.1% of the tourists vs. May.

 

 

Overall Keystone Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel very cold. Highs range from 61.9°F (16.6°C) and 31.8°F (-0.1°C) with warmer temperatures in the later months. Rain is somewhat common with 4 to 5 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.

Summer (June through August)

The middle-year months have cold weather with high temperatures that are comfortable. These months see moderate precipitation with 2 to 6 days of precipitation per month. June – August is the busiest season for tourism in Keystone, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 66.3°F (19.1°C) and 35.2°F (1.8°C), which will feel chilly given the humidity and wind. It rains or snows a significant amount: approximately 4 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.

Winter (December through February)

Weather is far too cold this time of year in Keystone to be enjoyable for warm weather travelers. The average high during this season is between 31.8°F (-0.1°C) and 25.1°F (-3.8°C). On average, it rains or snows a fair amount: 4 to 5 times per month. These times of year are fairly slow with tourists.

 

Best Times to Travel› the United States › Keystone, CO, US