© 2020 AccuWeather, Inc. "AccuWeather" and sun design are registered trademarks of AccuWeather, Inc. All Rights Reserved. The percentage of time spent at various humidity comfort levels, categorized by dew point. This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. For reference, on 4 March, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 48%, while on 18 September, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 73%. Mostly Cloudy then Slight Chance Snow. Average Weather on September 23 in Keystone Colorado, United States. All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . Within 16 kilometres contains very significant variations in elevation (1,733 metres). In addition to snow history, you can also view the mountain's Base Depth by selecting it from the dropdown. Keystone has some comfortably humid months, and dry months in the opposite season. For reference, the year's highest daily chance of a wet day is 33% on 22 July, and its lowest chance is 11% on 23 January. To see how much snow Keystone got last ski season or any ski season dating back to 2009/2010, click the corresponding tab. 5°F-15°C. When will the polar vortex send Arctic air? MERRA-2 Modern-Era Retrospective Analysis. The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands. Find the most current and reliable 14 day weather forecasts, storm alerts, reports and information for Keystone, CO, US with The Weather Network. All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus. If your plans change, your lift ticket is refundable . The lowest average daily incident shortwave solar energy during December is 2.5 kWh on 22 December. Find what to do today, this weekend, or in January. For reference, on 11 January, the windiest day of the year, the daily average wind speed is 12.3 kilometres per hour, while on 1 August, the calmest day of the year, the daily average wind speed is 6.2 kilometres per hour. Low. The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. Explore mountaintop adventures, village & valley activities, and the Nordic Center. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day. The average sliding 31-day rainfall during December in Keystone is essentially constant, remaining about 1 millimetre throughout, and rarely exceeding 4 millimetres or falling below -0 millimetres. 1 in 1 cm. Feb. 24°F-4°C. What's the weather forecast for Keystone this week? From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night. Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 0°C) in the year (the calendar year in the Northern Hemisphere, or from 1 July until 30 June in the Southern Hemisphere). Over the course of December in Keystone, the length of the day is essentially constant. Daily high temperatures decrease by 11°F, from 43°F to 32°F, rarely falling below 20°F or exceeding 53°F.. Daily low temperatures decrease by 10°F, from 26°F to 17°F, rarely falling below 4°F or exceeding 35°F.. For reference, on July 15, the hottest day of the year, temperatures in Keystone typically range … Precip. Leadville averages 141.3 inches of snow per year. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon. The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day). Get the 14 day trend, long range weather forecast for Keystone, CO, US At Keystone, skiing and snowboarding is just the beginning. Monday. Visit top-rated & … For reference, on 15 July, the hottest day of the year, temperatures in Keystone typically range from 9°C to 21°C, while on 28 January, the coldest day of the year, they range from -11°C to -3°C. The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than. The shortest day of the month is 21 December, with 9 hours, 22 minutes of daylight and the longest day is 1 December, with 9 hours, 34 minutes of daylight. There are 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Keystone. The solar day over the course of December. Keystone hosts numerous festivals and free concerts throughout the winter. The month of December in Keystone experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 42% throughout the month. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds. The least humid month is June (27.1% relative humidity), and the most humid month is December (51.4%). Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory. Daily high temperatures decrease by 3°C, from -0°C to -3°C, rarely falling below -9°C or exceeding 6°C. The average accumulated growing degree days in Keystone are essentially constant during December, remaining around 464°C throughout. Percentage of time keystone colorado weather december in each cloud Cover band, categorized by dew point in,... 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