Fall Weather in Perry Park Colorado, United States
Daily high temperatures decrease by 32°F, from 77°F to 45°F, rarely falling below 30°F or exceeding 85°F.
Daily low temperatures decrease by 29°F, from 52°F to 24°F, rarely falling below 11°F or exceeding 58°F.
For reference, on July 10, the hottest day of the year, temperatures in Perry Park typically range from 56°F to 82°F, while on December 30, the coldest day of the year, they range from 19°F to 41°F.
Average High and Low Temperature in the Fall in Perry Park
The figure below shows you a compact characterization of the hourly average fall temperatures. 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.
Average Hourly Temperature in the Fall in Perry Park
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The fall in Perry Park experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 32% to 41%. The lowest chance of overcast or mostly cloudy conditions is 25% on September 29.
The clearest day of the fall is September 29, with clear, mostly clear, or partly cloudy conditions 75% of the time.
For reference, on May 7, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 46%, while on September 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 75%.
Cloud Cover Categories in the Fall in Perry Park
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Perry Park, the chance of a wet day over the course of the fall is very rapidly decreasing, starting the season at 23% and ending it at 7%.
For reference, the year's highest daily chance of a wet day is 35% on August 8, and its lowest chance is 4% on January 9.
Over the course of the fall in Perry Park, the chance of a day with only rain decreases from 23% to 1%, the chance of a day with mixed snow and rain remains an essentially constant 2% throughout, and the chance of a day with only snow increases from 0% to 4%.
Probability of Precipitation in the Fall in Perry Park
To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during the fall in Perry Park is rapidly decreasing, starting the season at 1.2 inches, when it rarely exceeds 2.2 inches or falls below 0.4 inches, and ending the season at 0.1 inches, when it rarely exceeds 0.2 inches or falls below -0.0 inches.
Average Monthly Rainfall in the Fall in Perry Park
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during the fall in Perry Park is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.8 inches or falling below -0.0 inches.
The highest average 31-day liquid-equivalent accumulation is 0.3 inches on November 14.
Average Monthly Liquid-Equivalent Snowfall in the Fall in Perry Park
Over the course of the fall in Perry Park, the length of the day is very rapidly decreasing. From the start to the end of the season, the length of the day decreases by 3 hours, 24 minutes, implying an average daily decrease of 2 minutes, 16 seconds, and weekly decrease of 15 minutes, 50 seconds.
The shortest day of the fall is November 30, with 9 hours, 38 minutes of daylight and the longest day is September 1, with 13 hours, 1 minute of daylight.
Hours of Daylight and Twilight in the Fall in Perry Park
The earliest sunrise of the fall in Perry Park is 6:28 AM on September 1 and the latest sunrise is 1 hour, 5 minutes later at 7:33 AM on November 6.
The latest sunset is 7:30 PM on September 1 and the earliest sunset is 2 hours, 53 minutes earlier at 4:37 PM on November 30.
Daylight saving time (DST) ends at 1:00 AM on November 7, 2021, shifting sunrise and sunset to be an hour earlier.
For reference, on June 21, the longest day of the year, the Sun rises at 5:33 AM and sets 14 hours, 56 minutes later, at 8:29 PM, while on December 21, the shortest day of the year, it rises at 7:16 AM and sets 9 hours, 24 minutes later, at 4:40 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in the Fall in Perry Park
The figure below presents a compact representation of key lunar data for the fall of 2021. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. 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.
Moon Rise, Set & Phases in the Fall in Perry Park
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The chance that a given day will be muggy in Perry Park is essentially constant during the fall, remaining around 0% throughout.
Humidity Comfort Levels in the Fall in Perry Park
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Perry Park is increasing during the fall, increasing from 7.2 miles per hour to 9.0 miles per hour over the course of the season.
For reference, on April 1, the windiest day of the year, the daily average wind speed is 10.1 miles per hour, while on August 14, the calmest day of the year, the daily average wind speed is 7.0 miles per hour.
Average Wind Speed in the Fall in Perry Park
The hourly average wind direction in Perry Park throughout the fall is predominantly from the west, with a peak proportion of 60% on November 30.
Wind Direction in the Fall in Perry Park
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 (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
The growing season in Perry Park typically lasts for 4.7 months (145 days), from around May 9 to around October 1, rarely starting before April 22 or after May 27, and rarely ending before September 12 or after October 20.
During the fall in Perry Park, the chance that a given day is within the growing season is very rapidly decreasing falling from 99% to 0% over the course of the season.
Time Spent in Various Temperature Bands and the Growing Season in the Fall in Perry Park
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
The average accumulated growing degree days in Perry Park are rapidly increasing during the fall, increasing by 472°F, from 1,826°F to 2,299°F, over the course of the season.
Growing Degree Days in the Fall in Perry Park
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. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy in Perry Park is very rapidly decreasing during the fall, falling by 3.4 kWh, from 6.1 kWh to 2.7 kWh, over the course of the season.
Average Daily Incident Shortwave Solar Energy in the Fall in Perry Park
For the purposes of this report, the geographical coordinates of Perry Park are 39.257 deg latitude, -104.992 deg longitude, and 6,467 ft elevation.
The topography within 2 miles of Perry Park contains large variations in elevation, with a maximum elevation change of 2,165 feet and an average elevation above sea level of 6,867 feet. Within 10 miles contains large variations in elevation (3,812 feet). Within 50 miles also contains extreme variations in elevation (9,180 feet).
The area within 2 miles of Perry Park is covered by trees (50%), grassland (36%), and shrubs (14%), within 10 miles by trees (57%) and grassland (31%), and within 50 miles by grassland (42%) and trees (30%).
This report illustrates the typical weather in Perry Park, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Perry Park.
For each station, the records are corrected for the elevation difference between that station and Perry Park according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Perry Park is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Perry Park and a given station.
The stations contributing to this reconstruction are: Elbert Mountain, Monument Pass (KMNH, 34%, 31 kilometers, east); United States Air Force Academy Airstrip (KAFF, 34%, 36 kilometers, southeast); Arapahoe County Airport (KAPA, 28%, 37 kilometers, north); and Wilkerson Pass (K4BM, 3.8%, 51 kilometers, southwest).
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.
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 . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for airports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.